TOHOKU UNIVERSITY Researchers - Hideaki Kobayashi

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Hideaki Kobayashi

Section

Institute of Fluid Science

Job title

Professor

Degree

工学博士（東北大学）

researchmap

https://researchmap.jp/read0168561

J-GLOBAL ID

200901048598713333

Committee Memberships 19

国立研究開発法人産業技術総合研究所　クロスアポイントメントフェロー

2015/04 - 2023/03
一般社団法人日本機械学会　日本機械学会東北支部長

2021/03 - 2022/03
The Combustion Institute (国際燃焼学会)　理事, 副会長

2008/09 - 2020/07
東北大学流体科学研究所　副所長

2016/04 - 2019/03
内閣府戦略的イノベーション創造プログラム(SIP)「エネルギーキャリア」　アンモニア直接燃焼チームリーダー

2015/04 - 2019/03
一般社団法人日本燃焼学会　理事, 副会長, 会長

2000/01 - 2017/06
一般社団法人日本航空宇宙学会　北部支部長

2016/03 - 2017/03
一般社団法人日本機械学会　熱工学部門長

2013/04 - 2014/03
一般社団法人日本機械学会　評議員

2009/04 - 2011/03
一般社団法人日本機械学会　熱工学部門総務委員

2006/04 - 2010/03
一般社団法人日本機械学会　Journal of Thermal Science and Technology エディター

2005/11 - 2009/11
第32回国際燃焼シンポジウム（モントリオール）　プログラム委員長

2006/08 - 2008/08
日本機械学会　評議員

2006/04 - 2007/03
日本機械学会東北支部　幹事会委員

2005/04 - 2007/03
日本機械学会熱工学部門　運営委員

2005/04 - 2007/03
日本機械学会東北支部　幹事会委員

2005/04 - 2007/03
日本機械学会熱工学部門　運営委員

2005/04 - 2007/03
日本機械学会東北支部　商議員

2003/04 - 2007/03
日本航空宇宙学会北部支部　庶務幹事

1998/03 - 2000/02

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Professional Memberships 6

The Combustion Institute (国際燃焼学会）

1984/07 - Present
日本熱物性学会
流れの可視化情報学会
日本航空宇宙学会
日本燃焼学会
日本機械学会

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Research Interests 4

Ammonia Combustion
Environment
Aerospace
Combustion

Research Areas 2

Aerospace, marine, and maritime Engineering / Aerospace engineering / Aerospace Engineering
Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Thermal engineering / Thermal Engineering

Awards 18

The Bernard Lewis Gold Medal

2022/07　The Combustion Institute (国際燃焼学会）
日本ガスタービン学会賞（技術賞）

2022/04　公益財団法人日本ガスタービン学会　低NOxアンモニア専焼マイクロガスタービン発電の研究・開発
谷川熱技術賞

2021/09　公益財団法人谷川熱技術振興基金
論文賞

2020/12　一般社団法人日本燃焼学会　詳細反応機構を用いたアンモニア/天然ガス混焼ガスタービン燃焼器の低NOx燃焼法に関する検討，日本燃焼学会誌，Vol.61, No.198, (2019), pp.368-375.
論文賞

2020/12　一般社団法人日本燃焼学会　Development of a wide range-operable, rich-lean low-NOx combustor for NH3 fuel gas-turbine power generation, Proceedings of the Combustion Institute, Vol. 37. (2019), pp.4587-4595.
論文賞

2019/11　一般社団法人日本燃焼学会　Science and Technology of Ammonia Combustion, Proceedings of the Combustion Institute Vol. 37 (2019) pp.109-133.
日本航空宇宙学会フェロー

2019/04　一般社団法人日本航空宇宙学会
熱工学部門講演論文表彰

2018/10　一般社団法人日本機械学会　Effects of pressure on Combustion Characteristics of Ammonia/Air Premixed Turbulent Flames in Swirling Flows
Fellow of The Combustion Institute

2018/06　The Combustion Institute (国際燃焼学会）
流体科学研究賞

2017/11　一般財団法人機器研究会　極限環境条件における反応性流体科学現象の解明に関する研究
熱工学部門研究功績賞

2017/04　一般社団法人日本機械学会
平成29年度科学技術分野の文部科学大臣表彰科学技術賞研究部門

2017/04　文部科学省　極限環境条件における燃焼現象解明の研究
熱工学部門講演論文表彰

2010/03　一般社団法人日本機械学会　高圧下変動速度場における液滴燃焼速度定数増大のメカニズムについて
日本機械学会フェロー

2008/04　一般社団法人日本機械学会
日本機械学会第85期熱工学部門業績賞

2008/03　一般社団法人日本機械学会　熱工学分野の研究
日本機械学会賞 (論文賞)

2006/04　日本機械学会　Effects of Turbulence on Flame Structure and NOx Emission of Turbulent Jet Non-premixed Flames in High-Temperature Air Combustion, JSME International Journal Ser. B, (2005), pp.286-292
日本航空宇宙学会論文賞

1998/04　日本航空宇宙学会　衝撃波入射によるストラット後流の保炎に対する噴射燃料予混合化の影響, 日本航空宇宙学会誌, 第45巻 (1997), 36-45 頁
日本燃焼学会奨励賞

1996/11　日本燃焼学会　高圧乱流燃焼現象に関する研究

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Papers 241

Achieving high flame stability with low NO And Zero N2O and NH3 emissions during liquid ammonia spray combustion with gas turbine combustors

Ekenechukwu C. Okafor, Osamu Kurata, Hirofumi Yamashita, Norihiko Iki, Takahiro Inoue, Hyun Jo, Masayasu Shimura, Taku Tsujimura, Akihiro Hayakawa, Hideaki Kobayashi

Proceedings of the Combustion Institute　2024/11

DOI： 10.1016/j.proci.2024.105340 　

ISSN： 1540-7489
Visualization of liquid ammonia spray using 2p-SLIPI and comparison of liquid ammonia spray and gaseous ammonia combustion in a swirl combustor at atmospheric pressure Peer-reviewed

Hirofumi Yamashita, Akihiro Hayakawa, Kohei Oku, Sophie Colson, Gauthier Reibel, Yi-rong Chen, K. D. Kunkuma A. Somarathne, Ekenechukwu C. Okafor, Taku Tsujimura, Shintaro Ito, Masahiro Uchida, Taku Kudo, Hideaki Kobayashi

Fuel　371　131833　2024/09

DOI： 10.1016/j.fuel.2024.131833 　
Enhancement of liquid ammonia combustion by a twin fluid atomizer

Osamu Kurata, Okafor Ekenechukwu Chijioke, Hirofumi Yamashita, Takahiro Inoue, Taku Tsujimura, Norihiko Iki, Akihiro Hayakawa, Hideaki Kobayashi

International Journal of Gas Turbine, Propulsion and Power Systems　2024/07

DOI： 10.38036/jgpp.15.4_v15n4tp02 　

ISSN： 1882-5079
Optimum primary equivalence ratio for rich-lean two-stage combustion of non-premixed ammonia/methane/air and ammonia/hydrogen/air flames in a swirling flow

Hirofumi Yamashita, Akihiro Hayakawa, Ekenechukwu C. Okafor, Sophie Colson, K. D. Kunkuma A. Somarathne, Taku Tsujimura, Shintaro Ito, Masahiro Uchida, Taku Kudo, Hideaki Kobayashi

Fuel　368　131598-131598　2024/07
Publisher: Elsevier BV
DOI： 10.1016/j.fuel.2024.131598 　

ISSN： 0016-2361
Emission characteristics of confined non-premixed ammonia–oxygen–nitrogen turbulent jet flames under oxygen-enriched conditions

Yu Xia, Yuxuan Shen, Kodai Sakai, Daichi Matsumoto, Sophie Colson, Taku Kudo, Akihiro Hayakawa, Hideaki Kobayashi

Proceedings of the Combustion Institute　40　(1-4)　105704-105704　2024
Publisher: Elsevier BV
DOI： 10.1016/j.proci.2024.105704 　

ISSN： 1540-7489
Towards the development of liquid ammonia/air spray combustion in a gas turbine-like combustor at moderately high pressure

Kapuruge Don Kunkuma Amila Somarathne, Hirofumi Yamashita, Sophie Colson, Kohei Oku, Keito Honda, Ekenechukwu Chijioke Okafor, Akihiro Hayakawa, Taku Kudo, Hideaki Kobayashi

Applications in Energy and Combustion Science　16　100215-100215　2023/12
Publisher: Elsevier BV
DOI： 10.1016/j.jaecs.2023.100215 　

ISSN： 2666-352X
Study on the effect of injection temperature and nozzle geometry on the flashing transition of liquid ammonia spray

Sophie Colson, Hirofumi Yamashita, Kohei Oku, Kapuruge Don Kunkuma Amila Somarathne, Taku Kudo, Akihiro Hayakawa, Hideaki Kobayashi

Fuel　348　128612-128612　2023/09
Publisher: Elsevier BV
DOI： 10.1016/j.fuel.2023.128612 　

ISSN： 0016-2361
Numerical and experimental study of product gas characteristics in premixed ammonia/methane/air laminar flames stabilised in a stagnation flow

Marina Kovaleva, Akihiro Hayakawa, Sophie Colson, Ekenechukwu C. Okafor, Taku Kudo, Agustin Valera-Medina, Hideaki Kobayashi

Fuel Communications　10　100054-100054　2022/03
Publisher: Elsevier BV
DOI： 10.1016/j.jfueco.2022.100054 　

ISSN： 2666-0520
Effects of initial mixture temperature and pressure on laminar burning velocity and Markstein length of ammonia/air premixed laminar flames

Ryuhei Kanoshima, Akihiro Hayakawa, Takahiro Kudo, Ekenechukwu C. Okafor, Sophie Colson, Akinori Ichikawa, Taku Kudo, Hideaki Kobayashi

Fuel　310　2022/02/15

DOI： 10.1016/j.fuel.2021.122149 　

ISSN： 0016-2361
Measurement of the laminar burning velocity and kinetics study of the importance of the hydrogen recovery mechanism of ammonia/hydrogen/air premixed flames

Gabriel J. Gotama, Akihiro Hayakawa, Ekenechukwu C. Okafor, Ryuhei Kanoshima, Masao Hayashi, Taku Kudo, Hideaki Kobayashi

Combustion and Flame　236　111753-111753　2022/02
Publisher: Elsevier BV
DOI： 10.1016/j.combustflame.2021.111753 　

ISSN： 0010-2180
Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Yasuhiro HIGUCHI, Yoshio NUNOME, Satoshi TAKADA, Ryoma YOSHIKAWA, Taku KUDO, Akihiro HAYAKAWA, Hideaki KOBAYASHI

Journal of Thermal Science and Technology　17　(3)　22-00216　2022
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jtst.22-00216 　

eISSN： 1880-5566
Stabilization mechanisms of an ammonia/methane non-premixed jet flame up to liftoff Peer-reviewed

Sophie Colson, Manuel Kuhni, Akihiro Hayakawa, Hideaki Kobayashi, Cédric Galizzi, Dany Escudié

Combustion and Flame　234　111657-111657　2021/12
Publisher: Elsevier BV
DOI： 10.1016/j.combustflame.2021.111657 　

ISSN： 0010-2180

eISSN： 1556-2921
Liquid ammonia spray combustion in two-stage micro gas turbine combustors at 0.25 MPa; Relevance of combustion enhancement to flame stability and NOx control Peer-reviewed

Ekenechukwu C. Okafor, Osamu Kurata, Hirofumi Yamashita, Takahiro Inoue, Taku Tsujimura, Norihiko Iki, Akihiro Hayakawa, Shintaro Ito, Masahiro Uchida, Hideaki Kobayashi

Applications in Energy and Combustion Science　7　100038-100038　2021/06
Publisher: Elsevier BV
DOI： 10.1016/j.jaecs.2021.100038 　

ISSN： 2666-352X
The effects of steam addition on the unstable behavior of hydrogen-air lean premixed flames under the adiabatic and non-adiabatic conditions Peer-reviewed

Taisei FURUYAMA, Thwe Thwe Aung, Toshiyuki KATSUMI, Hideaki KOBAYASHI, Satoshi KADOWAKI

Transactions of the JSME (in Japanese)　87　(898)　21-00107　2021/05
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/transjsme.21-00107 　

eISSN： 2187-9761
Effects of pressure and heat loss on the unstable motion of cellular-flame fronts caused by intrinsic instability in hydrogen-air lean premixed flames Peer-reviewed

S. Kadowaki, T. T. Aung, T. Furuyama, K. Kawata, T. Katsumi, H. Kobayashi

Journal of Thermal Science and Technology　16　(2)　JTST0021-JTST0021　2021/02
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jtst.2021jtst0021 　

eISSN： 1880-5566
Start-up process of 50KW-Class gas turbine firing ammonia gas

Osamu Kurata, Norihiko Iki, Yong Fan, Takayuki Matsunuma, Takahiro Inoue, Taku Tsujimura, Hirohide Furutani, Masato Kawano, Keisuke Arai, Ekenechukwu C. Okafor, Akihiro Hayakawa, Hideaki Kobayashi

Proceedings of the ASME Turbo Expo　6　2021

DOI： 10.1115/GT2021-59448 　
Flame stability and emissions characteristics of liquid ammonia spray co-fired with methane in a single stage swirl combustor Peer-reviewed

Ekenechukwu C. Okafor, Hirofumi Yamashita, Akihiro Hayakawa, K.D. Kunkuma A. Somarathne, Taku Kudo, Taku Tsujimura, Masahiro Uchida, Shintaro Ito, Hideaki Kobayashi

Fuel　287　119433-119433　2020/10
Publisher: Elsevier BV
DOI： 10.1016/j.fuel.2020.119433 　

ISSN： 0016-2361
Turbulent flame propagation limits of ammonia/methane/air premixed mixture in a constant volume vessel Peer-reviewed

Genya Hashimoto, Khalid Hadi, Yu Xia, Aainaa Hamid, Nozomu Hashimoto, Akihiro Hayakawa, Hideaki Kobayashi, Osamu Fujita

Proceedings of the Combustion Institute　38　(4)　5171-5180　2020/10
Publisher: Elsevier BV
DOI： 10.1016/j.proci.2020.08.055 　

ISSN： 1540-7489
Study of the Combined Effect of Ammonia Addition and Air Coflow Velocity on a Non-Premixed Methane Jet Flame Stabilization Peer-reviewed

S. Colson, M. Kuhni, C. Galizzi, D. Escudie, H. Kobayashi

Combustion Science and Technology　2020/10
Effects of OH concentration and temperature on NO emission characteristics of turbulent non-premixed CH4/NH3/air flames in a two-stage gas turbine like combustor at high pressure Peer-reviewed

Kapuruge Don Kunkuma Amila Somarathne, Ekenechukwu C. Okafor, Daiki Sugawara, Akihiro Hayakawa, Hideaki Kobayashi

Proceedings of the Combustion Institute　38　(4)　5163-5170　2020/09
Publisher: Elsevier BV
DOI： 10.1016/j.proci.2020.06.276 　

ISSN： 1540-7489
Experimental and numerical study of product gas characteristics of ammonia/air premixed laminar flames stabilized in a stagnation flow

Akihiro Hayakawa, Yuta Hirano, Ekenechukwu C. Okafor, Hirofumi Yamashita, Taku Kudo, Hideaki Kobayashi

Proceedings of the Combustion Institute　38　(2)　2409-2417　2020/08
Publisher: Elsevier BV
DOI： 10.1016/j.proci.2020.07.030 　

ISSN： 1540-7489
Influence of wall heat loss on the emission characteristics of premixed ammonia-air swirling flames interacting with the combustor wall

Ekenechukwu C. Okafor, Masaaki Tsukamoto, Akihiro Hayakawa, K.D. Kunkuma A. Somarathne, Taku Kudo, Taku Tsujimura, Hideaki Kobayashi

Proceedings of the Combustion Institute　38　(4)　5139-5146　2020/08
Publisher: Elsevier BV
DOI： 10.1016/j.proci.2020.06.142 　

ISSN： 1540-7489
Combustion Characteristics of a Cavity Flameholder with a Burned-Gas Injector at the Cavity Bottom Wall in a Scramjet Model Combustor Peer-reviewed

T. Yamaguchi, T. Hizawa, Y. Yugami, M. Hasegawa, T. Kudo, A. Hayakawa, H.Kobayashi

Transactions of the Japan Society for Aeronautical and Space Sciences　63　(4)　160-171　2020/07/04
Publisher: Japan Society for Aeronautical and Space Sciences
DOI： 10.2322/tjsass.63.160 　

ISSN： 0549-3811

eISSN： 2189-4205
Experimental and Numerical Study of NH3/CH4 Counterflow Premixed and Non-Premixed Flames for Various NH3 Mixing Ratios Peer-reviewed

S. Colson, Y. Hirano, A. Hayakawa, T. Kudo, H. Kobayashi, C. Galizzi, D. Escudie

Combustion Science and Technology　193　(16)　2872-2889　2020/05
Publisher: Informa UK Limited
DOI： 10.1080/00102202.2020.1763326 　

ISSN： 0010-2202

eISSN： 1563-521X
Novel Dilution Sampling Method for Gas Analysis with a Low Sampling Rate Peer-reviewed

A, Hayakawa, Y. Hirano, A. Ichikawa, K. Matsuo, T. Kudo, H. Kobayashi

Mechanical Engineering Journal　7　(2)　19-00193　2020/04/15
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/mej.19-00193 　

eISSN： 2187-9745
水素-空気希薄予混合火炎の不安定挙動（未燃ガス温度、熱損失およびスケールの効果） Peer-reviewed

門脇敏, 内山努, 勝身俊之, トエトエアウン, 小林秀昭

日本機械学会論文集　86　(883)　2020/03/25
Flow Field and Combustion Field Control Using Pylons Installed Upstream of a Cavity in Supersonic Flow Peer-reviewed

T. Hizawa, T. Yamaguchi, K. Murata, Y. Yugami, M. Hasegawa, A. Hayakawa, H. Kobayashi

The Japan Society for Aeronautical and Space Sciences　63　(2)　2020/03/04
Turbulent burning velocity of ammonia/oxygen/nitrogen premixed flame in O2-enriched air condition Peer-reviewed

Yu Xia, Genya Hashimoto, Khalid Hadi, Nozomu Hashimoto, Akihiro Hayakawa, Hideaki Kobayashi, Osamu Fujita

Fuel　268　117383-117383　2020/03
Publisher: Elsevier {BV}
DOI： 10.1016/j.fuel.2020.117383 　
Experimental Study of Turbulent Flame Propagation Limits of NH3/CH4/air Premixed Gas in A Constant Volume Combustion Chamber

Hashimoto Genya, Hadi Khalid, Xia Yu, Hamid Aainaa, Hashimoto Nozomu, Hayakawa Akihiro, Kobayashi Hideaki, Fujita Osamu

The Proceedings of the Thermal Engineering Conference　2020　80-80　2020
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeted.2020.0080 　

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In this study, the flame propagation experiments of ammonia/methane/air were conducted using a fan-stirred constant volume vessel in order to clarify the effect of turbulence on the propagation limits of the ammonia/methane/air. Results show that the ammonia/methane/air mixture with a 0.9 equivalence ratio can propagate at the highest turbulence intensity and flames can propagate in larger turbulence Karlovitz number at smaller Markstein number. These tendencies are considered to be due to the diffusional-thermal instability of the flame surface.
Performance Prediction by Cycle Simulation for Ammonia / Natural Gas Co-Fired Gas Turbine Peer-reviewed

48　(1)　2020/01
Control of NOx and Other Emissions in Micro Gas Turbine Combustors Fuelled with Mixtures of methane and Ammonia Peer-reviewed

E.C. Okafor, K.D.K.A. Somarathne, R. Ratthanan, A. Hayakawa, T. Kudo, O. Kurata, N. Iki, T. Tsujimura, H. Furutani, H. Kobayashi

Combustion and Flame　211　406-416　2020/01

DOI： 10.1016/j.combustflame.2019.10.012 　

ISSN： 0010-2180

eISSN： 1556-2921
アンモニア燃焼研究の意義とインパクト

小林秀昭, 早川晃弘

日本燃焼学会誌　61　(198)　277-282　2019/11
流体力学的不安定性と拡散・熱的不安定性に起因する三次元セル状予混合火炎（未燃ガス温度と熱損失の効果） Peer-reviewed

門脇敏, 野上雅人, トエトエアウン, 勝身俊之, 山崎渉, 小林秀昭

日本機械学会論文集　85　(879)　2019/10
Emission Characteristics of a Lean-Premixed Ammonia/Natural-Gas Gas-Turbine Combustor and Effect of Secondary Ammonia Injection Peer-reviewed

S. Ito, M. Uchida, S. Kato, T. Fujimori, H. Kobayashi

Mechanical Engineering Journal　6　(5)　2019/09
詳細反応機構を用いたアンモニア/天然ガス混焼ガスタービン燃焼器の低NOｘ燃焼方法に関する検討 Peer-reviewed

伊藤慎太朗, 内田正弘, 藤森俊郎, 小林秀昭

日本燃焼学会誌　61　(198)　368-375　2019/09
Emission Characteristics of Turbulent Non-Premixed Ammonia/Air and methane/Air Swirl Flames Through a Rich-lean Combustor Under Various Wall Thermal Boundary Conditions at High Pressure Peer-reviewed

K.D.K.A. Somarathne, E.C. Okafor, A. Hayakawa, T. Kudo, O. Kurata, N. Iki, H. Kobayashi

Combustion and Flame　210　247-261　2019/09

DOI： 10.1016/j.combustflame.2019.08.037 　

ISSN： 0010-2180

eISSN： 1556-2921
OH Planar Laser-Induced Fluorescence Measurement for H2/O2 Jet Diffusion Flames in Rocket Combustion Condition up to 7.0MPa Peer-reviewed

Y. Higuchi, K. Takeuchi, Y. Nunome, S. Tomioka, K. Sakaki T. Kudo, A. Hayakawa, H. Kobayashi

Journal of Thermal Science and Technology　14　(2)　JTST0018-JTST0018　2019/07
Publisher: The Japan Society of Mechanical Engineers and The Heat Transfer Society of Japan
DOI： 10.1299/jtst.2019jtst0018 　

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This study focuses on the application of OH planar laser-induced fluorescence (OH-PLIF) in high-pressure rocket combustion conditions, up to 7.0 MPa. The signal to noise ratio of PLIF degrades in high-pressure combustion owing to effects such as line broadening and interference from intense chemiluminescence. The OH(2,0) band excitation method was applied to obtain the OH(2,1) fluorescence emitted near 290 nm and filter out the intense OH(0,0) band chemiluminescence emitted near 308 nm. The gaseous H₂/O₂ (GH₂/GO₂) jet diffusion flame was formed using a recessed coaxial shear injector. The GH₂/GO₂ injection Reynolds number, Re (Re_H2/Re_O2 ≈ 2320/22800–4660/45600), was varied to examine the variation of the flame structure and reaction zone thickness under each pressure condition P_c, and Re injection condition. In addition, the variation of the experimentally derived full width at half maximum (FWHM) of the radial OH distribution, δ_OH, with the Damköehler number, Da, was compared with that of the simulated FWHM of the OH mole fraction, δ_OH-SIM. The OH distribution was clearly observed in the instantaneous PLIF image while eliminating the intense OH chemiluminescence even in the highest pressure condition of 7.0 MPa, which is a pressure higher than any of the previous OH-PLIF studies conducted on rocket combustion. The flame structure showed the typical characteristics of a turbulent jet diffusion flame and depended on Re rather than on the chamber pressure P_c. The variation of δ_OH with Da corresponded qualitatively with δ_OH-SIM and showed the characteristics of flame stretch in the vicinity of the injector.
アンモニア直接燃焼 Peer-reviewed

小林秀昭, 早川晃弘

水素エネルギーシステム　44　(2)　105-113　2019/06
Measurement and Modelling of the Laminar Burning Velocity of Methane-Ammonia –Air Flames at High Pressures Using a Reduced Reaction Mechanism Peer-reviewed

E.C. Okafor, Y. Naito, S. Colson, A. Ichikawa, T. Kudo, A. Hayakawa, H. Kobayashi

Combustion and Flame　204　162-175　2019/03

ISSN： 0010-2180
Science and Technology of Ammonia Combustion Peer-reviewed

H. Kobayashi, A. Hayakawa, K.D.K.A. Somarathne, E.C. Okafor

Proceedings of the Combustion Institute　37　109-133　2019/03
Development of a Wide Range-Operable, Rich-Lean Low-NOx Combustor for NH3 Fuel Gas-Turbine Power Generation Peer-reviewed

O. Kurata, N. Iki, T. Inoue, T. Matsunuma, T. Tsujimura, H. Furutani, M. Kawano, K. Arai, E.C. Okafor, A. Hayakawa, H. Kobayashi

Proceedings of the Combustion Institute　37　(4)　4587-4595　2019/03

DOI： 10.1016/j.proci.2018.09.012 　

ISSN： 1540-7489

eISSN： 1873-2704
Quantitative Measurement of Temperature in Oxygen Enriched CH4/O2/N2 Premixed Flames Using Laser Induced Thermal Grating Spectroscopy (LITGS) Up to 1.0MPa Peer-reviewed

A. Hayakawa, T. Yamagami, K. Takeuchi, Y. Higuchi, T. Kudo, S. Lowe, Y. Gao, S. Hochgreb, H, Kobayashi

Proceedings of the Combustion Institute　37　1427-1434　2019/03
Towards the Development of an Efficient Low-NOx Ammonia Combustor for a Mio Gas Turbine Peer-reviewed

E.C. Okafor, K.D.K.A. Somarathne, A. Hayakawa, T Kudo, O. Kurata, N. Iki, H. Kobayashi

Proceedings of the Combustion Institute　37　4597-4606　2019/03
Extinction Limits of an Ammonia/Air Flame Propagating in a Turbulent Field Peer-reviewed

R. Ichimura, K. Hadi, N. Hashimoto, A. Hayakawa, H. Kobayashi

Fuel　246　178-186　2019/02
Burning Velocity and Flame Structure of CH4/NH3/Air Turbulent Premixed Flames at High Pressure Peer-reviewed

A. Ichikawa, Y. Naito, A. Hayakawa, T. Kudo, H. Kobayashi

International Journal of Hydrogen Energy　44　6991-6999　2019/02
The scale effects on the dynamic behavior of hydrogen-air lean premixed flames under the adiabatic and non-adiabatic conditions

Satoshi Kadowaki, Tsutomu Uchiyama, Toshiyuki Katsumi, Hideaki Kobayashi

12th Asia-Pacific Conference on Combustion, ASPACC 2019　2019
Publisher: Combustion Institute
Investigation of effective fuel injection systems for scramjet model combustor with double pylon

Yasuto Yugami, Tomohiro Hizawa, Tatsuya Yamaguchi, Mariko Hasegawa, Akihiro Hayakawa, Taku Kudo, Hideaki Kobayashi

12th Asia-Pacific Conference on Combustion, ASPACC 2019　2019
Publisher: Combustion Institute
Performance improvement of a cavity flameholder by pylon installation in supersonic flow

Mariko Hasegawa, Tomohiro Hizawa, Tatsuya Yamaguchi, Yasuto Yugami, Taku Kudo, Akihiro Hayakawa, Hideaki Kobayashi

12th Asia-Pacific Conference on Combustion, ASPACC 2019　2019
Publisher: Combustion Institute
Flame propagation limit of premixed gas of ammonia and methane in turbulent fields in a constant volume vessel

Genya Hashimoto, Ryo Ichimura, Khalid Hadi, Yu Xia, Nozomu Hashimoto, Akihiro Hayakawa, Hideaki Kobayashi, Osamu Fujita

The Proceedings of the National Symposium on Power and Energy Systems　2019.24　D124-D124　2019
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jsmepes.2019.24.d124 　

eISSN： 2424-2950
Emission Characteristics of Turbulent Non-premixed CH4/NH3/air Swirl Flames through a Rich-Lean Gas Turbine-like Combustor at High Pressure

K. D.K.A. Somarathne, E. C. Okafor, A. Hayakawa, H. Kobayashi

12th Asia-Pacific Conference on Combustion, ASPACC 2019　2019
Product gas characteristics of strain stabilized ammonia/air premixed laminar flames

Akihiro Hayakawa, Yuta Hirano, Ekenechukwu C. Okafor, Taku Kudo, Hideaki Kobayashi

12th Asia-Pacific Conference on Combustion, ASPACC 2019　2019
Three-dimensional cellular premixed flames generated by hydrodynamic and diffusive-thermal instabilities (Effects of unburned-gas temperature and heat loss)

Satoshi KADOWAKI, Masato NOGAMI, Thwe Thwe Aung, Toshiyuki KATSUMI, Wataru YAMAZAKI, Hideaki KOBAYASHI

Transactions of the JSME (in Japanese)　85　(879)　19-00274　2019
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/transjsme.19-00274 　

eISSN： 2187-9761
On the control of NOx emission from a micro gas turbine combustor fueled with mixtures of methane and ammonia

Ekenechukwu C. Okafor, Rattanasupapornsak Ratthanan, K. A.D, Kunkuma Somarathne, Akihiro Hayakawa, Taku Kudo, Osamu Kurata, Norihiko Iki, Taku Tsujimura, Hideaki Kobayashi

12th Asia-Pacific Conference on Combustion, ASPACC 2019　2019/01/01
Development and Verification of a Supersonic nozzle with a Rectangular Cross Section at a Mach Number of 2.8 for a Scramjet Model Combustor Peer-reviewed

T. Yamaguchi, T. Hizawa, T. Ichikawa, T.Kudo, A. Hayakawa, H. Kobayashi

Journal of Thermal Science and Technology　13　(2)　2018/11
Total temperature estimation of a hydrogen/air burned-gas torch igniter for a scramjet combustor Peer-reviewed

T. Yamaguchi, T. Hizawa, T. Ichikawa, T.Kudo, A. Hayakawa, H. Kobyashi

Journal of Thermal Science and Technology,　13　(2)　2018/10
Modeling of ammonia/air non-premixed turbulent swirling flames in a gas turbine-like combustor at various pressures Peer-reviewed

K.D.K.A. Somarathne, S. Colson, A. Hayakawa, H. Kobayashi

Combustion Theory and Modelling,　22　(5)　973-997　2018/06
Numerical calculations of the dynamic behavior of hydrogen-air lean premixed flames due to intrinsic instability based on the detailed chemical reaction model

S. Kadowaki, R. Ohki, Thwe Thwe Aung, T. Katsumi, H. Kobayashi

10th International Conference on Computational Fluid Dynamics, ICCFD 2018 - Proceedings　2018
Publisher: International Conference on Computational Fluid Dynamics 2018
NOx Reduction in a Swirl Combustor Firing Ammonia for a Micro Gas Turbine Peer-reviewed

Norihiko Iki, Osamu Kurata, Takayuki Matsunuma, Takahiro Inoue, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Akihiro Hayakawa, Ekenechukwu Okafor

ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition　2018

DOI： 10.1115/GT2018-75993 　
Development of a water-cooled multi-hole calibration burner for optical measurements of flames with high pressures and temperatures Peer-reviewed

Kiyonori Takeuchi, Yoshio Nunome, Sadatake Tomioka, Takeo Tomita, Taku Kudo, Akihiro Hayakawa, Hideaki Kobayashi

Journal of Thermal Science and Technology　13　(1)　2018
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jtst.2018jtst0001 　

ISSN： 1880-5566
Experimental and numerical study of the laminar burning velocity of CH4–NH3–air premixed flames Peer-reviewed

Ekenechukwu C. Okafor, Yuji Naito, Sophie Colson, Akinori Ichikawa, Taku Kudo, Akihiro Hayakawa, Hideaki Kobayashi

Combustion and Flame　187　185-198　2018
Publisher: Elsevier Inc.
DOI： 10.1016/j.combustflame.2017.09.002 　

ISSN： 1556-2921 0010-2180

eISSN： 1556-2921
Numerical Study of a Low Emission Gas Turbine Like Combustor for Turbulent Ammonia/Air Premixed Swirl Flames With a Secondary Air Injection at High Pressure Peer-reviewed

K.D.K.A. Somarathne, S. Hatakeyama, A. Hayakawa, H.Kobayashi

International Journal of Hydrogen Energy　42　(44)　27388-27399　2017/10

ISSN： 0360-3199
Experimental investigation of stabilization and emission characteristics of ammonia/air premixed flames in a swirl combustor Peer-reviewed

Akihiro Hayakawa, Yoshiyuki Arakawa, Rentaro Mimoto, K. D. Kunkuma A. Somarathne, Taku Kudo, Hideaki Kobayashi

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　42　(19)　14010-14018　2017/05

DOI： 10.1016/j.ijhydene.2017.01.046 　

ISSN： 0360-3199

eISSN： 1879-3487
OPERATION AND FLAME OBSERVATION OF MICRO GAS TURBINE FIRING AMMONIA Peer-reviewed

Norihiko Iki, Osamu Kurata, Takayuki Matsunuma, Takahiro Inoue, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Akihiro Hayakawa

PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2017, VOL 8　2017
SUCCESS OF AMMONIA-FIRED, REGENERATOR-HEATED, DIFFUSION COMBUSTION GAS TURBINE POWER GENERATION AND PROSPECT OF LOW NOX COMBUSTION WITH HIGH COMBUSTION EFFICIENCY Peer-reviewed

Osamu Kurata, Norihiko Iki, Takayuki Matsunuma, Takahiro Inoue, Taku Tsujimura, Hirohide Furutani, Akihiro Hayakawa, Hideaki Kobayashi

PROCEEDINGS OF THE ASME POWER CONFERENCE JOINT WITH ICOPE-17, 2017, VOL 1　2017
Combustion emissions from nh3 fuel gas turbine power generation demonstrated

Osamu Kurata, Norihiko Iki, Takahiro Inoue, Takayuki Matsunuma, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Akihiro Hayakawa

NH3 Energy+- Enabling Optimized, Sustainable Energy and Agriculture 2017 - Topical Conference at the 2017 AIChE Annual Meeting　2017-October　162-170　2017/01/01
Flame stabilization and emission characteristics ofammonia flames in a micro gas turbine combustor

Ekenechukwu C. Okafor, Kazuma Sakai, Akihiro Hayakawa, Taku Kudo, Osamu Kurata, Norihiko Iki, Hideaki Kobayashi

11th Asia-Pacific Conference on Combustion, ASPACC 2017　2017-December　2017/01/01
The effects of unburned-gas temperature on the characteristics of cellular premixed flames generated by hydrodynamic and diffusive-thermal instabilities in large space: fractal dimension of cellular-flame fronts Peer-reviewed

Satoshi Kadowaki, Taisuke Washio, Thwe Thwe Aung, Wataru Yamazaki, Toshiyuki Katsumi, Hideaki Kobayashi

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY　12　(1)　2017

DOI： 10.1299/jtst.2017jtst0015 　

ISSN： 1880-5566
Application of OH(2,0) Band Excitation Planar Laser-Induced Fluorescence to High-Pressure H-2/O-2 Jet Flames for Rocket Combustion Peer-reviewed

Kiyonori Takeuchi, Yoshio Nunome, Sadatake Tomioka, Takeo Tomita, Taku Kudo, Akihiro Hayakawa, Hideaki Kobayashi

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES　60　(2)　116-123　2017

ISSN： 0549-3811
Performances and emission characteristics of NH3-air and NH3-CH4-air combustion gas-turbine power generations Peer-reviewed

Osamu Kurata, Norihiko Iki, Takayuki Matsunuma, Takahiro Inoue, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Akihiro Hayakawa

PROCEEDINGS OF THE COMBUSTION INSTITUTE　36　(3)　3351-3359　2017

DOI： 10.1016/j.proci.2016.07.088 　

ISSN： 1540-7489

eISSN： 1873-2704
Numerical Investigation on the Combustion Characteristics of Turbulent Premixed Ammonia/air Flames Stabilized by a Swirl Burner Peer-reviewed

K.D.K.A. Somarathne, A. Hayakawa, H. Kobayashi

Journal of Fluid Science and Technology　11　(4)　2016/12/28

DOI： 10.1299/jfst.2016jfst0026 　

ISSN： 1880-5558
Gas Turbine Power Generation System firing Ammonia-Methane Mixture Peer-reviewed

N. Iki, O. Kurata, T. Matsunuma, T. Inoue, T. Tsujimura, H. Furutani, H. Kobayashi, A. Hayakawa

Proceedings of the Asian Congress on Gas Turbines　1-6　2016/11/14
Effect of Cavity with a Pylon on the Flame in Supersonic Flow

K. Murata, T. Yamaguchi, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Thirteenth International Conference on Flow Dynamics　730-731　2016/10/11
Effects of NH3 Addition on the Laminar Burning Velocity and Markstein Length of CH4-Air Premixed Flames

E. C. Okafor, Y. Naito, A. Ichikawa, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Thirteenth International Conference on Flow Dynamics,　210-211　2016/10/11
Quantitative Temperature Measurement of High Pressure Flame by Using laser Induced Thermal Grating Spectroscopy (LITGS)

A. Hayakawa, T. Yamagami, S. Lowe, T. Kudo, Y. Gao, S. Hochgreb, H. Kobayashi

Proceedings of the Sixteenth International Symposium on Advanced Fluid Information　142-143　2016/10/11
Ammonia-fired gas turbine power generation system

O. Kurata, N. Iki, T. Matsunuma, T. Inoue, T. Tsujimura, H. Furutani, H. Kobayashi, A. Hayakawa

Proceedings of the 21st World Hydrogen Energy Conference　147-148　2016/06/15
Stabilization and Emission Characteristics of Ammonia/air Premixed Flames in Swirling Flows

A. Hayakawa, Y. Arakawa, R. Mimoto, K.D.K.A. Somarathne, T. Kudo, H. Kobayashi

Proceedings of the 21st World Hydrogen Energy Conference　2016/06/15
Flame Visualization and Mechanism of Fast Flame Propagation Through a Meso-scale packed Porous Bed in a High-pressure Environment Peer-reviewed

M. Okuyama, T. Suzuki, J. Wang, H. Kobayashi

日本燃焼学会誌　58　(184)　107-113　2016/05/15
Publisher:
DOI： 10.20619/jcombsj.58.184_107 　

ISSN： 1347-1864
超音速流における衝撃波干渉するキャビティー保炎器下流の燃焼メカニズム Peer-reviewed

小林秀昭, 石本裕美, 工藤琢, 早川晃弘

日本航空宇宙学会論文集　64　(2)　97-103　2016/04/05
Publisher: THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
DOI： 10.2322/jjsass.64.97 　

ISSN： 1344-6460

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The objective of this study is to explore the effects of incident shock waves on combustion downstream of a cavity flameholder. The images of flame chemiluminescence showed that the flame looks extinguished downstream of an incident shock wave, as well as OH-PLIF measurements indicated higher OH concentration upstream of the incident shock wave, while lower OH concentration downstream of the incident shock wave. The results of two-dimensional numerical simulations for reacting flows showed that the incident shock wave generates a strong recirculation zone and reverse flows, and the main flow curved around the zone, corresponding well to the flame structure seen by experiments. In addition, it was found that about 90% of the injected H2 was converted to H2O at the rear edge of the calculated wall domain when an incident shock wave was introduced, which means that cavity-stabilized flames is not extinguished by the incident shock wave but burnt out there, thus the fuel was almost fully consumed. That is to say, the incident shock wave enhances chemical reactions because the generated recirculation zone and low speed region increases residence time and increased turbulent kinetic energy enhances the mixing.
高・低温度環境において流体力学的不安定性と拡散・熱的不安定性により生じるセル状予混合火炎の不安定挙動 Peer-reviewed

門脇敏, 鷲尾泰佑, トエトエアウン, 山崎渉, 勝身俊之, 小林秀昭

日本機械学会論文集　82　(835)　15-00522-15-00522　2016/03/25
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/transjsme.15-00522 　

ISSN： 2187-9761

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Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment were studied numerically. Unsteady reactive flow was calculated in large space, based on the compressible Navier-Stokes equation including chemical reaction. As the unburned-gas temperature became higher (lower), the growth rate increased (decreased) and the unstable range widened (narrowed), which was due to the enlargement (reduction) of the burning velocity of a planar flame. On the other hand, the normalized growth rate decreased (increased) and the normalized unstable range narrowed (widened) under the high (low) temperature conditions. This was due to the weakness (strength) of thermal-expansion effects and to the reduction (enlargement) of Zeldovich numbers. Furthermore, unstable behaviors of cellular flames, i.e. the coalescence and divide of cells, appeared owing to hydrodynamic and diffusive-thermal instabilities. We found that the burning velocity of a cellular flame changed drastically with time, and the average burning velocity of a cellular flame normalized by that of a planar flame decreased (increased) as the unburned-gas temperature became higher (lower). In addition, the burning velocity of a cellular flame depended strongly on the space size. As the space size became larger, the burning velocity increased monotonously. This was because that the long-wavelength components of disturbances played a significant role in the dynamics of cellular premixed flames.
A Study of Cavity Combustion for Pre-burnt Injection Gas From a Single Hole in Supersonic Air Stream Peer-reviewed

T. Yamaguchi, K. Murata, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the First Pacific Rim Thermal Engineering Conference　PRTEC-14721　2016/03
カーボンフリーアンモニア燃焼

小林秀昭, 早川晃弘

日本燃焼学会誌　58　(183)　41-48　2016/02/15

DOI： 10.20619/jcombsj.58.183_41 　
Flame Stability Limits and Emission Characteristics of an Ammonia Micro Gas Turbine Burner

Okafor Ekenechukwu C., Sakai Kazuma, Hayakawa Akihiro, Kudo Taku, Kobayashi Hideaki, Iki Norihiko, Kurata Osamu

The Proceedings of the Thermal Engineering Conference　2016　E214　2016
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeted.2016.E214 　

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The stability limits and emission characteristics of ammonia-air diffusion flames stabilized by swirl were investigated using a 50 kW micro gas turbine burner. Two liners were used, a cylindrical glass liner and a tapered gas turbine (GT) model liner. The flames were stabilized at equivalence ratios of 0.7 to 1.4 at inlet gas temperature of 298 K. The GT model liner resulted to a slightly wider stability range and lower unburnt ammonia emission. For both liners, ammonia emission increased while NOx emission decreased with equivalence ratio. The sum of NOx and ammonia emissions were found to be minimal at stoichiometric condition.
MICRO GAS TURBINE FIRING AMMONIA Peer-reviewed

Norihiko Iki, Osamu Kurata, Takayuki Matsunuma, Takahiro Inoue, Taku Tsujimura, Hirohide Furutani, Hideaki Kobayashi, Akihiro Hayakawa, Yoshiyuki Arakawa, Akinori Ichikawa

PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2016, VOL 8　2016
Effects of Incident Shockwave on Flame-holding Downstream of Ramp Injector in Supersonic Flow Peer-reviewed

Yoshitaka Iwamura, Tatsuya Yamaguchi, Akihiro Hayakawa, Taku Kudo, Hideaki Kobayashi

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES　59　(2)　64-70　2016

DOI： 10.2322/tjsass.59.64 　

ISSN： 0549-3811
Extinction characteristics of ammonia/air counterflow premixed flames at various pressures Peer-reviewed

Sophie Colson, Akihiro Hayakawa, Taku Kudo, Hideaki Kobayashi

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY　11　(3)　2016

DOI： 10.1299/jtst.2016jtst0048 　

ISSN： 1880-5566
Burning velocity and statistical flame front structure of turbulent premixed flames at high pressure up to 1.0 MPa Peer-reviewed

Jinhua Wang, Senbin Yu, Meng Zhang, Wu Jin, Zuohua Huang, Shuang Chen, Hideaki Kobayashi

EXPERIMENTAL THERMAL AND FLUID SCIENCE　68　196-204　2015/11

DOI： 10.1016/j.expthermflusci.2015.04.015 　

ISSN： 0894-1777

eISSN： 1879-2286
Laminar burning velocity and Markstein length of ammonia/air premixed flames at various pressures Peer-reviewed

Akihiro Hayakawa, Takashi Goto, Rentaro Mimoto, Yoshiyuki Arakawa, Taku Kudo, Hideaki Kobayashi

FUEL　159　98-106　2015/11

DOI： 10.1016/j.fuel.2015.06.070 　

ISSN： 0016-2361

eISSN： 1873-7153
Effects of Cross-flow on Liquid Sheet Break-up and Droplet Dimeters for Two-dimensional Air-blast Atomizer in High Pressure Environment

K. Kato, S. Suzuki, T. Kudo, S. Kato, M. Uchida, A. Hayakawa, H. Kobayashi

Proceedings of the Twelfth International Conference on Flow Dynamics (12th ICFD2015)　266-267　2015/10
Flame Characteristics of Ammonia and Methane Flames in a Swirl Combustor

Y. Arakawa, A. Hayakawa, K.D.K.A. Somarathne, T. Kudo, H. Kobayashi

Proceedings of the Twelfth International Conference on Flow Dynamics (12th ICFD2015)　708-709　2015/10
Numerical Analysis of Combustion Enhancement by Ozone Addition and Shock Wave Interaction in Supersonic Flow

K. Murata, J. Kurasawa, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Twelfth International Conference on Flow Dynamics (12th ICFD2015)　722-723　2015/10
Numerical Investigation on the Combustion Characteristics of Turbulent Premixed Swirl Flames for Ammonia/air Mixture

K.D.K.A. Somarathne, A. Hayakawa, H. Kobayashi

Proceedings of the Twelfth International Conference on Flow Dynamics (12th ICFD2015)　220-221　2015/10
Laminar burning velocity and Markstein length of ammonia/hydrogen/air premixed flames at elevated pressures Peer-reviewed

Akinori Ichikawa, Akihiro Hayakawa, Yuichi Kitagawa, K. D. Kunkuma Amila Somarathne, Taku Kudo, Hideaki Kobayashi

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　40　(30)　9570-9578　2015/08

DOI： 10.1016/j.ijhydene.2015.04.024 　

ISSN： 0360-3199

eISSN： 1879-3487
Flame Characteristics of Ammonia/hydrogen/air Premixed Flames at Elevated Pressures Peer-reviewed

A. Ichikawa, Y. Kitagawa, A. Hayakawa, T. Kudo, H. Kobayashi

Proceedings of the 10th Asia-Pacific Conference on Combustion　2015/07
Estimation of 3D flame surface density and global fuel consumption rate from 2D PLIF images of turbulent premixed flame Peer-reviewed

Meng Zhang, Jinhua Wang, Wu Jin, Zuohua Huang, Hideaki Kobayashi, Lin Ma

COMBUSTION AND FLAME　162　(5)　2087-2097　2015/05

DOI： 10.1016/j.combustflame.2015.01.007 　

ISSN： 0010-2180

eISSN： 1556-2921
NO Formation/reduction Mechanisms of Ammonia/air Premixed Flames at Various Equivalence Ratios and Pressures Peer-reviewed

A. Hayakawa, T. Goto, R.Mimoto, T. Kudo, H. Kobayashi

Mechanical Engineering Journal　2　(1)　2015/02/15
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/mej.14-00402 　

ISSN： 2187-9745

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Ammonia is a carbon-free fuel and its application to internal combustion engines is expected. However, few studies on ammonia flames, especially at high pressures, have been carried out because ammonia has not been considered to be a fuel owing to its lower combustion intensity. Most NOx, which is formed by ammonia combustion, is considered to be the fuel NOx. The objectives of this study were to investigate the fundamental characteristics of NOx experimentally, such as NO emission and chemiluminescence of ammonia/air flames not only at the atmospheric pressure but also under high pressures and to explore NO formation/reduction mechanisms using numerical simulation. Experiments were carried out using a nozzle-type burner. NH₂ ammonia α band spectra were observed, and it was clarified that the color of ammonia flame is mainly determined by the NH₂ ammonia α band and H₂O spectra. Burned gas was sampled from ammonia flame stabilized at the burner. The mole fraction of NO decreased with the increase in equivalence ratio at atmospheric pressure. Reaction flow analysis was performed, and it was clarified that the decrease in the mole fraction of NO for rich mixtures was caused by NH_i (i = 2, 1, 0). High pressure experiments were performed using a high pressure combustion facility for stoichiometric ammonia flame. Consequently, the decrease in the mole fraction of NO was experimentally observed and its tendency was found to qualitatively agree with the results of the numerical simulation. It was clarified that the third body reaction of OH + H + M ⇔ H₂O + M plays an important role in the reduction of the mole fraction of NO at the high pressure.
Application of OH-PLIF measurements using OH(2,0) band excitations to high pressure H2/O2 jet diffusion flames

Kiyonori Takeuchi, Yoshio Nunome, Takeo Tomita, Taku Kudo, Akihiro Hayakawa, Hideaki Kobayashi

ASPACC 2015 - 10th Asia-Pacific Conference on Combustion　2015
Publisher: Combustion Institute
INTRINSIC INSTABILITY OF THREE-DIMENSIONAL PREMIXED FLAMES UNDER LOW- AND HIGH-TEMPERATURE CONDITIONS: EFFECTS OF UNBURNED-GAS TEMPERATURE ON HYDRODYNAMIC AND DIFFUSIVE-THERMAL INSTABILITIES Peer-reviewed

Satoshi Kadowaki, Takuto Yanagioka, Wataru Yamazaki, Hideaki Kobayashi

COMBUSTION SCIENCE AND TECHNOLOGY　187　(8)　1167-1181　2015

DOI： 10.1080/00102202.2015.1019622 　

ISSN： 0010-2202

eISSN： 1563-521X
Atomizing Characteristics of Water and Liquid Nitrogen Jets under High Pressure Environment

R. Watanabe, N. Hiramoto, H. Ishii, H. Kobayashi

Proceedings of the Fourteenth International Symposium on Advanced Fluid Information (AFI/TFI-2014)　16-17　2014/10
Combustion Enhancement by Ozone Addition in Supersonic Flow

J. Kurasawa, K. Murata, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　522-523　2014/10
Effects of Intermediate Species on Flame Instability in Turbulent Premixed Flames of Propanol Isomers at High Pressure

S. Nakajima, T. Uchida, S. Soyoshi, T. Kudo, A. Hayakawa, S. Kadowaki, H. Kobayashi

Proceedings of the Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　500-501　2014/10
Effects of Liquid Properties on Airblast Atomization in a High Pressure Environment

S. Suzuki, K. Kato, T. Kudo, S. Kato, M. Ito, M. Uchida, A. Hayakawa, H. Kobayashi

Proceedings of the Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　448-449　2014/10
Experimental and Numerical Investigations of Laminar Burning Velocity of Ammonia/air Premixed Flames

A. Hayakawa, T. Goto, R. Mimoto, T.Kudo, H. Kobayashi

Proceedings of the Eleventh International Conference on Flow Dynamics (11th ICFD 2014　226-227　2014/10
Interaction between Incident Shock Wave and Pre-combustion Gas Injection from a Ramp Injector in Supersonic Flow

T. Yamaguchi, Y. Iwamura, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　530-531　2014/10
OH-PLIF Measurements of GH2/GO2 Diffusion Flames Using Higher Electron Excitation Bands

K. Takeuchi, Y. Nunome, T. Tomita, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　502-503　2014/10
The Effects of Intermediate Product on the Intrinsic Instability of Premixed Flames with High Lewis Number Reactant

S. Kadowaki, T. T. Aung, W. Yamazaki, H. Kobayashi

Proceedings of the Fourteenth International Symposium on Advanced Fluid Information (AFI/TFI-2014)　62-63　2014/10
Effects of Ambient Pressure and Liquid Properties on Atomization Characteristics of an Airblast Atomizer Peer-reviewed

K. Kato, S. Suzuki, T. Kudo, S. Kato, M. Itoh, M. Uchida, A. Hayakawa, H. Kobayashi

Book of Abstracts　157-158　2014/09
高圧環境におけるプレフィルミング型気流噴射弁の噴霧特性および噴霧形成過程 Peer-reviewed

加藤昂大, 鈴木聡一郎, 工藤琢, 加藤壮一郎, 伊藤光紀, 早川晃弘, 小林秀昭

学術刊行物微粒化　23　(79)　37-44　2014/07
Flame front structure of turbulent premixed flames of syngas oxyfuel mixtures Peer-reviewed

Meng Zhang, Jinhua Wang, Jin Wu, Zhilong Wei, Zuohua Huang, Hideaki Kobayashi

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　39　(10)　5176-5185　2014/03

DOI： 10.1016/j.ijhydene.2014.01.038 　

ISSN： 0360-3199

eISSN： 1879-3487
Measurement on instantaneous flame front structure of turbulent premixed CH4/H-2/air flames Peer-reviewed

Meng Zhang, Jinhua Wang, Yongliang Xie, Zhilong Wei, Wu Jin, Zuohua Huang, Hideaki Kobayashi

EXPERIMENTAL THERMAL AND FLUID SCIENCE　52　288-296　2014/01

DOI： 10.1016/j.expthermflusci.2013.10.002 　

ISSN： 0894-1777

eISSN： 1879-2286
Characteristics of Ammonia/air Laminar Premixed Flames and NO Formation/Reduction Mechanism

H. Kobayashi, A. Hayakawa, T. Goto, R. Mimoto, T. kudo

Proceedings of the Taiwan-Japan Fuel Cell-Energy Carrier Workshop　31-32　2013/12
アンモニアのエネルギーキャリアとしての利用技術 Invited Peer-reviewed

江口浩一, 小林秀昭

水素エネルギーシステム　38　(4)　264-271　2013/12
Effects of Ambient Pressure on Liquid Sheet Breakup of Airblast Atomizer

K. Kato, S. Suzuki, T. Kudo, S. Kato, M. Itoh, A. Hayakawa, H. Kobayashi

Proceedings of the Tenth International Conference on Flow Dynamics　708-709　2013/11
Interaction between Incident Shock Wave and Combustion Downstream of Ramp Injector in Supersonic Flow

Y. Iwamura, T. Yamaguchi, T. kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Tenth International Conference on Flow Dynamics　626-627　2013/11
Measurement of the instantaneous flame front structure of syngas turbulent premixed flames at high pressure Peer-reviewed

Jinhua Wang, Meng Zhang, Zuohua Huang, Taku Kudo, Hideaki Kobayashi

COMBUSTION AND FLAME　160　(11)　2434-2441　2013/11

DOI： 10.1016/j.combustflame.2013.06.008 　

ISSN： 0010-2180
Correlation of turbulent burning velocity for syngas/air mixtures at high pressure up to 1.0MPa Peer-reviewed

Jinhua Wang, Meng Zhang, Yongliang Xie, Zuohua Huang, Taku Kudo, Hideaki Kobayashi

Experimental Thermal and Fluid Science　50　90-96　2013/10

DOI： 10.1016/j.expthermflusci.2013.05.008 　

ISSN： 0894-1777
Numerical Study on the Intrinsic Instability of High-Temperature Premixed Flames under the Conditions of Constant Density and Constant Pressure in the Unburned Gas Peer-reviewed

S. Kadowaki, T. Oshima, H. Kobayashi

Journal of Fluid Science and Technology　8　(3)　233-246　2013/10
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jfst.8.233 　

ISSN： 1880-5558

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We studied numerically the intrinsic instability of high-temperature premixed flames, where the burned-gas temperature was constant, under the conditions of constant density and constant pressure in the unburned gas. A sinusoidal disturbance with sufficiently small amplitude was superimposed on a planar flame to obtain the relation between the growth rate and wave number, i.e. the dispersion relation. As the unburned-gas temperature became higher, the growth rate increased and the unstable range widened, which was due to the increase of the burning velocity of a planar flame. In sufficiently small wave-number range, the obtained numerical results were consistent with the theoretical solutions. When the growth rate and wave number were normalized, the same dispersion relations were found under the conditions both of constant density and constant pressure in the unburned gas. The normalized growth rate decreased with an increase of the unburned-gas temperature, and the normalized unstable range narrowed. This was because that the thermal-expansion effects became weaker owing to the decrease of the difference in temperature between the burned and unburned gases. To clarify the characteristics of cellular flames induced by intrinsic instability, we superimposed a disturbance with the critical wavelength. The superimposed disturbance evolved, and a cellular-shaped flame front formed. The behavior of cellular flames became milder as the unburned-gas temperature became higher, even though the growth rate increased. The burning velocity of a cellular flame normalized by that of a planar flame decreased, which was due to the weakness of the thermal-expansion effects and diffusive-thermal effects. Moreover, the burning velocity of a cellular flame increased monotonously as the length of computational domain became larger, and the dependence of burning velocity on domain length became weaker with an increase of the unburned-gas temperature.
Flame front structure and burning velocity of turbulent premixed CH 4/H2/air flames Peer-reviewed

Meng Zhang, Jinhua Wang, Yongliang Xie, Wu Jin, Zhilong Wei, Zuohua Huang, Hideaki Kobayashi

International Journal of Hydrogen Energy　38　(26)　11421-11428　2013/08/30

DOI： 10.1016/j.ijhydene.2013.05.051 　

ISSN： 0360-3199
乱流強化が高圧環境同軸酸素噴流拡散火炎の安定性に及ぼす影響 Peer-reviewed

熊上学, 加藤裕之, 白川駿, 奥山昌紀, 鈴木拓朗, 大上泰寛, 小林秀昭

日本燃焼学会誌　55　(172)　190-201　2013/05

DOI： 10.20619/jcombsj.55.172_190 　
Numerical study on the hydrodynamic instability of high-temperature premixed flames: Formation of three-dimensional cellular fronts

Satoshi Kadowaki, Yusuke Aoki, Wataru Yamazaki, Hideaki Kobayashi

Proceedings of the 9th Asia-Pacific Conference on Combustion, ASPACC 2013　2013
Publisher: Korean Society of Combustion
Turbulent premixed flame characteristics of a CO/H-2/O-2 mixture highly diluted with CO2 in a high-pressure environment Peer-reviewed

Hideaki Kobayashi, Yuki Otawara, Jinhua Wang, Futoshi Matsuno, Yasuhiro Ogami, Masaki Okuyama, Taku Kudo, Satoshi Kadowaki

PROCEEDINGS OF THE COMBUSTION INSTITUTE　34　1437-1445　2013

DOI： 10.1016/j.proci.2012.05.048 　

ISSN： 1540-7489

eISSN： 1873-2704
Flame front characteristics of turbulent premixed flames diluted with CO2 and H2O at high pressure and high temperature Peer-reviewed

Jinhua Wang, Futoshi Matsuno, Masaki Okuyama, Yasuhiro Ogami, Hideaki Kobayashi, Zuohua Huang

PROCEEDINGS OF THE COMBUSTION INSTITUTE　34　1429-1436　2013

DOI： 10.1016/j.proci.2012.06.154 　

ISSN： 1540-7489
Laminar burning velocities and flame characteristics of CO-H-2-CO2-O-2 mixtures Peer-reviewed

Jinhua Wang, Zuohua Huang, Hideaki Kobayashi, Yasuhiro Ogami

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY　37　(24)　19158-19167　2012/12

DOI： 10.1016/j.ijhydene.2012.07.103 　

ISSN： 0360-3199
高圧環境における同軸酸素噴流拡散火炎の安定性に関する研究 Peer-reviewed

熊上学, 加藤裕之, 白川駿, 奥山昌紀, 鈴木拓朗, 大上泰寛, 小林秀昭

日本燃焼学会誌　54　(170)　269-278　2012/11

DOI： 10.20619/jcombsj.54.170_269 　
Atomization Characteristics of an Airblast Atomizer Operated in aHigh Pressure Environment Peer-reviewed

S. Ishikawa, T. Kudo, H. Kobayashi, Y. Ogami, S. Kato, M. Mori

Proceedings of The Eighth KSME-JSME Thermal and Fluids Engineering Conference CD-ROM　2012/03/20
Flame Structure and Propagation Mechanism through Meso－Scale Flow Channel Network in a Packed Bed at High Pressure Peer-reviewed

M. Okuyama, T. Suzuki, J. Wang, Y. Ogami, H. Kobayashi

Proceedings of The Eighth KSME-JSME Thermal and Fluids Engineering Conference CD-ROM　2012/03/19
Numerical simulation of combustion behavior in JFE hyper 21 stoker system Peer-reviewed

Tomohiro Denda, Takashi Nakayama, Takeshi Uchiyama, Toshihiko Iwasaki, Yasuo Suzuki, Hideaki Kobayashi, Yasuhiro Ogami, Masaki Okuyama

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　78　(789)　1012-1016　2012

DOI： 10.1299/kikaib.78.1012 　

ISSN： 0387-5016
EXPERIMENTAL STUDY ON POLYMER PYROLYSIS IN HIGH-TEMPERATURE AIR DILUTED BY H2O AND CO2 USING STAGNATION-POINT FLOW Peer-reviewed

Yasuhiro Ogami, Makoto Mori, Kentaro Yoshinaga, Hideaki Kobayashi

COMBUSTION SCIENCE AND TECHNOLOGY　184　(6)　735-749　2012

DOI： 10.1080/00102202.2012.661496 　

ISSN： 0010-2202
Effects of the Unburned-Gas Temperature and Lewis Number on the Intrinsic Instability of High-Temperature Premixed Flames Peer-reviewed

Satoshi Kadowaki, Masafumi Yahata, Hideaki Kobayashi

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY　6　(3)　376-390　2011

DOI： 10.1299/jtst.6.376 　

ISSN： 1880-5566
EXPERIMENTAL STUDY ON POLYMER PYROLYSIS IN HIGH-TEMPERATURE AIR DILUTED BY H2O AND CO2 USING STAGNATION-POINT FLOW Peer-reviewed

Yasuhiro Ogami, Makoto Mori, Kentaro Yoshinaga, Hideaki Kobayashi

PROCEEDINGS OF THE ASME/JSME 8TH THERMAL ENGINEERING JOINT CONFERENCE 2011, VOL 2　157-164　2011
Effect of the incident shock wave interacting with transversal jet flow on the mixing and combustion Peer-reviewed

Toru Mai, Yoshimune Sakimitsu, Hisashi Nakamura, Yasuhiro Ogami, Taku Kudo, Hideaki Kobayashi

PROCEEDINGS OF THE COMBUSTION INSTITUTE　33　2335-2342　2011

DOI： 10.1016/j.proci.2010.07.056 　

ISSN： 1540-7489
Flame structure and radiation characteristics of CO/H-2/CO2/air turbulent premixed flames at high pressure Peer-reviewed

Yasuhisa Ichikawa, Yuki Otawara, Hideaki Kobayashi, Yasuhiro Ogami, Taku Kudo, Masaki Okuyama, Satoshi Kadowaki

PROCEEDINGS OF THE COMBUSTION INSTITUTE　33　1543-1550　2011

DOI： 10.1016/j.proci.2010.05.068 　

ISSN： 1540-7489

eISSN： 1873-2704
The effects of radiation on the dynamic behavior of cellular premixed flames generated by intrinsic instability Peer-reviewed

Satoshi Kadowaki, Hidekazu Takahashi, Hideaki Kobayashi

PROCEEDINGS OF THE COMBUSTION INSTITUTE　33　1153-1162　2011

DOI： 10.1016/j.proci.2010.06.069 　

ISSN： 1540-7489
Turbulent combustion characteristics of premixed gases in a packed pebble bed at high pressure Peer-reviewed

Masaki Okuyama, Takuro Suzuki, Yasuhiro Ogami, Manabu Kumagami, Hideaki Kobayashi

PROCEEDINGS OF THE COMBUSTION INSTITUTE　33　1639-1646　2011

DOI： 10.1016/j.proci.2010.05.071 　

ISSN： 1540-7489
Effects of Pressure on Laminar Burning Velocity for Fuel-rich CH4/O2 Flames With Steam Dilution Peer-reviewed

Y. Ogami, Y. Tamaki, M. kumagami, H. Kobayashi

8th Asia-Pacific Conference on Combustion , (2010)　120-120　2010/12
Experimental Study on The Stability of Oxygen-Jet Diffusion Flames at Elevated Pressure Peer-reviewed

H. Kato, M. Kumagami, M. Okuyama, Y. Ogami, H. Kobayash

8th Asia-Pacific Conference on Combustion , (2010)　247-247　2010/12
Turbulent Flame Propagation for Preheated CH4/air Mixture in a Packed Pebble Bed at High Pressure Peer-reviewed

M. Okuyama, T. Suzuki, Y. Ogami, M. Kumagami, H. Kobayashi

8th Asia-Pacific Conference on Combustion , (2010)　125-125　2010/12
エンタピー一定条件下における高温予混合火炎の固有不安定性に関する数値シミュレーション Peer-reviewed

門脇敏, 八幡将史, 小林秀昭

日本燃焼学会誌　52　(162)　63-68　2010/11/15

DOI： 10.20619/jcombsj.52.162_329 　
Effect of Pressure on Premixed Flame Propagation Mode in a Packed Pebble Bed Reactor

M. Okuyama, T. Suzuki, Y. Ogami, M. Kumagami, H. Kobayashi

The Seventh International Conference on Flow Dynamics (7th ICFD 2010), (2010)　638-639　2010/11
The Tenth International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration

S. Kadowaki, M. Yahata, H. Kobayashi

International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI/TFI-2010), (2010)　58-59　2010/11
Turbulent Burning Velocity and Flame Structure of CO/H2/CO2Premixed Flames in a High Pressure Environment

Y. Otawara, Y. Ichikawa, J. H. Wang, Y. Ogami, T. Kudo, M. Okuyama, H. Kobayashi

The Seventh International Conference on Flow Dynamics (7th ICFD 2010), (2010)　636-637　2010/11
Droplet combustion in presence of airstream oscillation: Mechanisms of enhancement and hysteresis of burning rate in microgravity at elevated pressure Peer-reviewed

Mehdi Jangi, Hideaki Kobayashi

COMBUSTION AND FLAME　157　(1)　91-105　2010/01

DOI： 10.1016/j.combustflame.2009.06.004 　

ISSN： 0010-2180
Thermal-drag and Transition from Quasi-steady to Highly-unsteady Combustion of a Fuel Droplet in the Presence of Upstream Velocity Oscillations Peer-reviewed

Mehdi Jangi, Benjamin Shaw, Hideaki Kobayashi

FLOW TURBULENCE AND COMBUSTION　84　(1)　97-123　2010/01

DOI： 10.1007/s10494-009-9230-2 　

ISSN： 1386-6184
Numerical Analysis of Extremely-rich CH4/O-2/H2O Premixed Flames at High Pressure and High Temperature Considering Production of Higher Hydrocarbons Peer-reviewed

Manabu Kumagami, Yasuhiro Ogami, Yuichi Tamaki, Hideaki Kobayashi

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY　5　(1)　109-123　2010

DOI： 10.1299/jtst.5.109 　

ISSN： 1880-5566
Development of an Ethanol Reduced Kinetic Mechanism Based on the Quasi-Steady State Assumption and Feasibility Evaluation for Multi-Dimensional Flame Analysis Peer-reviewed

Masaki Okuyama, Shinichiro Hirano, Yasuhiro Ogami, Hisashi Nakamura, Yiguang Ju, Hideaki Kobayashi

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY　5　(2)　189-199　2010

DOI： 10.1299/jtst.5.189 　

ISSN： 1880-5566
A Study of Turbulent Combustion Mechanism in a Packed Pebble Bed at High Pressure

M.Okuyama, Y.Ogami, Y.Ichikawa, M.Kumagami, H.Kobayashi

Sixth International Conference on Flow Dynamis　312-313　2009/11
Dynamics of Premixed Flames Propagating in Non-Uniform Velocity Fields:Combined Effects of Intrinsic Instability and Radiation

Satoshi Kadowaki, Hidekazu Takahashi, Hideaki kobayashil

AFI/TFI-2009　44-45　2009/11
Estimation of Kinetic Parameters of Polymer Pyrolysis in High-Temperature Air Combustion Combining Experiment and Numerical Analysis

Makoto Mori, Kentaro Yoshinaga, Yasuhiro Ogami, Hideaki kobayashi

Sixth International Conference on Flow Dynamis　324-325　2009/11
Microgravity Experiment and Numerical Simulation on Droplet Combustion in Varying Forced Convection at Elevated Pressure

Y.Ogami, M.Jangi, H.Kobayashi

Sixth International Conference on Flow Dynamis　572-573　2009/11
Heat and mass transfer of a fuel droplet evaporating in oscillatory flow Peer-reviewed

M. Jangi, H. Kobayashi

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW　30　(4)　729-740　2009/08

DOI： 10.1016/j.ijheatfluidflow.2009.03.012 　

ISSN： 0142-727X
A Study of Interaction between Shock Wave and Cross-Flow Jet Using Particle Tracking Velocimetry Peer-reviewed

Hisashi Nakamura, Naoki Sato, Syunsuke Ishida, Yasuhiro Ogami, Hideaki Kobayashi

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES　52　(176)　81-88　2009/08

DOI： 10.2322/tjsass.52.81 　

ISSN： 0549-3811
Characteristics of Flow Field Around Wall Injection Interacting with Incident Shock Wave in Supersonic Airstream Peer-reviewed

S.Ishida, Y.Sakimitsu, H.Nakamura, Y.Ogami, T.Kudo, H.Kobayashi

7th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics　2009/06
Recent Progress in High-Pressure Combustion Research Invited Peer-reviewed

Hideaki Kobayashi

7th Asia-Pacific Conference on Combustion　49-52　2009/05/27
Generation of a Reduced Kinetic Mechanism of Ethanol and Application to 1-d and 2-d Numerical Simulations Peer-reviewed

M.Okuyama, S.Hironao, Y.Ogami, H.Nakamura, M.Kwase,Y.Ju, H.Kobayashi

7th Asia-Pacific Conference on Combustion　2009/05
Numerical Analysis of CH4/O2 Premixed Flames Diluted by Superheated Steam at High Pressure Peer-reviewed

Y.Ogami, Y.Tamaki, M.Kumagami, H.Kobayashi

7th Asia-Pacific Conference on Combustion　2009/05
Dynamic Behavior of Premixed Flames Propagating in Non-Uniform Velocity Fields-Assessment of Intrinsic Instability in Turbulent Combustion Peer-reviewed

Satoshi Kadowaki, Hideaki Kobayashi

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES　51　(174)　244-251　2009/02

DOI： 10.2322/tjsass.51.244 　

ISSN： 0549-3811
Effects of radiation on the dynamic behavior of premixed flames Peer-reviewed

S. Kadowaki, H. Kubota, H. Kobayashi

TURBULENCE, HEAT AND MASS TRANSFER 6　671-674　2009
Bifurcations of stretched premixed flame stabilized by a hot wall Peer-reviewed

Hisashi Nakamura, Aiwu Fan, Hideaki Minamizono, Kaoru Maruta, Hideaki Kobayashi, Takashi Niioka

PROCEEDINGS OF THE COMBUSTION INSTITUTE　32　1367-1374　2009

DOI： 10.1016/j.proci.2008.05.045 　

ISSN： 1540-7489
Characteristics of Pyrolysis and Combustion of Polymers in Stagnation-Point Flow for Preheated and Diluted Air with H2O and CO2 Peer-reviewed

Kentaro Yoshinaga, Makoto Mori, Yasuhiro Ogami, Hideaki Kobayashi

COMBUSTION SCIENCE AND TECHNOLOGY　181　(1)　159-175　2009

DOI： 10.1080/00102200802424583 　

ISSN： 0010-2202
Dilution effects of superheated water vapor on turbulent premixed flames at high pressure and high temperature Peer-reviewed

Hideaki Kobayashi, Soichiro Yata, Yasuhisa Ichikawa, Yasuhiro Ogami

PROCEEDINGS OF THE COMBUSTION INSTITUTE　32　2607-2614　2009

DOI： 10.1016/j.proci.2008.05.078 　

ISSN： 1540-7489
Microgravity experiments of single droplet combustion in oscillatory flow at elevated pressure Peer-reviewed

Yasuhiro Ogami, Satoru Sakurai, Syoichi Hasegawa, Mehdi Jangi, Hisashi Nakamura, Kentaro Yoshinaga, Hideaki Kobayashi

PROCEEDINGS OF THE COMBUSTION INSTITUTE　32　2171-2178　2009

DOI： 10.1016/j.proci.2008.05.008 　

ISSN： 1540-7489
On the validity of quasi-steady assumption in transient droplet combustion Peer-reviewed

M. Jangi, S. Sakurai, Y. Ogami, H. Kobayashi

COMBUSTION AND FLAME　156　(1)　99-105　2009/01

DOI： 10.1016/j.combustflame.2008.09.005 　

ISSN： 0010-2180
Effect of the Location of an Incident Shock Wave on Combustion and Flow Field of Wall Fuel-Injection Peer-reviewed

Hisashi Nakamura, Naoki Sato, Hideaki Kobayashi, Goro Masuya

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES　51　(173)　170-175　2008/11

DOI： 10.2322/tjsass.51.170 　

ISSN： 0549-3811
超音速流における噴流場の構造に及ぼす衝撃波入射位置の影響

石田俊輔, 先光吉宗, 中村寿, 大上泰寛, 工藤琢, 小林秀昭

流体科学研究所報告　19　1-10　2008/10
Publisher:
ISSN： 0916-2860
予混合型ガスタービン燃焼器における燃焼振動の線形一次元解析に及ぼす音響インピーダンスの影響 Peer-reviewed

加藤壮一郎, 藤森俊郎, 小林秀昭

日本燃焼学会誌　50　72-80　2008/02

DOI： 10.20619/jcombsj.50.151_72 　
Numerical Study of Radiation Effects on Polypropylene Combustion Using High-temperature Oxidizer Diluted with H2O and CO2 Peer-reviewed

Kentaro Yoshinaga, Hidaeki Kobayashi

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY　3　(2)　167-178　2008

DOI： 10.1299/jtst.3.167 　

ISSN： 1880-5566
粒子追跡速度計法を用いた壁面噴射場と衝撃波の干渉現象の研究 Peer-reviewed

中村寿, 佐藤直樹, 石田俊輔, 大上泰寛, 小林秀昭

日本航空宇宙学会論文集　55　(647)　597-603　2007/11
Publisher: THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
DOI： 10.2322/jjsass.55.597 　

ISSN： 1344-6460

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An experimental study was performed to investigate the flame-holding of hydrogen jet injected into supersonic cross-flow interacting with an incident shock wave. Pre-burned rich hydrogen or air was injected in supersonic airflow at Mach 2.5. The injection pressure was 1.2MPa or 1.6MPa. The deflection angle of the shock generator was 10 deg. Velocity profiles near the wall and those of recirculation zones around the injection slot could successfully be measured using newly-devised PTV method in this study. The velocity profiles showed that re-attachment point of separation downstream of the injection slot moves downstream when the incident shock wave is introduced to downstream of the injection slot. The re-attachment point with the incident shock wave in case of the injection pressure of 1.6MPa was not so different from that of 1.2MPa. However, extinction limit in case of the injection pressure of 1.6MPa extended than that of 1.2MPa.
Response of Single Droplet Combustion to Oscillatory Flow at Elevated Pressure in Microgravity Invited Peer-reviewed

Hideaki Kobayashi, Mehdi Jangi, Shoichi Hasegawa, Yasuhiro Ogami, Kentaro Yoshinaga, Hisashi Nakamura

Third International Symposium on Physical Science in Space 2007　195-196　2007/10
Fundamental Flame Research for Further Applications of High-Temperature Air Combustion Invited Peer-reviewed

Hideaki Kobayashi

Proceedings of the 15th IFRF Members' Meeting, Combustion in an Efficient and Environmentally Acceptable Manner　CD-ROM　2007/06
Effects of Location of an Incident Shock Wave on Combustion and Flow Structure of Transverse Hydrogen Injection Peer-reviewed

Hisashi Nakamura, Naoki Sato, Hideaki Kobayashi

Proceedings of the 6th Asia-Pacific Conference on Combustion　67-70　2007/05
Experimental and Numerical Studies of Local Burning Velocities for Two-dimensional Bunsen Flames Peer-reviewed

Yasuhiro Ogami, Hisashi Nakamura, Hideaki Kobayashi

Proceedings of the 6th Asia-Pacific Conference on Combustion　134-137　2007/05
衝撃波の入射位置が壁面燃料噴射場における燃焼と流れ場に及ぼす影響 Peer-reviewed

中村寿, 佐藤直樹, 小林秀昭, 升谷五郎

日本航空宇宙学会論文集　55　(638)　125-129　2007/03
Publisher: THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
DOI： 10.2322/jjsass.55.125 　

ISSN： 1344-6460

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Experimental and numerical studies of the interaction between combustion of a hydrogen jet and an incident shock wave were performed. In the case that an incident shock wave was introduced upstream of the injection slot, the boundary-layer separation region was extensively expanded. The penetration height of the Mach disk with an incident shock wave was less than that without an incident shock wave. Combustion was confirmed when the incident shock wave was introduced downstream of the fuel injection slot, while, with the incident shock wave upstream of fuel injection slot, combustion was not confirmed. The mechanism of these phenomena was discussed based on the results of numerical simulation in terms of the residence time in the separation region near the fuel injection slot.
Effects of CO2 dilution on turbulent premixed flames at high pressure and high temperature Peer-reviewed

Hideaki Kobayashi, Hirokazu Hagiwara, Hideaki Kaneko, Yasuhiro Ogami

PROCEEDINGS OF THE COMBUSTION INSTITUTE　31　1451-1458　2007

DOI： 10.1016/j.proci.2006.07.159 　

ISSN： 1540-7489
High-pressure combustion phenomena Invited Peer-reviewed

Hideaki Kobayashi

PROCEEDINGS OF THE ASME/JSME THERMAL ENGINEERING SUMMER HEAT TRANSFER CONFERENCE 2007, VOL 3　893-901　2007
Microgravity Experiments on the Effect of Air-flow Variation on Droplet Combustion at High Pressure Peer-reviewed

Mehdi Jangi, Satoru Sakurai, Yasuhiro Ogami, Hideaki Kobayashi

Drop Tower Days 2006　45-46　2006/10
Droplet combustion experiments in varying forced convection using microgravity environment Peer-reviewed

M Mitsuya, H Hanai, S Sakurai, Y Ogami, H Kobayashi

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW　26　(6)　914-921　2005/12

DOI： 10.1016/j.ijheatfluidflow.2005.10.004 　

ISSN： 0142-727X
Numerical Investigation of the Effects on Polypropylene Combustion by the Addition of Water Vapor and CO2 to High Temperature Oxidizer Peer-reviewed

Kentaro Yashinaga, Hideaki Kobayashi

5th Asia-Pacific Conference on Combustion　2005/07/18
Combustion of Transverse Hydrogen Injection under Interaction with Shock Wave in a Supersonic Airstream Peer-reviewed

Hisashi Nakamura, Naoki Sato, Hideaki Kobayashi, Takashi Niioka, Goro Masuya

5th Asia-Pacific Conference on Combustion　2005/07/18
Yasuhiro Ogami and Hideaki Kobayashi, Laminar Burning Velocity for CH4/air Premixed Flames at High Pressure and High Temperature for Various Equivalence Ratios Peer-reviewed

Yasuhiro Ogami, Hideaki Kobayashi

5th Asia-Pacific Conference on Combustion　2005/07/18
Numerical and experimental studies of injection modeling for supersonic flame-holding Peer-reviewed

S Tabejamaat, H Kobayashi, T Niioka

JOURNAL OF PROPULSION AND POWER　21　(3)　504-511　2005/05

ISSN： 0748-4658
Effects of varying forced convection on single and twin droplets combustion in microgravity

Hideaki Kobayashi, Masaki Mitsuya, Hironao Hanai, Satoru Sakurai, Yasuhiro Ogami

International Astronautical Federation - 56th International Astronautical Congress 2005　1　582-590　2005
Burning velocity correlation of methane/air turbulent premixed flames at high pressure and high temperature Peer-reviewed

Hideaki Kobayashi, Katsuhiro Seyama, Hirokazu Hagiwara, Yasuhiro Ogami

Proceedings of the Combustion Institute　30　(1)　827-834　2005
Publisher: Elsevier Ltd
DOI： 10.1016/j.proci.2004.08.098 　

ISSN： 1540-7489
The unstable behavior of cellular premixed flames induced by intrinsic instability Peer-reviewed

Satoshi Kadowaki, Hiroshi Suzuki, Hideaki Kobayashi

Proceedings of the Combustion Institute　30　(1)　169-176　2005
Publisher: Elsevier Ltd
DOI： 10.1016/j.proci.2004.07.041 　

ISSN： 1540-7489
Measurement of supersonic flow field using particle tracking velocimetry Peer-reviewed

H Nakamura, N Sato, H Kobayashi, G Masuya

ICIASF '05 Record: 21st International Congress on Instrumentation in Aerospace Simulation Facilities　324-329　2005
The unstable behavior of cellular premixed flames induced by intrinsic instability Peer-reviewed

S Kadowaki, H Suzuki, H Kobayashi

PROCEEDINGS OF THE COMBUSTION INSTITUTE　30　169-176　2005

DOI： 10.1016/j.proci.2004.07.041 　

ISSN： 0082-0784
Burning velocity correlation of methane/air turbulent premixed flames at high pressure and high temperature Peer-reviewed

H Kobayashi, K Seyama, H Hagiwara, Y Ogami

PROCEEDINGS OF THE COMBUSTION INSTITUTE　30　827-834　2005

DOI： 10.1016/j.proci.2004.08.098 　

ISSN： 0082-0784
Effect of heat release distribution on combustion oscillation Peer-reviewed

S Kato, T Fujimori, AP Dowling, H Kobayashi

PROCEEDINGS OF THE COMBUSTION INSTITUTE　30　1799-1806　2005

DOI： 10.1016/j.proci.2004.08.154 　

ISSN： 0082-0784
非一様速度場を伝播する予混合火炎の数値解析－動的挙動に及ぼす固有不安定性の影響－ Peer-reviewed

門脇敏, 鈴木洋史, 小林秀昭

日本燃焼学会誌　47　(141)　220-226　2005
Publisher:
ISSN： 1347-1864
微小重力場における揮発性燃料の火炎伝播速度およびその伝播挙動 Peer-reviewed

布目佳央, 吉永健太郎, 花井宏尚, 小林秀昭, 新岡嵩

日本燃焼学会誌　47　227-236　2005
高温空気燃焼におけるメタン－空気簡略化反応機構の適用に関する研究 Peer-reviewed

齋藤寛起, 大上泰寛, 小林秀昭, 新岡嵩, 毛利孝明, 穂積良和, 汐崎徹

日本燃焼学会誌　47　(140)　119-128　2005
Publisher:
ISSN： 1347-1864
Experimental and numerical study of laminar burning velocity for CH4/air premixed flame at elevated pressure and temperature Peer-reviewed

Y Ogami, H Kobayashi, M Mitsuya, H Saito, T Niioka

COMBUSTION SCIENCE AND TECHNOLOGY IN ASIA-PACIFIC AREA: TODAY AND TOMORROW　27-30　2003
An experimental and numerical study on extinction limits of stretched diffusion flame in high-temperature air Peer-reviewed

H Hanai, H Kobayashi, T Niioka

COMBUSTION SCIENCE AND TECHNOLOGY IN ASIA-PACIFIC AREA: TODAY AND TOMORROW　91-94　2003
Relationship between the smallest scale of flame wrinkles and turbulence characteristics of high-pressure, high-temperature turbulent premixed flames Peer-reviewed

H Kobayashi, T Kawahata, K Seyama, T Fujimari, JS Kim

PROCEEDINGS OF THE COMBUSTION INSTITUTE　29　1793-1800　2003

ISSN： 0082-0784
Flame propagation of n-decane spray in microgravity Peer-reviewed

Y Nunome, S Kato, K Maruta, H Kobayashi, T Niioka

PROCEEDINGS OF THE COMBUSTION INSTITUTE　29　2621-2626　2003

ISSN： 0082-0784
流体力学的効果と拡散・熱的効果による予混合火炎の不安定挙動 Peer-reviewed

門脇敏, 益子敬幸, 小林秀昭

日本燃焼学会誌　45　(133)　177-183　2003
Publisher:
ISSN： 1347-1864
Microgravity experiments on flame spread of an n-decane droplet array in a high-pressure environment Peer-reviewed

H Kobayashi, J Park, T Iwahashi, T Niioka

PROCEEDINGS OF THE COMBUSTION INSTITUTE　29　2603-2610　2003

ISSN： 0082-0784
Structures and stability of lifted combustion zones in preheated oxidizer Peer-reviewed

JM Ruan, H Kobayashi, T Niioka, A Abuliti, F Iida

JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING　45　(3)　499-505　2002/08

DOI： 10.1299/jsmeb.45.499 　

ISSN： 1340-8054
NOx emission from high-temperature air/methane counterflow diffusion flame Peer-reviewed

R Fuse, H Kobayashi, YG Ju, K Maruta, T Niioka

INTERNATIONAL JOURNAL OF THERMAL SCIENCES　41　(7)　693-698　2002/07

DOI： 10.1016/S1290-0729(02)01364-9 　

ISSN： 1290-0729
Flame propagation of n-decane spray in microgravity Peer-reviewed

Yoshio Nunome, Soichiro Kato, Kaoru Maruta, Hideaki Kobayashi, Takashi Niioka

Proceedings of the Combustion Institute　29　(2)　2621-2626　2002
Publisher: Elsevier Ltd
DOI： 10.1016/S1540-7489(02)80319-4 　

ISSN： 1540-7489
混合燃料の対向流拡散火炎の消炎に関する研究 Peer-reviewed

傳田知広, 丸田薫, 小林秀昭, 新岡嵩

日本燃焼学会誌　44　158-165　2002
高温・高圧下におけるH2/O2/He予混合火炎の層流燃焼速度に関する研究 Peer-reviewed

大上泰寛, 小林秀昭

日本燃焼学会誌　44　(127)　58-66　2002
Publisher:
ISSN： 1347-1864
Combined effects of nongray radiation and pressure on premixed CH4/O-2/CO2 flames Peer-reviewed

JM Ruan, H Kobayashi, T Niioka, YG Ju

COMBUSTION AND FLAME　124　(1-2)　225-230　2001/01

DOI： 10.1016/S0010-2180(00)00198-X 　

ISSN： 0010-2180
Measurement and analysis of flame surface density for turbulent premixed combustion on a nozzle-type burner Peer-reviewed

GG Lee, KY Huh, H Kobayashi

COMBUSTION AND FLAME　122　(1-2)　43-57　2000/07

DOI： 10.1016/S0010-2180(00)00102-4 　

ISSN： 0010-2180

eISSN： 1556-2921
Laminar burning velocity of hydrogen-air premixed flames at elevated pressure Peer-reviewed

Qin, X, H Kobayashi, T Niioka

EXPERIMENTAL THERMAL AND FLUID SCIENCE　21　(1-3)　58-63　2000/03

DOI： 10.1016/S0894-1777(99)00054-0 　

ISSN： 0894-1777
A numerical study of pulsating flame propagation in mixtures of gas and particles Peer-reviewed

Hironao Hanai, Hideaki Kobayashi, Takashi Niioka

Proceedings of the Combustion Institute　28　(1)　815-822　2000
Publisher: Elsevier Ltd
DOI： 10.1016/S0082-0784(00)80285-4 　

ISSN： 1540-7489
Microgravity ignition experiment on a droplet array in high-temperature low-speed airflow Peer-reviewed

H Nohara, K Maruta, S Hasegawa, H Kobayashi, T Niioka

COMBUSTION SCIENCE AND TECHNOLOGY　153　169-178　2000

DOI： 10.1080/00102200008947258 　

ISSN： 0010-2202
微速空気流中における液滴・液滴列の着火に関する研究 Peer-reviewed

渡辺秀人, 丸田薫, 長谷川進, 小林秀昭, 新岡嵩

日本マイクログラビティー応用学会誌　17　169-202　2000
A numerical study of pulsating flame propagation in mixtures of gas and particles Peer-reviewed

H Hanai, H Kobayashi, T Niioka

PROCEEDINGS OF THE COMBUSTION INSTITUTE　28　815-822　2000

ISSN： 0082-0784
Flame instability effects on the smallest wrinkling scale and burning velocity of high-pressure turbulent premixed flames Peer-reviewed

H Kobayashi, H Kawazoe

PROCEEDINGS OF THE COMBUSTION INSTITUTE　28　375-382　2000

ISSN： 0082-0784
Flame spread behaviour of blended fuel droplet array Peer-reviewed

J Park, H Kobayashi, T Niioka

INTERNATIONAL JOURNAL OF ENERGY RESEARCH　23　(15)　1305-1312　1999/12

DOI： 10.1002/(SICI)1099-114X(199912)23:15<1305::AID-ER554>3.0.CO;2-F 　

ISSN： 0363-907X
A lean flammability limit of polymethylmethacrylate particle-cloud in microgravity Peer-reviewed

H Hanai, M Ueki, K Maruta, H Kobayashi, S Hasegawa, T Niioka

COMBUSTION AND FLAME　118　(3)　359-369　1999/08

DOI： 10.1016/S0010-2180(99)00003-6 　

ISSN： 0010-2180
A study of flame spread along a droplet array at elevated pressures up to a supercritical pressure Peer-reviewed

J Park, H Kobayashi, T Niioka

INTERNATIONAL JOURNAL OF ENERGY RESEARCH　23　(9)　813-826　1999/07

DOI： 10.1002/(SICI)1099-114X(199907)23:9<813::AID-ER521>3.0.CO;2-J 　

ISSN： 0363-907X
LIF measurements of Turbulent Premixed Flames in a High Pressure Environment

Hideaki Kobayashi, Yasuo Oyachi, Kaoru Maruta

5th ASME/JSME Joint Thermal Engineering Conference　AJTE99-6480　1999/03
Experimental and numerical study of flame ball IR and UV emissions Peer-reviewed

M Abid, MS Wu, JB Liu, PD Ronney, M Ueki, K Maruta, H Kobayasiii, T Niioka, DM Vanzandt

COMBUSTION AND FLAME　116　(3)　348-359　1999/02

DOI： 10.1016/S0010-2180(98)00103-5 　

ISSN： 0010-2180
A Study on Laminar Burning Velocity of CH4/O2/CO2 Flames Peer-reviewed

KOBAYASHI Hideaki

日本機械学会論文集(B編)　65　(635)　2513-2518　1999
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.65.2513 　

ISSN： 0387-5016

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Experimental and numerical investigations were performed for the Iaminar burning velocity and the flame structure of laminar premixed CH_4/O_2/CO_2 flames. Measurements of the laminar burning velocity were conducted by using a flame cone angle method for a circular nozzle burner. Numerical simulation was performed using one-dimensional plane flame code including radiation heat loss with an optically thin model. It was shown that the laminar burning velocity decrease with CO_2 addition even though the adiabatic flame temperature is the same as that for CH_4/Air flames. The radiation heat loss is significant for the CH_4/O_2/CO_2 flames, and the flame temperature and laminar burning velocity decreases when the radiation heat loss is considered. Effects of thermal properties, radiation, and chemical reaction on the determination of the laminar burning velocity of CH_4/O_2/CO_2 flames were discussed.
Experiments on flame spread of a fuel droplet array in a high-pressure ambience Peer-reviewed

S Kato, H Mizuno, H Kobayashi, T Niioka

JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING　41　(2)　322-330　1998/05

DOI： 10.1299/jsmeb.41.322 　

ISSN： 1340-8054
Experiment on Flame Spread of a Fuel Droplet Array in Opposed Airflow Peer-reviewed

KOBAYASHI Hideaki

Space Forum　4　33-48　1998
Experimental study on general correlation of turbulent burning velocity at high pressure

H Kobayashi, Y Kawabata, K Maruta

TWENTY-SEVENTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION, VOLS 1 AND 2　941-948　1998
Pulsating flame propagation of PMMA particle cloud in microgravity

H Hanai, K Maruta, H Kobayashi, T Niioka

TWENTY-SEVENTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION, VOLS 1 AND 2　2675-2681　1998
The Efects of Air Addition to the Injected Fuel on Flame-Holding Behind a Strut by Incident Shock Waves Peer-reviewed

KOBAYASHI Hideaki

日本航空宇宙学会論文集　45　(516)　36-45　1997
Publisher:
DOI： 10.2322/jjsass1969.45.36 　

ISSN： 0021-4663
Turbulence measurements and observations of turbulent premixed flames at elevated pressures up to 3.0 MPa Peer-reviewed

H Kobayashi, T Nakashima, T Tamura, K Maruta, T Niioka

COMBUSTION AND FLAME　108　(1-2)　104-117　1997/01

DOI： 10.1016/S0010-2180(96)00103-4 　

ISSN： 0010-2180
Improvement of Flame-Holding Characteristics of a Scramjet Strut Divided into Two Parts Peer-reviewed

KOBAYASHI Hideaki

日本航空宇宙学会誌　44　(505)　80-86　1996
Publisher:
DOI： 10.2322/jjsass1969.44.80 　

ISSN： 0021-4663
Burning velocity of turbulent premixed flames in a high-pressure environment

H Kobayashi, T Tamura, K Maruta, T Niioka, FA Williams

TWENTY-SIXTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION, VOLS 1 AND 2　389-396　1996

DOI： 10.1016/S0082-0784(96)80240-2 　
An experimental study on particle-cloud flames in a microgravity field

Y Okuyama, Y Ohtomo, K Maruta, H Kobayashi, T Niioka

TWENTY-SIXTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION, VOLS 1 AND 2　1369-1375　1996

DOI： 10.1016/S0082-0784(96)80356-0 　
Ignition experiment on droplet matrix in microgravity Peer-reviewed

T Kadowaki, K Maruta, H Kobayashi, S Hasegawa, T Niioka

MICROGRAVITY SCIENCE AND TECHNOLOGY　9　(4)　269-274　1996

ISSN： 0938-0108
Flame-Holding Mechanism of a Newly Devised Strut for the Scramjet Engine Peer-reviewed

KOBAYASHI Hideaki

Propulsion and Power　38　117　1995
Flame Stabilization of Silane-Added Methane at Bckward-Facing Step Peer-reviewed

KOBAYASHI Hideaki

燃焼の科学と技術　1　275　1994
Ignition experiment of a fuel droplet in high-pressure high-temperature ambient Peer-reviewed

Ryota Nakanishi, Hideaki Kobayashi, Shinichiro Kato, Takashi Niioka

Symposium (International) on Combustion　25　(1)　447-453　1994

DOI： 10.1016/S0082-0784(06)80673-9 　

ISSN： 0082-0784
Ignition Experiments on Droplet Array in Normal and Microgravity Environments Peer-reviewed

KOBAYASHI Hideaki

IUTAM Symp. on Combust. Droplets and Sprays　367　1994
Flame propagation experiment of PMMA particle cloud in a microgravity environment Peer-reviewed

Hideaki Kobayashi, Naomichi Ono, Yozo Okuyama, Takashi Nioka

Symposium (International) on Combustion　25　(1)　1693-1699　1994

DOI： 10.1016/S0082-0784(06)80817-9 　

ISSN： 0082-0784
EFFECTS OF EQUIVALENCE RATIO ON THE EXTINCTION STRETCH RATE OF CYLINDRICAL PREMIXED FLAMES Peer-reviewed

H KOBAYASHI, M KITANO

COMBUSTION SCIENCE AND TECHNOLOGY　89　(1-4)　253-263　1993

ISSN： 0010-2202

eISSN： 1563-521X
Ignition Experiment of a Blended-Fuel Droplet in a Microgravity Field Peer-reviewed

KOBAYASHI Hideaki

Microgravity Science and Technology　3,184　1993
Evaporation and Mixing Promotion and Combustion of Liquid Fuel by Air Bubble Blowing Peer-reviewed

KOBAYASHI Hideaki

日本機械学会論文集(B編)　59　(568)　3974-3974　1993

DOI： 10.1299/kikaib.59.3974 　
FLOW-FIELDS AND EXTINCTION OF STRETCHED CYLINDRICAL PREMIXED FLAMES Peer-reviewed

H KOBAYASHI, M KITANO

COMBUSTION SCIENCE AND TECHNOLOGY　75　(4-6)　227-239　1991

DOI： 10.1080/00102209108924090 　

ISSN： 0010-2202
Dimensional Effects of Nozzle-type Burner on Flow Fields and Extinction of Counterflow Twin Flames Peer-reviewed

KOBAYASHI Hideaki

Transactions of the Japan Society of Mechanical Engineers　57　(535)　535-1146　1991
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.57.1141 　

ISSN： 0387-5016

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The flow fields of a counterflow nozzle burner and counterflow twin flames for propane-air mixture stabilized with that burner were measured using LDV. The effects of the burner dimension, i.e., the outlet diameter of two opposed contraction nozzles and the distance between them, on the velocity profiles and extinction limits of the twin flames were examined. Results show that the effects of burner dimension on the extinction limit do not appear when the velocity gradient upstream of the front edge of preheating zone is used as a flow parameter and that the ratio of nozzle distance to nozzle outlet diameter is the main factor determining the dimensional effects on the flow characteristics. It is also shown that the flame stretch rate of the twin flames defined at the stagnation plane is about two times as large as that defined at the cold boundary of the flame.
SOOTING LIMIT OF A DROPLET FLAME Peer-reviewed

M KITANO, H KOBAYASHI, T SUGIMOTO

COMBUSTION SCIENCE AND TECHNOLOGY　78　(1-3)　19-31　1991

ISSN： 0010-2202
EXTINCTION CHARACTERISTICS OF A STRETCHED CYLINDRICAL PREMIXED FLAME Peer-reviewed

H KOBAYASHI, M KITANO

COMBUSTION AND FLAME　76　(3-4)　285-295　1989/06

ISSN： 0010-2180
A STUDY OF CYLINDRICAL PREMIXED FLAMES WITH HEAT-LOSS Peer-reviewed

M KITANO, H KOBAYASHI, Y OTSUKA

COMBUSTION AND FLAME　76　(1)　89-105　1989/04

DOI： 10.1016/0010-2180(89)90080-1 　

ISSN： 0010-2180
Sooting Limit of a Double Diffusion Flame Peer-reviewed

KOBAYASHI Hideaki

Transaction of the Japan Society of Mechanical Engineers　55　(515)　1979-1984　1989
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.55.1979 　

ISSN： 0387-5016

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Inside a coaxial flow diffusion flame of the ordinary type (fuel ejection into an air atmosphere), another diffusion flame of the reverse type (air ejection into a fuel atmosphere) was formed. The sooting limits of this double diffusion flame were measured for propane with three different types of burners, and the effect of several factors, such as the amount of inner air, flame-to-flame distance, thermal condition between the two flames, and flow stretch, were investigated. On the basis of the results, the effectiveness of making use of the double flame in the suppression of soot emission from diffusion flames of the coaxial flow type was discussed. The main findings were : (1) The double flame condition suppressed soot emission more effectively. (2) The sooting limit was controlled by the outer flame temperature, and therefore, adjusting the factors so as to increase this temperature may lead to much stronger soot suppression.
AN ANALYSIS OF A STRETCHED CYLINDRICAL PREMIXED FLAME Peer-reviewed

H KOBAYASHI, M KITANO, Y OTSUKA

COMBUSTION SCIENCE AND TECHNOLOGY　57　(1-3)　17-36　1988

DOI： 10.1080/00102208808923941 　

ISSN： 0010-2202
Flame Length and Soot Limit of Coflow Diffusion Flames under Interference Conditions

Michio Kitano, Hideaki Kobayashi, Yutaka Ohbuchi

The Technology Reports of the Tohoku University　57　(1)　1987/09
A Study on the Extinction of a Stretched Cylindrical Premixed Flame Peer-reviewed

KOBAYASHI Hideaki

Transaction of the Japan Society of Mechanical Engineers　52　(483)　3811-3817　1986
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.52.3811 　

ISSN： 0387-5016

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For the basic investigation of a premixed flame subjected to the effects of both flame stretch and flame curvature, we took up the stretched cylindrical flame formed inside the porous cylinder when the mixture was ejected uniformly from the inner wall surface of it. With methane/air and propane/air mixtures, flame behavior observations and measurements of extinction limit and flame diameter were made for these flames, and the effects of flame stretch and flame curvature were discussed, including those of heat loss to the burner wall, buoyancy, and Lewis numbers of reactants. Theoretical analysis was also made and extinction limits of the cylindrical flame and counter-flow twin flames, which have no flame curvature effects, were calculated and compared. The results showed that the curvature of the cylindrical flame propagating outward weakness resistibility to the flame extinction due to stretch.

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Misc. 74

Emission Characteristics of Liquid Ammonia and Gaseous Ammonia Flames Co-fired with Gaseous Hydrogen in a Gas Turbine-like Combustor at Moderately High Pressure

SOMARATHNE Kapuruge Don Kunkuma Amila, YAMASHITA Hirofumi, COLSON Sophie, HAYAKAWA Akihiro, KUDO Taku, KOBAYASHI Hideaki

Proceedings. International Conference on Flow Dynamics (CD-ROM)　19th　2022
Study on the role of excess enthalpy in the stabilization of ammonia/air premixed flames in a swirling flow.

COLSON Sophie, SOMARATHNE Kapuruge Don Kunkuma Amila, SUGAWARA Daiki, HAYAKAWA Akihiro, KOBAYASHI Hideaki

燃焼シンポジウム講演論文集(CD-ROM)　59th　2021
Numerical Study on Effects of Ammonia Fuel Fraction in Liquid Ammonia/Hydrogen/air Co-combustion at High Pressure

SOMARATHNE Kapuruge Don Kunkuma Amila, COLSON Sophie, HAYAKAWA Akihiro, KOBAYASHI Hideaki

燃焼シンポジウム講演論文集(CD-ROM)　59th　2021
Liquid Ammonia Spray Characteristics Using a Hollow Cone Nozzle at Various Ambient Pressures

SOMARATHNE Kapuruge Don Kunkuma Amila, YAMASHITA Hirofumi, YAMASHITA Hirofumi, COLSON Sophie, HAYAKAWA Akihiro, KOBAYASHI Hideaki.

Proceedings. International Conference on Flow Dynamics (CD-ROM)　18th　2021
Numerical Investigation on Possibilities of Liquid Ammonia Spray Combustion in the Gas Turbine-like Combustors

SOMARATHNE Kapuruge Don Kunkuma Amila, HAYAKAWA Akihiro, KOBAYASHI Hideaki

燃焼シンポジウム講演論文集(CD-ROM)　58th　2020
Trial of Liquid Ammonia Spray Combustion for Gas Turbines

倉田修, OKAFOR Ekenechukwu Chijioke, 山下裕史, 山下裕史, 壹岐典彦, 辻村拓, 内田正宏, 伊藤慎太朗, 須田俊之, 早川晃弘, 小林秀昭

燃焼シンポジウム講演論文集(CD-ROM)　58th　2020
カーボンフリーエネルギーキャリア利用における科学と技術

小林秀昭, 橋本望, 小原拓, 内一哲哉, 高木敏行, 丸田薫, 中村寿, 早川晃弘, 渡邉豊

東北大学流体科学研究所共同利用・共同研究拠点流体科学国際研究教育拠点活動報告書　2017　199‐200　2019/02
Effect of NH₃ Addition into CH₄/air Swirl Flames on NO Emission Characteristics

SOMARATHNE Kapuruge Don Kunkuma Amila, HAYAKAWA Akihiro, KOBAYASHI Hideaki

燃焼シンポジウム講演論文集(CD-ROM)　57th　2019
Dependence of unburnt ammonia on combustor inlet temperature of ammonia combustor of micro gas turbine

倉田修, 壹岐典彦, 井上貴博, 松沼孝幸, 辻村拓, 古谷博秀, 河野雅人, 新井啓介, OKAFOR Ekenechukwu Chijioke, 早川晃弘, 小林秀昭

日本機械学会動力・エネルギー技術シンポジウム講演論文集(CD-ROM)　24th　2019

ISSN： 2424-2950
Effect of Wall Heat Transfer on Emission Characteristics of Ammonia/air Swirling Flames in a Gas Turbine-like Combustor

SOMARATHNE Kapuruge Don Kunkuma Amila, HAYAKAWA Akihiro, KOBAYASHI Hideaki

Proceedings. International Conference on Flow Dynamics (CD-ROM)　15th　2018
Effect of Wall Quenching of a Gas Turbine-like Combustor on Emission Characteristics of Ammonia/air Non-premixed Swirling Flames

SOMARATHNE Kapuruge Don Kunkuma Amila, HAYAKAWA Akihiro, KOBAYASHI Hideaki

燃焼シンポジウム講演論文集　56th　2018
Research and Development of Ammonia Combustion, Low-NOx, Rich-lean, Gas Turbine Combustor

倉田修, 壹岐典彦, 井上貴博, 辻村拓, 古谷博秀, 河野雅人, 新井啓介, Ekenechukwu Chijioke Okafor, 早川晃弘, 小林秀昭

燃焼シンポジウム講演論文集　56th　2018
アンモニア燃焼ガスタービンにおける低NOx Rich-lean燃焼器の研究開発

壹岐典彦, 倉田修, 井上貴博, 松沼孝幸, 辻村拓, 古谷博秀, 河野雅人, 新井啓介, OKAFOR Ekenechukwu Chijioke, 早川晃弘, 小林秀昭

日本ガスタービン学会定期講演会講演論文集(CD-ROM)　46th　2018

ISSN： 2432-6739
A Study of Cavity Flame Holder with a Pylon in Supersonic Flow

60　5p　2016/09/06
Publisher: 日本航空宇宙学会
ISSN： 1884-1945
F134 Laminar Combustion Characteristics of Methane/ammonia/air Premixed Flames

Ichikawa Akinori, Kitagawa Yuichi, Kudo Taku, Hayakawa Akihiro, Kobayashi Hideaki

Procee[d]ings of Thermal Engineering Conference　2015　"F134-1"-"F134-2"　2015/10/23
Publisher: The Japan Society of Mechanical Engineers

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Hydrocarbon-ammonia combustion is a potential phase-in of CO_2 reduction for large scale energy systems. In this study, chemiluminescence spectrum of flame, laminar burning velocity and exhaust gas of methane/ammonia/air premixed flames were investigated varying with ammonia concentration in fuel. NH_2 α band spectrum was observed and flames became orange with the increase in the amount of ammonia in fuel. The laminar burning velocity decreased with the increase in ammonia in fuel. CO concentration in burned gas decreased with the increase in ammonia in fuel. NO concentration rapidly increased when ammonia ratio increased from 0 % to 5 %, then NO concentration gradually changes when ammonia ratio increased furthermore.
I125 Combustion Characteristics of Ammonia/air Premixed Flames with Hydrogen Addition

Kitagawa Yuichi, Ichikawa Akinori, Kudo Taku, Hayakawa Akihiro, Kobayashi Hideaki

Procee[d]ings of Thermal Engineering Conference　2014　"I125-1"-"I125-2"　2014/11/08
Publisher: The Japan Society of Mechanical Engineers

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Ammonia is expected as a hydrogen energy carrier and a carbon-free fuel. Because the combustion intensity of ammonia is weaker than that of hydrocarbon fuels, improvement of combustion intensity is required. In this study, combustion characteristics of ammonia/hydrogen/air flames were investigated using a constant volume combustion chamber and a nozzle-type burner. The laminar burning velocity monotonically increases with hydrogen addition. The Markstein length varies non-monotonically with hydrogen addition. The scale of turbulent flame front wrinkles of smaller hydrogen concentration flames are larger than that of higher ones because of thicker flame thickness of smaller hydrogen concentration flame.
G0610306 Laminar Flame Characteristics of Spherically Propagating Premixed Ammonia/air Flames

MIMOTO Rentaro, HAYAKAWA Akihiro, GOTO Takashi, KUDO Taku, KOBAYASHI Hideaki

Mechanical Engineering Congress, Japan　2014　"G0610306-1"-"G0610306-5"　2014/09/07
Publisher: The Japan Society of Mechanical Engineers

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Ammonia is expected to be not only as a hydrogen energy carrier but also as a carbon-free fuel. However, few studies of ammonia flame have been studied because of its lower combustion intensities. In this study, laminar burning velocity and Markstein length of ammonia/air premixed flames were experimentally evaluated from spherically propagating laminar flames. Equivalence ratios were varied from 0.7 to 1.3 and initial mixture pressure was set to 0.1 MPa. Spherically propagating laminar flames in a constant volume combustion chamber were observed by Schlieren photography with a high-speed camera. As a result, unstretched laminar burning velocities obtained in this study were slower than 8 cm/s for all examined equivalence ratios. The Markstein length increased with the increase in equivalence ratio. At the conditions of equivalence ratio of 0.8 and 0.9, Markstein lengths were negative. The numerical simulation using CHEMKIN-PRO with detailed reaction mechanisms were also performed. The reaction mechanisms must be improved in order to predict the unstretched laminar burning velocity of ammonia/air premixed flames.
A223 Turbulent Premixed Flame Structure of Propanol Isomers in a High-pressure Environment

Uchida Tomohiro, Souyoshi Shungo, Kudo Taku, Hayakawa Akihiro, Kobayashi Hideaki, Kadowaki Satoshi

Procee[d]ings of Thermal Engineering Conference　2013　311-312　2013/10/18
Publisher: The Japan Society of Mechanical Engineers

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For practical application of high carbon number biofuel, experiments of propanol isomers and propane turbulent premixed flame using OH-PLIF measurement were performed in a high pressure environment. The local flame surface density, Σ_<local>, for each fuel was analyzed from instantaneous turbulent flame images of cross-section. The results of Σ_<local> analysis indicated differences of intrinsic flame instability for 1-propanol, 2-propanol and propane. In addition, numerical simulations of propanol and propane laminar premixed flames using CHEMKIM-PRO were carried out to clarify the relationship between chemical reaction and flame instability. It was presumed that turbulent flame structure is affected by the diffusive thermal effects related to concentrations of the intermediate species, C_2H_2 and C_2H_4, depending of fuels and differences in dissociation reaction pathway.
110 The Effect of Hydrogen Concentration on Turbulent Premixed Flame Structures for Syngas at High Pressure

SATO Ryota, MATSUNO Futoshi, KUDO Taku, KOBAYASHI Hideaki

2013　(48)　24-25　2013/03/15
Publisher: The Japan Society of Mechanical Engineers
C134 Flame stabilization mechanism of coaxial oxygen-jet diffusion flame in a high-pressure environment

Shirakawa Shun, Kumagami Manabu, Kudo Taku, Kobayashi Hideaki

Procee[d]ings of Thermal Engineering Conference　2012　93-94　2012/11/16
Publisher: The Japan Society of Mechanical Engineers

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To clarify the stabilization mechanism of coaxial oxygen-jet diffusion flames, experiments on the measurement of flame base position and stream lines near the burner lip were performed. It was found that, at high pressure, flame base located in the recirculation zone near the lip, while, at atmospheric pressure, it located downstream of the recirculation zone. This means that the stabilization of the flame base at high pressure is dominated by the existence of the recirculation zone and that at atmospheric pressure is determined by the balance between the local gas velocity and burning velocity of the premixed gas formed by diffusion. Therefore, the stabilization mechanism changes depending on the ambient pressure.
0516 Numerical Analysis on High-Temperature Premixed Flames:Effects of Unburned-Gas Temperature and Lewis Number on Intrinsic Instability

OSHIMA Takuya, KOBAYASHI Hideaki, KADOWAKI Satoshi

2012　(49)　51601-51602　2012/03/01
Publisher: The Japan Society of Mechanical Engineers
F122 On the Characteristics of Turbulent Combustion for Model Coal-gasification Syngas with Pure Oxygen at High Pressure

Wang Jinhua, Otawara Yuki, Matsuno Futoshi, Kobayashi Hideaki, Ogami Yasuhiro, Kudo Taku, Okuyama Masaki

Procee[d]ings of Thermal Engineering Conference　2011　135-136　2011/10/28
Publisher: The Japan Society of Mechanical Engineers

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An experimental study of turbulent premixed flames for the CO-H_2-CO_2-O_2 mixtures as a model of syngas oxyfuel combustion was investigated at high pressure. Results showed that the flame front structure of CO-H_2 flames is much fine and have smaller scale compared to CH_4-air flame. The CO-H_2 flames with narrow heat release region tend to be combustion oscillation at premixed-type gas turbine combustor. The bending of S_T/S_L with u'/S_L is not observed for CO-H_2-CO_2-air flames, while, it was observed for other flames and this would be due to the wrinkle of the flame front by turbulence was limited by the flame intrinsic instability.
F121 A Study on Reaction Mechanism of Ethanol Premixed Flame at Elevated Pressure and Elevated Temperature

Ogami Yasuhiro, Ozeki Masato, Okuyama Masaki, Suzuki Takuro, Kobayashi Hideaki

Procee[d]ings of Thermal Engineering Conference　2011　133-134　2011/10/28
Publisher: The Japan Society of Mechanical Engineers

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Laminar burning velocities for ethanol/air premixed flames were measured in elevated pressure and elevated temperature conditions by using the local angle method which employs particle tracking velocimetry (PTV) to Bunsen flames. Experimental data of laminar burning velocities were compared with numerical results calculated using detailed chemical reaction mechanisms for ethanol oxidation, i.e., the mechanism by Marinov and the mechanism by Saxena and Williams, and the validation of the existing chemical reaction mechanisms was performed under high pressure and high temperature conditions.
311 Numerical Analysis of High-Temperature Premixed Flames under the Constant-Enthalpy Conditions:Lewis Number Effects on Intrinsic lnstability

YAHATA Masafumi, KOBAYASHI Hideaki, KADOWAKI Satoshi

2011　(48)　93-94　2011/03/01
Publisher: The Japan Society of Mechanical Engineers
高圧下における石炭改質模擬ガスを燃料とするCO/H₂/CO₂/air乱流予混合火炎に関する研究

市川泰久, 大田原佑樹, 奥山昌紀, 工藤琢, 大上泰寛, 小林秀昭, 門脇敏

燃焼シンポジウム講演論文集　48th　80-81　2010/11/20
Numerical Simulation on the Intrinsic Instability of High-Temperature Premixed Flames Under the Constant-Enthalpy Conditions

KADOWAKI Satoshi, YAHATA Masafumi, KOBAYASHI Hideaki

Journal of the Combustion Society of Japan　52　(162)　329-334　2010/11/15
Publisher: 日本燃焼学会
ISSN： 1347-1864
E132 A Study on Reaction Mechanism of CH_4/O_2/H_2O Premix Flame in High-pressure and Fuel-rich Condition

Ogami Yasuhiro, Kumagami Manabu, Kobayashi Hideaki

Procee[d]ings of Thermal Engineering Conference　2010　137-138　2010/10/29
Publisher: The Japan Society of Mechanical Engineers

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Measurements of laminar burning velocities for CH_4/O_2/H_2O premixed flames were conducted under fuel-rich and high-pressure conditions using a Bunsen-type flame. Experimental data of laminar burning velocities were compared with numerical results calculated using detailed chemical reaction mechanisms, and the verification for the feasibility of the reaction mechanisms was performed under specific conditions such as high equivalence ratio, high pressure, and high steam dilution. Sensitivity analysis and reaction pathway analysis were also conducted, and the effects of steam dilution and fuel-rich conditions on chemical reactions for CH_4 oxidation were investigated.
E131 The Effects of the Lewis Number on the Intrinsic Instability of High-Temperature Premixed Flames

Yahata Masafumi, Kobayashi Hideaki, Kadowaki Satoshi

Procee[d]ings of Thermal Engineering Conference　2010　135-136　2010/10/29
Publisher: The Japan Society of Mechanical Engineers

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This paper treated high-temperature premixed flames to study the effects of the Lewis number on intrinsic instability under the constant-enthalpy conditions. The growth rate increased as the unburned-gas temperature became higher, which was due to the increase in burning velocity of a planar flame. In addition, the unstable range widened and the maximum growth rate increased as the Lewis number became lower, which was due to the diffusive-thermal effects. To elucidate the characteristics of cellular flames induced by intrinsic instability, a disturbance with the critical wave number was superimposed. The superimposed disturbance evolved, and then a cellular flame front formed. When the unburned-gas temperature was high, the behavior of cellular flames was mild. This was because that the difference in temperature between burned and unburned gases decreased.
1204 The combined effects of intrinsic instability and radiation on the dynamics of premixed flames propagating in non-uniform velocity field

TAKAHASHI Hidekazu, KADOWAKI Satoshi, KOBAYASHI Hideaki

2010　(47)　441-442　2010/03/05
Publisher: The Japan Society of Mechanical Engineers
E112 Flame Structure of CO/H_2/C_2/air Turbulent Premixed Flames in a High Pressure Environment

kobayashi Hideaki, Ichikawa Yasuhisa, Otawara Yuki, Ogami Yasuhiro, Kudo Taku, Okuyama Masaki, Kadowaki Satoshi

The Proceedings of the Thermal Engineering Conference　2010　(0)　121-122　2010
Publisher: The Japan Society of Mechanical Engineers

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Experimental study of turbulent premixed flames for CO/H_2/CO_2/air mixture as a model of coal gasification syngas in a high pressure environment was performed up to 1.0 MPa. Flame structure and turbulent burning velocity were analyzed using OH-PLIF images. Results showed that very fine cusps were seen for CO/H_2/CO_2/air flames, these small cusps being generated on a large scale wrinkled flame front even for low u'/SL. Flame surface density of CO/H_2/CO_2/air flames was higher than that of CH_4/air flames, while the mean volume of the turbulent flame region was smaller.
高温高圧下におけるCO₂およびH₂O希釈乱流予混合火災の局所曲率と幾何学的構造に関する研究

市川泰久, 矢田創一郎, 大上泰寛, 小林秀昭

燃焼シンポジウム講演論文集　47th　50-51　2009/11/18
ペブル充填層における高圧乱流燃焼メカニズムに関する研究

奥山昌紀, 大上泰寛, 市川泰久, 熊上学, 小林秀昭

燃焼シンポジウム講演論文集　47th　424-425　2009/11/18
A133 The Mechanism of Burning Rate Constant Enlargement of a Fuel Droplet in Varying Forced Convection at High Pressure

Jansi Mehdi, Ogami Yasuhiro, Kobayashi Hideaki

Procee[d]ings of Thermal Engineering Conference　2009　21-22　2009/11/06
Publisher: The Japan Society of Mechanical Engineers

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The mechanism of burning rate enhancement for a single droplet flame in varying forced convection at high pressure previously found in our microgravity experiments was numerically investigated. The excellent agreement on the unsteady behavior of droplet combustion between experimental results and numerical ones were obtained. It was shown that a toroidal vortex formed downstream of the droplet at high pressure pushes back the flame in the wake region and heats the droplet, and thus enlarges evaporation rate of the droplet, as well as in the stagnation region upstream of the droplet.
2-D Ethanol Premixed and Diffusion Flame Calculations using a Reduced Kinetic Mechanism

OKUYAMA Masaki, HIRANO Shinichiro, KAWASE Masao, OGAMI Yasuhiro, NAKAMURA Hisashi, KOBAYASHI Hideaki

2009　88-88　2009
Publisher: 日本流体力学会

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Numerical simulations of ethanol combustion with a reduced kinetic mechanism were performed for two-dimensional Bunsen flames and diffusion flames. A reduced kinetic mechanism was generated based on the quasi-steady-state assumption (QSSA) using the Computational Singular Perturbation (CSP) method and its validity and the application range were tested using one-dimensional premixed flame calculations prior to the 2-D simulations. Numerical results, i.e., temperature, chemical species profiles of the detailed mechanism and reduced kinetic mechanism were in good agreement for both 2-D Bunsen and diffusion flame, which showed the validity of the reduced kinetic mechanism of the present study. Bunsen flame calculations showed the large reduction of calculation cost when the reduced mechanism was used. Two-dimensional diffusion flame calculations also showed the advantage of a reduced kinetic mechanism over In-situ Adaptive Tabulation (ISAT) method.
高温高圧下における水蒸気希釈乱流予混合火炎の構造と排出ガス特性

矢田創一郎, 市川泰久, 大上泰寛, 小林秀昭

燃焼シンポジウム講演論文集　46th　436-437　2008/11/20
On the New Paper-selection Process for the International Combustion Symposium

KOBAYASHI Hideaki

Journal of the Combustion Society of Japan　50　(154)　337-339　2008/11/15
Publisher: 日本燃焼学会
ISSN： 1347-1864
On the validity of quasi-steady assumption in transient droplet combustion (vol 155, pg 409, 2008)

M. Jangi, S. Sakurai, Y. Ogami, H. Kobayashi

COMBUSTION AND FLAME　155　(3)　409-409　2008/11

DOI： 10.1016/j.combustflame.2008.10.014 　

ISSN： 0010-2180

eISSN： 1556-2921
Characteristic Length of the Downstream Recirculation Zone of Wall Injection Interacting with Incident Shock Wave

Y. Sakimitsu, S. Ishida, H. Nakamura, Y. Ogami, H. Kobayashi

5th International Conference on Flow Dynamics　2008
Effect of an Incident Shock Wave on the Flow Field with Wall Injection Normal to the Supersonic Mainstream

Y. Sakimitsu, S. Ishida, H. Nakamura, Y. Ogami, H. Kobayashi

Proceedings of the 3rd Tohoku-SNU Joint Workshop on Next Generation Aero Vehicle　1　78-81　2008
Pyrolysis and Combustion of Polymers in Stagnation-point Flow Diluted with H(2)O and CO(2)

Kentaro Yoshinaga, Makoto Mori, Yasuhiro Ogami, Hideaki Kobayashi

PROCEEDINGS OF THE NINTH ASIA-PACIFIC INTERNATIONAL SYMPOSIUM ON COMBUSTION AND ENERGY UTILIZATION　1　91-101　2008
Unsteady Behavior of Single Droplet Combustion in Oscillatory Flow Field under Microgravity Condition

Y. Ogami, S. Sakurai, S. Hasegawa, M. Jangi, H. Nakamura, K. Yoshinaga, H. Kobayashi

The Eighth International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration　88-89　2008
E224 On the Response of Single Droplet Combustion to Oscillatory Flow at High Pressure in Microgravity

Kobayashi Hideaki, Hasegawa Shoichi, Ogami Yasuhiro, Jangi Mehdi, Yoshinaga Kentato, Nakamura Hisasi

Procee[d]ings of Thermal Engineering Conference　2007　337-338　2007/11/23
Publisher: The Japan Society of Mechanical Engineers

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To elucidate characteristics of a droplet flame as an elementary process of turbulent spray combustion, droplet combustion experiments in varying forced convection at high pressure were performed in microgravity. 1-butanole was used as a fuel and the maximum pressure was 1.0MPa. High-speed back lit images of burning droplet were obtained and time history of the droplet diameter was measured using image processing. Results showed that maximum velocity in oscillating flow is predominant for the burning rate constant, meaning that the classical quasi-steady assumption is not valid. Mechanism of this droplet combustion characteristic was discussed based on the ratio of characteristic time scales of flow oscillation and gas diffusion.
C232 Effects of Hydrogen Addition on Premixed Combustion in a High-Pressure Environment

Kobayashi Hideaki, Kaneko Hideaki, Yata Soichirou, Ogami Yasuhiro

Procee[d]ings of Thermal Engineering Conference　2006　301-302　2006/11/23
Publisher: The Japan Society of Mechanical Engineers

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Experiments were performed for turbulent premixed flames of CH_4/air/H_2/ mixtures at high pressure to investigate the effects of hydrogen addition on turbulent combustion characteristics. OH-PLIF measurements were conducted to determine the effective Lewis numbers, turbulent burning velocity, smallest scale of flame wrinkles, and local flame surface density. Results showed that the decrease in the effective Lewis number for hydrogen addition ratio of 0.1 is small and mean volume of the flame region and the smallest scale were not affected by H_2 addition. However, ST/SL slightly increased, corresponding to the increase in the flame surface density possibly due to the increase in the grows rate of the intrinsic flame instability.
(7)Effects of Turbulence on Flame Structure and NOx Emission of Turbulent Jet Non-Premixed Flames in High-Temperature Air Combustion

CHO Eun-Seong

Journal of the Japan Society of Mechanical Engineers　109　(1050)　349-349　2006/05/05
Publisher: The Japan Society of Mechanical Engineers
ISSN： 0021-4728
Laminar burning velocity of stoichiometric CH4/air premixed flames at high-pressure and high-temperature

Yasuhiro Ogami, Hideaki Kobayashi

JSME International Journal, Series B: Fluids and Thermal Engineering　48　(3)　603-609　2006/02/15

DOI： 10.1299/jsmeb.48.603 　

ISSN： 1340-8054
B134 A Study of Dilution Effects of Turbulent Premixed Flames with CO_2

Kobayashi Hideaki, Hagiwara Hirokazu, Kaneko Hideaki, Ogami Yasuhiro

Procee[d]ings of Thermal Engineering Conference　2005　67-68　2005/11/02
Publisher: The Japan Society of Mechanical Engineers

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Experiments were performed for turbulent premixed flames of methane/CO_2-diluted-air mixture at pressure ranging from atmospheric pressure to high pressure up to 1.0MPa and mixture temperatures of 300K and 573K, which covers the typical operating conditions of premixed-type gas-turbine combustors. Bunsen-type flame was stabilized in a high pressure chamber and OH-PILF visualization was performed. Using the OH-PLIF images, contours of the mean progress variable were determined assuming flamelet regime, and turbulent burning velocity and time-and-space-averaged fuel consumption rate in the flames were measured. Results showed that the time-and-space averaged fuel consumption rate became small by the CO_2 dilution. It is mainly due to the increase in the volume of flame region, meaning suitable conditions for eliminating the combustion instability in premix-type gas turbine combustors.
905 Transdisciplinary Approach to Supersonic Flow Dynamics using Particle Tracking Velocimetry and Numerical Simulation

Nakamura Hisashi, Sato Naoki, Kobayashi Hideaki, Masuya Goro

Fluids engineering conference ...　2005　137-137　2005/10/28
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882
Effects of turbulence on flame structure and NOx emission of turbulent jet non-premixed flames in high-temperature air combustion

H Kobayashi, K Oono, ES Cho, H Hagiwara, Y Ogami, T Niioka

JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING　48　(2)　286-292　2005/05

DOI： 10.1299/jsmeb.48.286 　

ISSN： 1340-8054
911 Dynamic behavior of premixed flames propagating in non-uniform flow fields by intrinsic Instability

SUZUKI Hiroshi, KADOWAKI Satoshi, KOBAYASHI Hideaki

2005　(42)　305-306　2005/03/01
Publisher: The Japan Society of Mechanical Engineers
Relationship between Turbulent Burning Velocity and Intrinsic Flame Instability a High Pressure and High Temperature

HAGIWARA Hirokazu, KANEKO Hideaki, OGAMI Yasuhiro, KOBAYASHI Hideaki

Procee[d]ings of Thermal Engineering Conference　2004　303-304　2004/11/10
Publisher: The Japan Society of Mechanical Engineers

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Burning velocities of methane/air mixture at pressure ranging from atmospheric pressure to high pressure up to 1.0 MPa and mixture temperatures of 300 K and 573 K were measured for Bunsen-type flame stabilized in a high pressure chamber using OH-PILF. Based on the contours of the mean progress variable, <c>, turbulent burning velocity was determined. Bending tendency of S_T/S_L curves with u'/S_L was also seen at high pressure and temperature. The turbulence Reynolds number region where the bending occurs corresponded well to the region where the smallest scale of flame wrinkling measured as a fractal inner cutoff approaches the characteristic flame instability scale. Flame instability for the flow without turbulence was also measured and the increase in nominal burning velocity was confirmed at high pressure and high temperature.
A Study of Turbulent Flame Structure in High-Temperature Air Combustion

OONO Ken, Cho Eun-Seong, KOBAYASHI Hideaki, HAGIWARA Hirokazu, OGANII Yasuhiro, NIIOKA Takashi

2004　(40)　173-174　2004/09/17
Publisher: The Japan Society of Mechanical Engineers
Droplet Combustion Experiment in Varying Flow Field Using Microgravity Environment

KOBAYASHI Hideaki, MITSUYA Masaki, HANAI Hironao

Procee[d]ings of Thermal Engineering Conference　2003　225-226　2003/11/10
Publisher: The Japan Society of Mechanical Engineers

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For the purpose of exploring the fundamental phenomenon of spray turbulent combustion, this research aims to investigate interactions between droplet flames and vortex tubes composing coherent structure of turbulence using a model based on a droplet flame in varying forced convection. A fuel droplet is placed at the focusing point of the swinging forced convection apparatus installed in a high-pressure combustion chamber. An analogy between the interaction and the model was discussed in order to determine the experimental condition. Experimental apparatus for microgravity experiment was developed and tested using MGLAB dropshaft, finding a response of instantaneous burning rate constant to the varying flow.
TED-AJ03-608 EXTINCTION OF THE COUNTERFLOW DIFFUSION FLAME OF BLENDED FUELS :

Tomohiro Denda, Maruta Kaoru, Kobayashi Hideaki, Niioka Takashi

Proceedings of the ... ASME/JSME Thermal Engineering Joint Conference　2003　(6)　131-131　2003
Publisher: 日本機械学会

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For applications of the high-temperature air combustion technology (HiCOT) to waste incinerators, diffusion flames of blended fuel gases and high-temperature air in the stretch flow field were investigated. In this study, extinction limits of the counterflow diffusion flame for CH_4-C_3H_8 blended fuel gases were obtained experimentally and numerically, varying the mixture fraction, fuel concentration, air temperature, and flame stretch rate. Since the flame is unable to stabilize at small stretch rates due to the natural convection caused by buoyancy under normal gravity condition, the experiments were performed under microgravity condition using JAMIC dropshaft in Hokkaido, Japan. Numerical analysis was performed considering detail chemistry and radiative heat loss using the optically thin model. Experimental and numerical results showed that, when the blended fuel is used air temperature is increased, extinction limits are expanded (Figs. A-1 and A-2). As increasing air temperature, however, the extinction limits at low stretch rates are not expanded as much as those at high stretch rates. This reason is presumed as follows : At the high stretch rate region in which the so-called stretch extinction occurs, Damkohler number becomes small and the flame temperature decreases rapidly, so that flame extinguishes; that is, the characteristic chemical reaction time becomes longer than the characteristic flow time. As the air temperature is elevated, the reaction rate increases according to the Arrhenius law. As a result, combustion stabilization is significantly improved and the extinction limit on the high stretch rate side is expanded largely. On the other hand, so-called radiation extinction occurs on the low stretch rate side, owing to a wide flame region with high temperature. The reaction rate increases when the air temperature increases and therefore the extinction limit must be expanded as well. Radiation heat loss, however, also increases in proportion to temperature to the power 4,since the flame temperature becomes higher as the air temperature increases. This is the reason why the extinction limit does not so much expand in low stretch rates as it expands in high stretch rates.[figure]
TED-AJ03-375 A STUDY OF LAMINAR BURNING VELOCITY FOR H_2/O_2/He PREMIXED FLAME AT HIGH PRESSURE AND HIGH TEMPERATURE :

OGAMI Yasuhiro, KOBAYASHI Hideaki

Proceedings of the ... ASME/JSME Thermal Engineering Joint Conference　2003　(6)　336-336　2003
Publisher: 日本機械学会

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Experimental and numerical studies on laminar burning velocities of a stoichiometric H_2/O_2He mixture were performed in a pressure range of 0.1 to 1.0MPa and in a mixture temperature range of 300 to 500K. The H_2/O_2 mixture was diluted by helium to the helium dilution ratio of 82% in volume in order to increase Lewis number of hydrogen more than unity and to decrease laminar burning velocity to restrain flame instabilities. Flames were kept stable in the all of the experimental conditions due to the increase of Lewis number which enhances diffusive-thermal effect to stabilize Darrieus-Landau instability occurring at elevated pressure, and due to the decrease of laminar burning velocity which lessens Darrieus-Landau instability. Measurements of laminar burning velocity were conducted using particle tracking velocimetry (PTV) combined with planar laser induced fluorescence of OH radical (OH-PLIF) for burner-stabilized flames in a high-pressure combustion chamber. This technique provides the information of instantaneous local burning velocities in the all region of flame, and the laminar burning velocities were determined using the laminar burning velocities in the region outside of the boundary layer and far from the flame tip, indicating flame stretch and curvature are almost zero. Numerical simulations were also conducted using one-dimensional premixed flame code, and their results were compared with experimental results in order to verify the existing H_2/O_2 detailed reaction mechanisms in a high-pressure and high-temperature environment. Modification of the reaction mechanism was also performed in order to correct the reduction ratio of laminar burning velocity with respect to ambient pressure for various temperatures of the mixture. The numerical results using modified reaction mechanism were in good agreement with experimental results in terms of the pressure dependency of laminar burning velocity for the preheated mixture up to 500K.[figure]
High-Temperature Air Combustion Technology

KOBAYASHI Hideaki

Journal of the Japan Society of Mechanical Engineers　105　(1006)　598-599　2002/09/05
Publisher: The Japan Society of Mechanical Engineers
ISSN： 0021-4728
Experimental study of high-pressure turbulent premixed flames

H Kobayashi

EXPERIMENTAL THERMAL AND FLUID SCIENCE　26　(2-4)　375-387　2002/06

DOI： 10.1016/S0894-1777(02)00149-8 　

ISSN： 0894-1777

eISSN： 1879-2286
高温空気燃焼技術－省エネルギーと低NOx化の限界に挑戦－

小林秀昭

日本機械会誌　105　158-159　2002
Extinction of Counterflow Diffusion Flame of blended Fuels under Microgravity

DENDA Tomohiro, MARUTA Kaoru, KOBAYASHI Hideaki, NIIOKA Takashi

18　21-21　2001/10/01

ISSN： 0915-3616
Flame Propagation of Spray in Microgravity

NUNOME Yoshio, KATO Soichiro, MARUTA Kaoru, KOBAYASHI Hideaki, NIIOKA Takashi

18　15-15　2001/10/01

ISSN： 0915-3616
Effects of Droplet Inner Flow on Flame Spread of a Fuel Droplet Array in a High-Pressure Environment

KOBAYASHI Hideaki, IWAHASHI Takeshi, NIIOKA Takashi

2001　497-498　2001
Publisher: 日本流体力学会
ISSN： 1342-8004

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The generation mechanism of the fuel-vapor jet and the increase in flame spread rate of a droplet array observed in a high pressure and microgravity environment were investigated. Based of the expected mechanism of fuel-vapor jet, internal convection rate of the suspended droplet before ignition was measured. Results showed that the internal convection rate increased with pressure and had the maximum near the critical pressure. This agrees with the effect of pressure on Marangoni convection of the droplet surface which induces the flow of the fuel vapor near the droplet surface.
Research of combustion phenomena in a high-pressure environment

Hideaki Kobayashi

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　66　(645)　1257-1263　2000
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.66.1257 　

ISSN： 0387-5016
Relationship between Turbulent Burning Velocity and Flame Instability at High Pressure

KOBAYASHI Hideaki, KAWAZOE Hiroyuki

18　301-302　1999/07/29

ISSN： 1342-8004
International Workshop on Turbulent Reacting Flames. Effects of Mixture Properties on Turbulent Burning Velocity and General Correlation in a High-Pressure Environment.

小林秀昭, 川端康晴, 丸田薫

燃焼の科学と技術　6　(Supplement)　139-148　1999/03
Publisher: サイエンス・コミュニケーションズ・インターナショナル
ISSN： 0918-5712
層流火炎における速度場計測

小林秀昭

燃焼の科学と技術　5　195-206　1999
Flame Spread of Fuel Droplet Array in Microgravity and High-Pressure Environment

PARK Jeong, IWAHASHI Takeshi, KOBAYASHI Hideaki, NIIOKA Takashi

15　77-78　1998/10/01

ISSN： 0915-3616
Flame Behavior near Lean Flammability Limit of Particle-Cloud Combustion in Microgravity Field.

花井宏尚, 丸田薫, 小林秀昭, 長谷川進, 新岡嵩

燃焼の科学と技術　5　(4)　303-313　1998/04

ISSN： 0918-5712
Microgravity Experiments on Ignition of Droplet Matrix.

門脇徹, 丸田薫, 長谷川進, 小林秀昭, 新岡嵩

日本マイクログラビティ応用学会誌　14　(1)　17-24　1997
Publisher: 日本マイクログラビティ応用学会
ISSN： 0915-3616
乱流と火炎の干渉に関する実験と考察

小林秀昭

ながれ　16　(5)　398-403　1997
Publisher: The Japan Society of Fluid Mechanics
DOI： 10.11426/nagare1982.16.398 　

ISSN： 0286-3154
Experiment on Flame Spread of a Fuel Droplet Array in High-Pressure Ambience

KATO Shinichiro, MIZUNO Hiroyuki, KOBAYASHI Hideaki, NIIOKA Takashi

13　(4)　347-348　1996/10/31

ISSN： 0915-3616
Experimental method of Low-speed Flow and its Application to counterflow flame

MARUTA Kaoru, YOSHIDA Masaharu, KOBAYASHI Hideaki, NIIOKA Takashi

12　(4)　325-326　1995/10/31

ISSN： 0915-3616
高圧燃焼反応流試験装置

小林秀昭, 丸田薫, 長谷川進, 田村崇, 新岡嵩

東北大学流体科学研究所報告　6　1-14　1995
Publisher: Tohoku University
ISSN： 0916-2860
伸長円筒状火炎の消炎と乱流予混炎の火炎片構造について

小林秀昭, 北野三千雄

燃焼の科学と技術　2　27-38　1994
超音速流における衝撃波入射による水素保炎の研究

藤森俊郎, 村山元英, 長谷川進, 小林秀昭, 新岡嵩

燃焼の科学と技術　1　(3)　211-213　1993
超音速燃焼試験設備

新岡嵩, 長谷川進, 塚本達郎, 小林秀昭, 寺田健一

東北大学流体科学研究所報告　3　1-13　1992

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Books and Other Publications 3

機械工学便覧基礎編α５熱工学

小林秀昭

丸善　2006
燃焼現象の基礎（新岡嵩，河野通方，佐藤順一編著）

小林秀昭

2002
Effects of Flame Stretch and Curvature on Combustion Characteristics, Handbook of Heat and Mass Transfer, Volume 4: Advances in Reactor Design and Combustion Science (N.P.Cheremisinoff Ed.), Chapter 19

Hideaki Kobayashi, Michio Kitano

1990

Presentations 337

希薄アンモニア／水素／空気層流予混合火炎のN2O生成メカニズムに関する研究

早川晃弘, 林雅生, M. Kovaleva, G.J. Gotama, E.C. Okafor, S. Colson, Syed Mashruk, Agustin Valera-Medina, 工藤琢, 小林秀昭

第59回燃焼シンポジウム，オンライン開催　2021/11/24
層状噴射によるアンモニアディーゼル燃焼コンセプトの提案

市川泰久, 仁木洋一, 高崎講二, 小林秀昭, 三柳晃洋

第59回燃焼シンポジウム，オンライン開催　2021/11/24
液体アンモニア噴霧の非燃焼場における光学計測と旋回流燃焼器を用いた燃焼特性の解明

山下裕史, E.C. Okafor, S. Colson, K.D.K.A. Somarathne, 辻村拓, 伊藤慎太朗, 内田正宏, 工藤琢, 早川晃弘, 小林秀昭

第59回燃焼シンポジウム，オンライン開催　2021/11/24
OH(2,0)励起を用いた2方向LIF手法による火炎のOH濃度計測

樋口靖浩, 布目佳央, 富岡定毅, 冨田健夫, 工藤琢, 早川晃弘, 小林秀昭

第59回燃焼シンポジウム，オンライン開催　2021/11/24
Study on the role of excess enthalpy in the stabilization of an ammonia/air premixed flames in a swirling flow.

S. Colson, K.D.K.A. Somarathne, D. Sugawara, A. Hayakawa, H. Kobayashi

2021/11/23
Numerical Study on Effects of Ammonia Fuel Fraction in Liquid Ammonia/Hydrogen/Air Co-Combustion at High Pressure

K.D.K.A. Somarathne, S. Colson, A. Hayakawa, H. Kobayashi

2021/11/23
Effects of Atomizer Structure on Atomization and Combustion Characteristics of 3D-printed Metal Airblast Atomizers

Y. Imai, A. Shibazaki, T. Kudo, M. Uchida, Y. Komatsu, A. Hayakawa, H. Kobayashi

the Eighteenth International Conference on Flow Dynamics (ICFD 2021)　2021/10/28
Liquid Ammonia Spray Characteristics Using a Hollow Cone Nozzle at Various Ambient Pressures

K.D.K.A. Somarathne, H. Yamashita, S. Colson, A. Hayakawa, H. Kobayashi

the Eighteenth International Conference on Flow Dynamics (ICFD 2021),　2021/10/27
Effects of Combustor Wall Cooling on Liquid Ammonia Spray Combustion in a Micro Gas Turbine Combustor

E.C. Okafor, O. Kurata, H. Yamashita, T. Inoue, T. Tsujimura, N. Iki, A. Hayakawa, M. Uchida, S. Ito, H. Kobayashi

the Eighteenth International Conference on Flow Dynamics (ICFD 2021)　2021/10/27
Quantitative OH Concentration Measurement on Calibration Flat Flame Using Bi-directional OH(2,0) LIF

Y. Higuchi, Y. Nunome, S. Tomioka, T. Tomita, T. Kudo, A. Hayakawa, H. Kobayashi

the Eighteenth International Conference on Flow Dynamics (ICFD 2021)　2021/10/27
Local Stabilization Dynamics of a Methane/ammonia Non-premixed Jet Flame Up to Liftoff

S. Colson, M, Kuhni, A. Hayakawa, H. Kobayashi, C. Galizzi, D. Escudie

Proceedings of the Eighteenth International Conference on Flow Dynamics (ICFD 2021),　2021/10/27
Ammonia Direct Combustion Invited

H. Kobayashi

Eighteenth International Conference on Flow Dynamics (ICFD 2021)　2021/10/27
SLIPIによる液体アンモニア噴霧構造の可視化

山下裕史, E.C. Okafor, S. Colson, K.D.K.A. Somarathne, 辻村拓, 伊藤慎太朗, 内田正宏, 工藤琢, 早川晃弘, 小林秀昭

日本機械学会熱工学コンファレンス2021 オンライン開催　2021/10/10
OH(2,0)励起を用いた1次元定常火炎のOH濃度計測

樋口靖浩, 布目佳央, 富岡定毅, 冨田健夫, 工藤琢, 早川晃弘, 小林秀昭

日本機械学会東北支部第57期秋季講演会オンライン開催　2021/10/02
高圧環境下におけるアンモニア／水蒸気／空気予混合火炎の層流燃焼速度とMarkstein長さ

林雅生, 早川晃弘, 工藤琢, 小林秀昭

日本機械学会東北支部第57期秋季講演会オンライン開催　2021/10/02
Stability and Emissions Characteristics of Liquid Ammonia Spray Combustion in a Swirling Flow

H. Yamashita, E. C. Okafor, A. Hayakawa, T. Tsujimura, S. Ito, M. Uchida, T. Kudo, H. Kobayashi

European Power to Ammonia® Conference 2021　2021/06/04
Study of NO and N2O emissions from the combustion of liquid ammonia spray in swirl combustors

E.C. Okafor, H. Yamashita, A. Hayakawa, T. Tsujimura, T. Kudo, M. Uchida, S. Ito, H. Kobayashi

38th International Symposium on Combustion　2021/01/25
Study of instability and dynamic behavior of NH3-H2 premixed flame

S. Tabejamaat, S. Kadowaki, A. Hayakawa, H. Kobayashi, K.D.K. Somarathne

38th International Symposium on Combustion　2021/01/25
Product gas analysis of laminar premixed ammonia-methane flames in stagnation flows

M. Kovaleva, A. Hayakawa, T. Kudo, H. Kobayashi

38th International Symposium on Combustion　2021/01/25
A quantitative measurement of OH and flame temperature for a calibration burner operated at high-pressure and high-temperature

Y. Higuchi, Y. Nunome, S. Tomioka, T. Tomita, T. Kudo, A. Hayakawa, H. Kobayashi

38th International Symposium on Combustion　2021/01/25
Experimental and numerical study of product gas characteristics of ammonia/air premixed laminar flames stabilized in a stagnation flow

A, Hayakawa, Y. Hirano, E.C. Okafor, H. Yamashita, T. Kudo, H. Kobayashi

38th International Symposium on Combustion　2021/01/29
Effects of OH concentration nd temperature on NO emission characteristics of turbulent non-premixed CH4/NH3/air flames in a two-stage gas turbine like combustor at high pressure

K.D.K.A. Somarathne, E.C. Okafor, D. Sugawara, A. Hayakawa, H. Kobayashi

38th International Symposium on Combustion　2021/01/25
Turbulent flame propagation limits of ammonia/methane/air premixed mixture in a constant volume vessel

G. Hashimoto, K. Hadi, Y. Xia, A. Hamid, N. Hashimoto, A. Hayakawa, H. Kobayashi, O. Fujita

38th International Symposium on Combustion　2021/01/25
Influence of wall heat loss on the emission characteristics of premixed ammonia air swirling flames interacting with the combustor wall

E.C. Okafor, M. Tsukamoto, A.Hayakawa, K.D.K.A. Somarathne, T. Kudo, T. Tsujimura, H. Kobayashi

38th International Symposium on Combustion　2021/01/25
Numerical study of NH3-H2 premixed flame instability

S. Tabejamaat, S. Kadowaki, K.D. K. A. Somarathne, A. Hayakawa, H. Kobayashi

2020/12/04
Investigation of the Combustion of Liquid Ammonia Spray in a Single Stage Swirl Combustor

Ekenechukwu C. Okafor, Hirofumi Yamashita, Akihiro Hayakawa, K. D, K. A. Somarathne, T. Kudo, T. Tsujimura, M. Uchida, Shintaro Ito, H. Kobayashi

2020/12/04
Laminar Burning Velocity and Markstein Length of NH3/H2/Air Premixed Flames for Various Equivalence Ratios and Initial Pressures

G. J. Gotama, M. Hayashi, R. Kanoshima, A. Hayakawa, E. C. Okafor, T. Kudo, H. Kobayashi

2020/12/04
Effect of ammonia addition on a non-premixed methane jet flame in an air coflow

S. Colson, M. Kühni, C. Galizzi, D. Escudié, H. Kobayashi

2020/12/04
Numerical investigation on possibilities of liquid ammonia spray combustion in the gas turbine-like combustors

K.D.K.A. Somarathne, A. Hayakawa, H. Kobayashi

2020/12/04
GH2/GO2シングルエレメント同軸噴射器における火炎基部のOH-PLIF計測

樋口靖浩, 布目佳央, 富岡定毅, 冨田健夫, 工藤琢, 早川晃弘, 小林秀昭

第58回燃焼シンポジウム　2020/12/04
水素-空気予混合火炎の不安定挙動に及ぼす熱損失の影響：詳細な化学反応モデルに基づく数値計算

古山大誠, 河田一将, 勝身俊之, 小林秀昭, 門脇敏

第58回燃焼シンポジウム　2020/12/03
アンモニア/メタン/空気予混合気の乱流火炎伝播限界に与える拡散熱的不安定性の影響

橋本玄弥, Khalid Hadi, Yu Xia, 橋本望, 早川晃弘, 小林秀昭, 藤田修

第58回燃焼シンポジウム　2020/12/03
ガスタービン用アンモニア液噴燃焼の試み

倉田修, Ekenechukwu Chijioke Okafor, 山下裕史, 壹岐典彦, 辻村拓, 内田正宏, 伊藤慎太朗, 須田俊之, 早川晃弘, 小林秀昭

第58回燃焼シンポジウム　2020/12/02
高温高圧環境下におけるアンモニア／空気予混合火炎の層流燃焼速度とMarkstein長さ

加野島竜平, 工藤貴洋, 早川晃弘, Ekenechukwu Chijioke Okafor, 工藤琢, 小林秀昭

第58回燃焼シンポジウム　2020/12/02
Study of the Effect of Ammonia Addition on the Stabilization of a Non-premixed Methane Jet Flame in an Air Coflow

S. Colson, M. Kuhni, C. Galizzi, D. Escudié, H. Kobayashi

the Twentieth International Symposium on Advanced Fluid Information (AFI-2020)　2020/10/30
Heat-Loss Effects on the Dynamic Behavior of Hydrogen-Air Lean Premixed Flames Under the High-Pressure Conditions

S. Kadowaki, T. Furuyama, K. Kawata, T. Katsumi, H. Kobayashi

the Twentieth International Symposium on Advanced Fluid Information (AFI-2020),　2020/10/29
Study of Dynamic Behavior of NH3-H2 Premixed Flame at Elevated Pressures

S. Tabejamaat, S. Kadowaki, K.D.K.A. Somarathne, A. Hayakawa, H. Kobayashi

Twentieth International Conference on Flow Dynamics (ICFD2020),　2020/10/30
Effects of Airflow Boundary Layer Control on Flameholding Performance in Supersonic Flow

Y. Wakita, T. Yamaguchi, M. Hasegawa, Y. Yugami, T. Kudo, A. Hayakawa, H. Kobayashi

the Twentieth International Conference on Flow Dynamics (ICFD2020),　2020/10/28
Towards the Application of OH(2,0) PLIF to High-pressure Mixed Phase Combustion

Y. Higuchi, Y. Nunome, S. Tomioka, T. Tomita, T. Kudo, A. Hayakawa, H. Kobayashi

the Twentieth International Conference on Flow Dynamics (ICFD2020),　2020/10/28
Experimental Investigation of Laminar Burning Velocity of Ammonia/air Premixed Flames Under Elevated Temperature Conditions Invited

A. Hayakawa, H. Kobayashi

the Twentieth International Conference on Flow Dynamics (ICFD2020),　2020/10/30
Stability and Emissions Characteristics of Liquid Ammonia Spray Flames Co-fired with Methane in a Swirling Flow

H. Yamashita, E. C. Okafor, A. Hayakawa, T. Tsujimura, S. Ito, M. Uchida, T. Kudo, H. Kobayashi

the Twentieth International Conference on Flow Dynamics (ICFD2020),　2020/10/29
Liquid Ammonia Spray Combustion in Two-Stage Gas Turbine Combustors Invited

E.C. Okafor, O. Kurata, H. Yamashita, T. Inoue, T. Tsujimura, N. Iki, A. Hayakawa, M. Uchidai, S. Ito, H. Kobayashi

the Twentieth International Conference on Flow Dynamics (ICFD2020)　2020/10/29
同軸気流噴射弁を用いた噴霧燃焼に及ぼす雰囲気圧力の影響に関する研究

柴崎絢史, 松下剛士, 工藤琢, 内田正宏, 早川晃弘, 小林秀昭

日本機械学会熱工学コンファレンス2020,　2020/10/11
噴流せん断乱流が予混合火炎の構造に及ぼす影響

加藤元規, 佐々木央, 工藤琢, 早川晃弘, 小林秀昭

第57回燃焼シンポジウム　2019/11/20
Effect of NH3 addition into CH4/air swirl flames on NO emission characteristics

K.D.K.A. Somarathne,A. Hayakawa, H. Kobayashi

2019/11/20
水素-空気希薄予混合火炎の固有不安定性に及ぼす圧力の効果

門脇敏, 草野優太, 勝身俊之, 小林秀昭

第57回燃焼シンポジウム　2019/11/20
Progress in the Research of Fundamentals and Utilizations of Carbon Free Energy Carriers

H. Kobayashi

Proceedings of the Nineteenth International Symposium on Advanced Fluid Information (AFI-2019), (2019),　2019/11/07
The Effects of Heat Loss on the Dynamics of Hydrogen-Air Premixed Flames

S. Kadowaki, Y. Kusano, T. Katsumi, H. Kobayashi

Proceedings of the Nineteenth International Symposium on Advanced Fluid Information (AFI-2019),　2019/11/07
Effects of Swirler Dimensions on Atomization Characteristics of an Air-blast Atomizer

A. Shibazaki, K. Matsushita, T. Kudo, M. Uchida, A. Hayakawa, H. Kobayashi

Proceedings of the Sixteenth International Conference on Flow Dynamics (ICFD2019),　2019/11/07
Effects of Mixture Temperature on Laminar Burning Velocity and Markstein Length of Ammonia/Air Premixed Flames

T. Kudo, R. Kanoshima, A. Ichikawa, A. Hayakawa, T. Kudo, H. Kobayashi

Proceedings of the Sixteenth International Conference on Flow Dynamics (ICFD2019)　2019/11/07
Interactions between Turbulent Shear Flows and Jet Premixed Flames

M. Kato, H. Sasaki, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Sixteenth International Conference on Flow Dynamics (ICFD2019)　2019/11/07
Structure of Laminar and Turbulent Premixed Flames of Bio-Fuel Isomers

K. Nishikawa, T. Abe, A. Hayakawa, T. Kudo, H. Kobayashi

Proceedings of the Sixteenth International Conference on Flow Dynamics (ICFD2019)　2019/11/07
Measurement of the Effect of Recess on Co-axial Jet Diffusion Flames Using OH-PLIF at Elevated Pressures

Y. Higuchi, K. Takeuchi, Y. Nunome, S. Tomioka, T. Tomita, K. Sakaki, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Sixteenth International Conference on Flow Dynamics (ICFD2019),　2019/11/07
Effects Total Enthalpy Profiles on Stability of Ammonia/Air premixed Flames in a Swirling Flow

D. Sugawara, K. D. K. A. Somarathne, A. Hayakawa, H. Kobayashi

Proceedings of the Sixteenth International Conference on Flow Dynamics (ICFD2019),　2019/11/07
Experimental Study of Flame Propagation Limits of Ammonia/methane/air Mixture in Turbulent Fields

G. Hashimoto, K. Hadi, Y. Xia, A. Hamid, N. Hashimoto, A. Hayakawa, H. Kobayashi, O. Fujita

Proceedings of the Sixteenth International Conference on Flow Dynamics (ICFD2019),　2019/11/06
Experimental Study of Turbulent Burning Velocity of Ammonia/Oxygen/ Nitrogen Mixture in a Fan-Stirred Closed Vessel

Y. Xia, G. Hashimoto, K. Hadi, N. Hashimoto, A. Hayakawa, H. Kobayashi, O. Fujita

Proceedings of the Sixteenth International Conference on Flow Dynamics (ICFD2019),　2019/11/06
Product Gas Characteristics of Strain and Swirl Stabilized Ammonia/air Flames

A. Hayakawa, H. Kobayashi

Proceedings of the Sixteenth International Conference on Flow Dynamics (ICFD2019),　2019/11/06
Investigation of Effective Fuel Injection Systems for Scramjet Model Combustor With Double Pylon

Y. Yugami, T. Hizawa, T. Yamaguchi, M. Hasegawa, A. Hayakawa, T. Kudo, H. Kobayashi

Proceedings of the 12th Asia-Pacific Conference on Combustion　2019/07/02
Performance Improvement of Cavity Flame holder by Pylon Installation in Supersonic Flow

M. Hasegawa, T. Hizawa, T. Yamaguchi, Y. Yugami, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the 12th Asia-Pacific Conference on Combustion,　2019/07/02
Emission Characteristics of Turbulent Non premixed CH4/NH3/air Swirl Flames through a Rich-Lean Gas Turbine-like Combustor at High Pressure

K.D.K.A. Somarathne, E. C. Okafor, A. Hayakawa, H. Kobayashi

Proceedings of the 12th Asia-Pacific Conference on Combustion,　2019/07/03
Product Gas Characteristics of Strain Stabilized Ammonia/air Premixed Laminar Flames

A. Hayakawa, Y. Hirano, E. C. Okafor, T. Kudo, H. Kobayashi

Proceedings of the 12th Asia-Pacific Conference on Combustion,　2019/07/02
Ammonia Combustion for Gas-Turbine power Generations (Invited) Invited

WHTC2019 World Hydrogen Technologies Convention 2019　2019/06/05
二段燃焼によるアンモニア/空気予混合火炎からのNOおよび未燃アンモニア同時低減

早川晃弘, 塚本真章, K.D.K.A. Somarathne, 工藤琢, 小林秀昭

第56回日本伝熱シンポジウム　2019/05/29
カーボンフリーアンモニア燃焼の科学と技術 Invited

小林秀昭

第56回日本伝熱シンポジウム　2019/05/30
キャビティー保炎器の燃焼に与える保炎器先端形状の影響に関する研究

山口達也, 日沢知寛, 長谷川万里子, 湯上靖人, 工藤琢, 早川晃弘, 小林秀昭

日本航空宇宙学会北部支部2019年講演会ならびに第20回再使用型宇宙推進系シンポジウム　2019/03/19
アンモニア燃焼用低NOｘRich-leanガスタービン燃焼器の研究開発

倉田修, 壹岐典彦, 井上貴博, 辻村拓, 古谷博秀, 河野雅人, 新井啓介, E.C. Okafor, 早川晃弘, 小林秀昭

第56回燃焼シンポジウム　2018/11/16
水素-空気予混合火炎の不安定挙動に及ぼす熱損失とスケールの影響

門脇敏, 内山努, 勝身俊之, 小林秀昭

第56回燃焼シンポジウム　2018/11/15
Efficient Low NOx Combustion Strategies for Ammonia-methane Fuel a Micro Gas Turbine Combustor

E.C. Okafor, A. Hayakawa, R. Rattanasupapornsak, A. Hayakawa, T. Kudo, O. Kurata, N. Iki, H. Kobayashi

第56回燃焼シンポジウム　2018/11/14
Effect of Wall Quenching of a Gas Turbine- Like Combustor on Emission Characteristics of Ammonia/air Non-Premixed Swirling Flames

K.D.K.A. Somarathne, A. Hayakawa, H. Kobayashi

第56回燃焼シンポジウム　2018/11/14
A Study of Premixed Flames interacted with Turbulent Shear Flows

福井陽一, 佐々木央, 工藤琢, 早川晃弘, 小林秀昭

第56回燃焼シンポジウム　2018/11/14
Science and Technology for Utilizations of Carbon Free Energy Carriers International-presentation

H. Kobayashi

Proceedings of the Eighteenth International Symposium on Advanced Fluid Information (AFI-2018),　2018/11/08
The Effects of Heat Loss on the Dynamics of Hydrogen-Air Premixed Flames International-presentation

S. Kadowaki, T. Uchiyama, T. Katsumi, H. Kobayashi

Proceedings of the Eighteenth International Symposium on Advanced Fluid Information (AFI-2018),　2018/11/08
Effect of Ambient Pressure on Superheated Water Jet from a Fan Spray Injector International-presentation

R. Watanabe, D. Tsuchida, T. Kudo, H. Kobayashi

Proceedings of the Eighteenth International Symposium on Advanced Fluid Information (AFI-2018),　2018/11/08
Effect of Wall Heat Transfer on Emission Characteristics of Ammonia/air Swirling Flames in a Gas Turbine?like Combustor International-presentation

K. D, K. A. Somarathne, A. Hayakawa, H. Kobayashi

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/08
Emission Characteristics and the Structure of Ammonia-Air Flames in a Micro Gas Turbine Swirl Combustor International-presentation

E. C. Okafor, R. Rattanasupapornsak, K. D, K. A. Somarathne, A. Hayakawa, T. Kudo, O. Kurata, N. Iki, H. Kobayashi

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/08
Experimental Study of Turbulent Flame Propagation of Ammonia/Air Mixture in a Fan-Stirred Closed Vessel International-presentation

R. Ichimura, K. Hadi, N. Hashimoto, A. Hayakawa, H. Kobayashi, O. Fujita

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/08
Flame Front Structure of Ammonia/air Turbulent Premixed Flames in Swirling Flows under Various Pressures International-presentation

A. Hayakawa, M. Tsukamoto, K. D, K. A. Somarathne, T. Kudo, H. Kobayashi

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/08
Burnt Gas Characteristics of Swirl Stabilized Ammonia/air Turbulent Premixed Flames for Various Mixture Inlet Velocity International-presentation

M. Tsukamoto, A. Hayakawa, K. D, K. A. Somarathne, T. Kudo, H. Kobayashi

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/07
Effect of Shear Flow Turbulence on Premixed Flame International-presentation

H. Sasaki, Y. Fukui, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/07
Burning Velocity and Flame Structure of Ammonia/Hydrogen/Air Turbulent Premixed Flames at Elevated Pressures International-presentation

A. Ichikawa, T. Kudo, A. Hayakawa, T. Kudo, H. Kobayashi

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/07
Effect of Flash Boiling and Cavitation on Superheated Water Jet from a Fan Spray Injector under Ambient Pressure International-presentation

D. Tsuchida, R. Watanabe, H. Kobayashi, T. Kudo

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/07
Exhaust Gas Characteristics of Bio-fuel Combustion International-presentation

T. Abe, K. Takahashi, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/07
Development of Two-dimensional Supersonic Nozzle for a Scramjet Model Combustor International-presentation

T. Yamaguchi, T. Hizawa, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Fifteenth International Conference on Flow Dynamics (ICFD2018)　2018/11/07
旋回流中に保炎されたアンモニア/空気乱流予混合火炎の火炎構造

早川晃弘, 塚本真章, K.D.K.A. Somarathne, 工藤琢, 小林秀昭

日本機械学会熱工学コンファレンス2018　2018/10/20
Science and technology of ammonia combustion International-presentation

H. Kobayashi, A. Hayakawa, K.D.K.A. Somarathne, E.C. Okafor

37th International Symposium on Combustion　2018/08/03
Development of wide range operable, rich-lean low-NOx combustor for NH3 fuel gas-turbine power generations International-presentation

O. Kurata, N. Iki, T. Inoue, T. Matsunuma, T. Tsujimura, H. Furutani, M. Kawano, K. Arai, E.C. Okafor, A. Hayakawa, H. Kobayashi

37th International Symposium on Combustion　2018/08/03
Towards the development of an efficient low-NOx ammonia combustor for a micro gas turbine International-presentation

E.C. Okafor, K.D.K.A. Somarathne, A. Hayakawa, T. Kudo, O. Kurata, N. Iki, H. Kobayashi

37th International Symposium on Combustion　2018/08/03
Application of OH(2,0) band excited planar laser-induced fluorescence measurement to high pressure H2/O2 co-axial jet diffusion flames International-presentation

Y. Higuchi, K. Takeuchi, Y. Nunome, K. Sasaki, S. Tomioka, T. Kudo, A. Hayakawa, H. Kobayashi

37th International Symposium on Combustion　2018/08/02
Turbulent combustion characteristics of ammonia/hydrogen/air premixed flames at high pressure International-presentation

A. Ichikawa, A. Hayakawa, T. Kudo, H. Kobayashi

37th International Symposium on Combustion　2018/07/31
Investigation of methane-ammonia chemistry from premixed and diffusion flame structures using a counterflow configuration International-presentation

S. Colson, Y. Hirano, T. Kudo, A. Hayakawa, H. Kobayashi, D. Escudi?, C. Galizzi

37th International Symposium on Combustion　2018/07/31
Quantitative measurement of temperature in oxygen enriched CH4/O2/N2 premixed flames using Laser Induced Thermal Grating Spectroscopy (LITGS) up to 1.0MPa International-presentation

A. Hayakawa, T. Yamagami, K. Takeuchi, Y. Higuchi, T. Kudo, S. Lowe, Y. Gao, S. Hochgreb, H. Kobayashi

37th International Symposium on Combustion　2018/07/31
The Effect of Wall Heat Loss in a Gas Turbine-like Combustor on the Emission Characteristics of Ammonia (NH3)/air Swirling Flames International-presentation

K.D.K.A. Somarathne, E.C. Okafor, A. Hayakawa, H. Kobayashi

37th International Symposium on Combustion　2018/07/30
CH4/NH3/air乱流予混合火炎の火炎構造に与える圧力およびアンモニア濃度の影響

市川昌紀, 内藤佑次, 早川晃弘, 工藤琢, 小林秀昭

第55回日本伝熱シンポジウム,　2018/05/30
Achievement of Low NOx Emission on From Ammonia Micro Gas Turbine Combustor

E.C. Okafor, A. Hayakawa, T. Kudo, O. Kurata, N. Iki, H. Kobayshi

第55回日本伝熱シンポジウム,　2018/05/30
Flame structure characteristics of swirl stabilized ammonia/air premixed flames International-presentation

A. Hayakawa, M. Tsukamoto, K.D.K.A. Somarathne, T. Kudo, H. Kobayashi

2nd European Power to Ammonia Conference　2018/05/18
水素/空気燃焼ガストーチイグナイタの噴射ガス温度推定法の検証

山口達也, 日沢知寛, 市川太郎, 工藤琢, 早川晃弘, 小林秀昭

日本航空宇宙学会北部支部2018年講演会ならびに第19回再使用型宇宙推進系シンポジウム　2018/03/06
Laser Induced Thermal Grating Spectroscopyによる酸素富化CH4/O2/N2予混合火炎の高圧下における定量温度計測

早川晃弘, 山上朋恭, 竹内清剛, 樋口靖浩, 工藤琢, Steven Lowe, 髙怡, Simone Hochgreb, 小林秀昭

日本航空宇宙学会北部支部2018年講演会ならびに第19回再使用型宇宙推進系シンポジウム　2018/03
Stabilization and Emission Characteristics of Ammonia Flames in a Micro Gas Turbine Combustor International-presentation

E.C. Okafor, K. Sakai, A. Hayakawa, T. Kudo, O. Kurata, N. Iki, H. Kobayashi

Proceedings of the 11th Asia-Pacific Conference on Combustion　2017/12/14
Modeling of Ammonia/air Non-premixed Turbulent Swirling Flames in a Gas Turbine like Combustor International-presentation

K.D.K.A. Somrathne, A. Hayakawa, N. Iki, O. Kurata, H. Kobayashi

Proceedings of the 11th Asia-Pacific Conference on Combustion　2017/12/12
Development of a Gas Turbine Power Generation System Firing Ammonia Gas International-presentation

N. Iki, O. Kurata, T. Matsunuma, T. Inoue, T. Tsujimura, H. Furutani, H. Kobayashi, A. Hayakawa

XIII Research & Development in Power Engineering Conference 2017　2017/11/28
底面に単孔噴射機を有するキャビティー保炎器の保炎に与える境界層厚さの影響

山口達也, 市川太郎, 日沢知寛, 工藤琢, 早川晃弘, 小林秀昭

第55回燃焼シンポジウム講演論文集　2017/11/15
高圧環境におけるCH4/air乱流燃焼特性に及ぼすアンモニア添加の影響

市川昌紀, 内藤佑次, 早川晃弘, 工藤琢, 小林秀昭

第55回燃焼シンポジウム講演論文集　2017/11/15
OH-PLIFを用いた高圧ロケット燃焼条件におけるH2/O2同軸噴流拡散火炎の2次元瞬時OH分布計測

竹内清剛, 布目佳央, 榊和樹, 富岡定毅, 工藤琢, 早川晃弘, 小林秀昭

第55回燃焼シンポジウム講演論文集　2017/11/15
水素-空気予混合火炎の不安定挙動に及ぼすスケール効果-フラクタル解析による不安定性の評価-

大木涼資, トエトエアウン, 勝身俊之, 門脇敏, 小林秀昭

第55回燃焼シンポジウム講演論文集　2017/11/14
アンモニアガスタービンとテストリグの燃焼器排ガス特性の違いについて

倉田修, 壹岐典彦, 松沼孝幸, 井上貴博, 辻村拓, 古谷博秀, 早川晃弘, 小林秀昭

第55回燃焼シンポジウム講演論文集　2017/11/14
予混合火炎の固有不安定性における活性化エネルギー及び未燃ガス温度の影響

高橋友康, トエトエアウン, 勝身俊之, 門脇敏, 小林秀昭

第55回燃焼シンポジウム講演論文集　2017/11/13
Investigations of Reacting Flow Phenomena under Extreme Environmental Conditions International-presentation

H. Kobayashi

Proceedings of the Seventeenth International Symposium on Advanced Fluid Information (AFI-2017)　2017/11/02
Spray Characteristics of High-temperature Water Jet Injected from a Fan Spray Nozzle International-presentation

R. Watanabe, D. Tsuchida, T. Tanaka, H. Kobayashi

Proceedings of the Seventeenth International Symposium on Advanced Fluid Information (AFI-2017)　2017/11/02
Numerical Study on the Intrinsic Instability of Premixed Flames Based on the One-Step and Detail Chemical Reaction Models International-presentation

S. Kadowaki, R. Ohki, T. Takahashi, T. T. Aung, T. Katsumi, H. Kobayashi

Proceedings of the Seventeenth International Symposium on Advanced Fluid Information (AFI-2017)　2017/11/02
Performance Prediction for Gas Turbine Co-firing Ammonia and Natural Gas International-presentation

S. Ito, S. Kato, M. Uchida, S. Onishi, T. Fujimori, H. Kobayashi

Proceedings of the Fourteen International Conference on Flow Dynamics (ICFD2017)　2017/11/02
Turbulent Burning Velocity of CH4/NH3/Air Premixed Flames at High Pressure International-presentation

Y. Naito, A. Ichikawa, A. Hayakawa, T. Kudo, H. Kobayashi

Proceedings of the Fourteen International Conference on Flow Dynamics (ICFD2017)　2017/11/02
Effects of Ambient Pressure on Spray Combustion with an Air-blast Atomizer International-presentation

K. Matsushita, K. Kato, T. Kudo, S. Kato, M. Uchida, A. Hayakawa, H. Kobayashi

Proceedings of the Fourteen International Conference on Flow Dynamics (ICFD2017)　2017/11/02
Effects of Double Pylon Upstream of a Cavity on Flame Structure in Supersonic Flow International-presentation

T. Hizawa, K. Murata, T. Yamaguchi, T. Ichikawa, T. Kudo, A. Hayakawa, H. Kobayashi

Proceedings of the Fourteen International Conference on Flow Dynamics (ICFD2017)　2017/11/02
Methods for Low NOx Combustion in Ammonia/Natural Gas Dual Fuel Gas Turbine Combustor International-presentation

S. Onishi, S. Ito, M. Uchida, S. Kato, T. Saito, T. Fujimori, H. Kobayashi

2017 NH3 Fuel Conference　2017/11/01
Combustion Emission from NH3 Fuel Gas Turbine Power Generation Demonstrated International-presentation

O. Kurata, N. Iki, T. Inoue, T. Matsunuma, T. Tsujimura, H. Furutani, H. Kobayashi, A. Hayakawa

2017 NH3 Fuel Conference　2017/11/01
The Unstable Behavior of Non-Adiabatic Cellular Premixed Flames in Large Space: Fractal Analysis of Flame Fronts International-presentation

S. Kadowaki, Y. Morita, T.T. Aung, T. Katsumi, H. Kobayashi

Extended Abstract of the Ninth JSME-KSME Thermal and Fluids Engineering Conference　2017/10/29
Effects of Pressure on Combustion Characteristics of Ammonia/air Premixed Turbulent Flames in Swirling Flows International-presentation

A. Hayakawa, Y. Arakawa, K.D.K.A. Somarathne, T. Kudo, H. Kobayashi

Extended Abstract of the Ninth JSME-KSME Thermal and Fluids Engineering Conference　2017/10/29
アンモニア用ガスタービン燃焼器の研究開発

倉田修, 壹岐典彦, 井上貴博, 松沼孝幸, 辻村拓, 古谷博秀, 小林秀昭, 早川晃弘

第45回日本ガスタービン学会定期公演会　2017/10/18
Flame Stabilization Mechanisms of Ammonia/air Premixed Flames in High Speed Swirling Flows International-presentation

A. Hayakawa, Y. Arakawa, K.D.K.A. Somarathne, T. Kudo, H. Kobayashi

254th American Chemical Society National Meeting & Exposition　2017/08/20
Dynamics of Ammonia Combustion International-presentation

H. Kobayashi

26th International Colloquium on the Dynamics of Explosions and Reactive Systems　2017/08/02
Combustion and Emission Characteristics of Premixed and Non-Premixed Ammonia/Air Turbulent Swirl Flames at High Pressure and Temperature International-presentation

K.D.K.A. Somarathne, A. Hayakawa, H. Kobayashi

26th International Colloquium on the Dynamics of Explosions and Reactive Systems　2017/08/01
Gas Turbine Power Generation System Firing Ammonia and Natural Gas International-presentation

N. Iki, O. Kurata, M. Matsunuma, T. Inoue, T. Tsujimura, H. Furutani, H. Kobayashi, A. Hayakawa

Programme & Abstract Book of the 7th World Hydrogen Technology Convention　2017/07/09
SIP Energy Carriers - Ammonia Direct Combustion International-presentation

H. Kobayashi, A. Hayakawa

Programme & Abstract Book of the 7th World Hydrogen Technology Convention　2017/07/09
Flame Stability and Emission Characteristics of Ammonia/air Turbulent Premixed Flames in High Speed Swirling Flows International-presentation

A. Hayakawa, Y. Arakawa, K.D.K.A. Somarathne, T. Kudo, H. Kobayashi

Programme & Abstract Book of the 7th World Hydrogen Technology Convention　2017/07/09
Operation and Flame Observation of Micro Gas Turbine Firing Ammonia International-presentation

N. Iki, O. Kurata, T. Matsunuma, T. Inoue, T. Tsujimura, H. Furutani, H. Kobayashi, A. Hayakawa

Proceedings of the ASME Turbo Expo2017: Turbomachinery Technical Conference and Exposition　2017/06/30
Success of Ammonia-Fired, Regenerator-Heated, Diffusion Combustion Gas Turbine Power Generation and Prospect of Low Nox Combustion With High Combustion Efficiency International-presentation

O. Kurata, N. Iki, T. Matsunuma, T. Inoue, T. Tsujimura, H. Furutani, A. Hayakawa, H. Kobayashi

Proceedings of the ASME2017 Power and Energy Conference　2017/06/27
Development of an Ammonia-burning Gas Turbine Power Generation International-presentation

N. Iki, O. Kurata, T. Matsunuma, T. Inoue, T. Tsujimura, H. Furutani, H. Kobayashi, A. Hayakawa

39th IEA Combustion　2017/06/16
アンモニア燃焼ガスタービン発電用の低NOx燃焼器開発のための試験設備

倉田修, 壹岐典彦, 松沼孝幸, 井上貴博, 辻村拓, 古谷博秀, 小林秀昭, 早川晃弘

第22回動力・エネルギー技術シンポジウム　2017/06/15
Optimization and Validation of Detailed Reaction Mechanisms for CH4-NH3-Air Premixed Flames

Okafor Ekenechukwu, 内藤佑二, Colson Sophie, 市川昌紀, 工藤琢, 早川晃弘, 小林秀昭

第54回日本伝熱シンポジウム　2017/05/24
旋回流燃焼器におけるアンモニア/空気火炎の空気二次噴射によりNOｘおよび未燃NH3低減

畑山宗多郎, K.D. Kunkuma, A. Somarathne, 早川晃弘, 小林秀昭

日本航空宇宙学会北部支部創立30周年記念2017年講演会ならびに第18回再使用型宇宙推進系シンポジウム　2017/03/17
超音速流におけるパイロン付きキャビティー保炎器の火炎構造に関する研究

日沢知寛, 村田光, 山口達也, 市川太郎, 工藤琢, 早川晃弘, 小林秀昭

日本航空宇宙学会北部支部創立30周年記念2017年講演会ならびに第18回再使用型宇宙推進系シンポジウム　2017/03/17
ファインスプレイノズルによる高温水噴射における噴霧特性に関する研究

第25回微粒化シンポジウム　2016/12/19
アンモニア・天然ガス混焼ガスタービン燃焼器技術の開発

第54回燃焼シンポジウム　2016/11/25
アンモニア燃焼ガスタービン発電装置の燃焼状態の観察

第54回燃焼シンポジウム　2016/11/25
高圧高温火炎に対する光学計測校正バーナーの開発

第54回燃焼シンポジウム　2016/11/25
Extinction Analysis and Experiments of Methane/ammonia/air Counterflow Twin Flames

第54回燃焼シンポジウム　2016/11/24
The Effects of Pressure on Emission Reduction Characteristics of Turbulent Premixed Ammonia/air Flames Stabilized by a Swirl Burner

第54回燃焼シンポジウム　2016/11/24
予混合火炎の不安定挙動に及ぼす未燃ガス温度と熱損失の影響

第54回燃焼シンポジウム　2016/11/24
Laminar Burning Velocity and Markstein Lengths of CH4-NH3-Air Premixed Flames up to Elevated Pressures

第54回燃焼シンポジウム　2016/11/23
Quantitative Temperature Measurement of High Pressure CH4/O2/N2Laminar Flames Using Laser Induced Thermal Grating Spectroscopy (LITGS)

第54回燃焼シンポジウム　2016/11/23
Gas Turbine Power Generation System firing Ammonia-Methane Mixture International-presentation

Proceedings of the Asian Congress on Gas Turbines (ACGT2016)　2016/11/14
ガスタービンにおけるアンモニア燃焼利用

第44回日本ガスタービン学会定期講演会　2016/10/26
アンモニアマイクロガスタービン燃焼器における保炎限界と燃焼排出ガス特性

日本機械学会熱工学コンファレンス2016　2016/10/23
Effect of Cavity with a Pylon on the Flame in Supersonic Flow International-presentation

Proceedings of the Thirteenth International Conference on Flow Dynamics (ICFD2016),　2016/10/11
Effects of NH3 Addition on the Laminar Burning Velocity and Markstein Length of CH4-Air Premixed Flames International-presentation

Proceedings of the Thirteenth International Conference on Flow Dynamics (ICFD2016)　2016/10/11
Flame Stabilization Limits and Emission Characteristics of an Ammonia Micro Gas Turbine Combustor International-presentation

Proceedings of the Thirteenth International Conference on Flow Dynamics (ICFD2016),　2016/10/11
Liquid Sheet Wave Characteristics of Water Spray from a Fan Spray Nozzle under High Ambient Pressure International-presentation

Proceedings of the Sixteenth International Symposium on Advanced Fluid Information (AFI-2016)　2016/10/11
Quantitative Temperature Measurement of High Pressure Flame by Using laser Induced Thermal Grating Spectroscopy (LITGS) International-presentation

Proceedings of the Sixteenth International Symposium on Advanced Fluid Information (AFI-2016)　2016/10/11
The Effects of Unburned-Gas temperature and Heat Loss on the Dynamics of Premixed Flames-Fracral Analysis of Flame Fronts- International-presentation

Proceedings of the Sixteenth International Symposium on Advanced Fluid Information (AFI-2016),　2016/10/11
Combustion Characteristics of Ammonia/air Flames for a Model Swirl Burner and an Actual Gas Turbine Combustor International-presentation

13th Annual 2016 NH3 Fuel Conference　2016/09/19
Development of Ammonia / Natural Gas Dual Fuel Gas Turbine Combustor International-presentation

13th Annual 2016NH3 Fuel Conference　2016/09/19
Power generation and Flame Visualization of Micro Gas Turbine Firing Ammonia or Ammonia-Methane Mixture International-presentation

13th Annual 2016 NH3 Fuel Conference,　2016/09/19
超音速流におけるパイロン付きキャビティー保炎器に関する研究

第60回宇宙科学技術連合講演会　2016/09/07
Numerical Investigation on Emission Reduction Characteristics of Turbulent Swirl Flames for Ammonia/air Mixture International-presentation

36th International Symposium on Combustion　2016/08/05
Effects of NH3 Addition on the Laminar Burning Velocity and Markstein Length of CH4-Air Premixed Flames International-presentation

36th International Symposium on Combustion,　2016/08/04
Flame Structure and Burning Velocity of Ammonia/Hydrogen/Air Turbulent Premixed Flames International-presentation

36th International Symposium on Combustion　2016/08/04
Extinction Characteristics of Counterflow Premixed Flames for Ammonia/air, Methane/air and Their Mixtures International-presentation

36th International Symposium on Combustion　2016/08/02
Blow-Off Limit of Ethanol Spray Flame in Swirl Flow Using a Pre-Filming Air-Blast Atomizer at Elevated Pressure International-presentation

36th International Symposium on Combustion　2016/08/01
Performances and Emission Characteristics of NH3-air and NH3-CH4-air Combustion Gas Turbine Power Generations International-presentation

36th International Symposium on Combustion　2016/08/01
Supersonic Combustion Using Pre-Combustion Gas Injection from a Bottom Single Hole into a Cavity Flameholder International-presentation

36th International Symposium on Combustion　2016/08/01
Micro Gas Turbine Firing Ammonia International-presentation

roceedings of ASME Turbo Expo 2016　2016/06/17
Ammonia-fired gas turbine power generation system International-presentation

Proceedings of the 21st World Hydrogen Energy Conference 2016　2016/06/15
Stabilization and Emission Characteristics of Ammonia/air Premixed Flames in Swirling Flows International-presentation

Proceedings of the 21st World Hydrogen Energy Conference 2016　2016/06/15
Numerical Investigation on the Emission Reduction Characteristics of the Turbulent Premixed Ammonia/air Flames Stabilized by a Swirl Burner

第53回日本伝熱シンポジウム　2016/05/25
A Study of Cavity Combustion for Pre-burnt Injection Gas from a Single Hole in Supersonic Air Stream International-presentation

Proceedings of the First Pacific Rim Thermal Engineering Conference　2016/03/17
Extinction Characteristics of Ammonia/Air Counterflow premixed Flames at Various Pressures International-presentation

Proceedings of the First Pacific Rim Thermal Engineering Conference,　2016/03/16
キャビティー保炎器内部への予燃焼ガス単孔噴射を用いた超音速燃焼に関する研究

日本航空宇宙学会北部支部2016年講演会ならびに第17回再使用型宇宙推進系シンポジウム　2016/03/09
エネルギーキャリアーアンモニア直接燃焼の科学と技術

日本エネルギー学会触媒学会合同シンポジウム　2016/01/29
カーボンフリーアンモニア燃焼 –SIP エネルギーキャリアプロジェクトにおける取り組み

第53回燃焼シンポジウム　2015/11/18
スワールバーナにおけるアンモニア・都市ガス混焼の基礎特性

第53回燃焼シンポジウム　2015/11
高低温度環境におけるセル状予混合火炎のダイナミクス-流体力学的効果と拡散・熱的効果による固有不安定性

第53回燃焼シンポジウム　2015/11
Intrinsic Instabilities of Premixed Flames with High Lewis-Number Reactants and Intermediate Products International-presentation

Fifteenth International Symposium on Advanced Fluid Information　2015/10
Liquid Film Breakup and Atomization of Water Spray Jet under High Ambient Pressure International-presentation

Fifteenth International Symposium on Advanced Fluid Information　2015/10
Combustion Characteristics of Ammonia/natural Gas Dual Fuel Burner for Gas Turbine Combustor International-presentation

2015 NH3 Fuel Conference, Argonne National Laboratory, United States　2015/09
High-Pressure Turbulent Premixed Combustion of Biofuels International-presentation

10th Asia-Pacific Conference on Combustion, Beijing China　2015/07/22
High-Pressure Combustion Test Facilities in IFS and Recent Progress in Experimental Research at High Pressure International-presentation

High-Pressure and High-Reynolds Combustion Workshop, King Abdullah University of Science and Technology, Saudi Arabia　2015/03/24
Determination of the Entrainment and Dilution Characteristics in Confined Flames on NOx Emission

第52回燃焼シンポジウム　2014/12
Effects of Liquid Properties on Atomization Behavior and Characteristics of an Airblast Atomizer in a High Pressure Environment

第52回燃焼シンポジウム　2014/12
高圧Ｈ2/Ｏ2噴流拡散火炎に対するＯＨ-ＰＬＩＦ計測の適用に関する研究

第52回燃焼シンポジウム　2014/12
高圧環境における石炭改質ガス乱流予混合火炎の排出ガス特性に関する研究

第52回燃焼シンポジウム　2014/12
高圧環境下におけるアンモニア空気予混合火炎の層流燃焼特性

第52回燃焼シンポジウム　2014/12
超音速燃焼におけるオゾン添加による保炎性能向上に関する研究

第52回燃焼シンポジウム　2014/12
予混合火炎の不安定性に及ぼす中間生成物の影響：二段反応に基づく流れ場の数値シミュレーション

第52回燃焼シンポジウム　2014/12
高圧下におけるアンモニア/水素/空気予混合火炎の燃焼特性

第25回内燃機関シンポジウム　2014/11
水素添加アンモニア/空気予混合火炎の燃焼特性に関する研究

日本機械学会熱工学コンファレンス2014　2014/11
Atomizing Characteristics of Water and Liquid Nitrogen Jets under High Pressure Environment International-presentation

Fourteenth International Symposium on Advanced Fluid Information (AFI/TFI-2014)　2014/10
Combustion Enhancement by Ozone Addition in Supersonic Flow International-presentation

Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　2014/10
Effects of Intermediate Species on Flame Instability in Turbulent Premixed Flames of Propanol Isomers at High Pressure International-presentation

Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　2014/10
Effects of Liquid Properties on Airblast Atomization in a High Pressure Environment International-presentation

Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　2014/10
Experimental and Numerical Investigations of Laminar Burning Velocity of Ammonia/air Premixed Flames International-presentation

Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　2014/10
Interaction between Incident Shock Wave and Pre-combustion Gas Injection from a Ramp Injector in Supersonic Flow International-presentation

Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　2014/10
OH-PLIF Measurements of GH2/GO2 Diffusion Flames Using Higher Electron Excitation Bands International-presentation

Eleventh International Conference on Flow Dynamics (11th ICFD 2014)　2014/10
The Effects of Intermediate Product on the Intrinsic Instability of Premixed Flames with High Lewis Number Reactant International-presentation

Fourteenth International Symposium on Advanced Fluid Information (AFI/TFI-2014)　2014/10
Effects of Ambient Pressure and Liquid Properties on Atomization Characteristics of an Airblast Atomizer International-presentation

26th European Conference on Liquid Atomization & Spray Systems　2014/09
Fundamental Characteristics of Ammonia/Air Premixed Laminar Flames International-presentation

2014 NH3 Fuel Conference　2014/09
球状に伝播するアンモニア空気予混合火炎の層流燃焼特性

日本機械学会2014年度年次大会　2014/09
On the Role of Intermediate Species in Turbulent Premixed Combustion of Propane and Prpanol Isomers at High Pressure International-presentation

35th International Symposium on Combustion　2014/08/08
Effects of Ambient Pressure on Atomization Behavior of Airblast Atomizer International-presentation

35th International Symposium on Combustion　2014/08/06
NO Formation/Reduction Mechanisms of Ammonia/Air Premixed Laminar Flames at Various Equivalence Ratios and Ambient Pressures International-presentation

35th International Symposium on Combustion　2014/08/06
Interaction Between Pre-Combustion Gas Injection From a Ramp Injector and Incident Shockwave in Supersonic Flow International-presentation

35th International Symposium on Combustion　2014/08/05
Laminar Burning Velocity and Markstein Number of Spherically Propagating Ammonia/Air Premixed Flames International-presentation

35th International Symposium on Combustion　2014/08/05
The Effects of Unburned-gas Temperature on Intrinsic Instabilities of 3-D Premixed Flames International-presentation

35th International Symposium on Combustion　2014/08/04
2ラインOH-PLIFによるエッジフレームの温度計測

日本航空宇宙学会北部支部2014年　2014/03
超音速流において衝撃波干渉するキャビティー保炎器下流の火炎構造に関する研究

日本航空宇宙学会北部支部2014年　2014/03
Characteristics of Ammonia/air Laminar Premixed Flames and NO Formation/Reduction Mechanism International-presentation

Taiwan-Japan Fuel Cell-Energy Carrier Workshop　2013/12
アンモニア予混合火炎の層流燃焼速度およびNOｘ生成持性

第51回燃焼シンポジウム　2013/12
気流噴射弁の噴霧形成過程に及ぼす雰囲気圧力の影響

第51回燃焼シンポジウム　2013/12
高圧下におけるプロパノール異性体乱流予混合火炎の火炎構造及び不安定性に関する研究

第51回燃焼シンポジウム　2013/12
高圧環境におけるCO/H2/CO2/O2乱流予混合火炎構造に及ぼす燃料組成の影響

第51回燃焼シンポジウム　2013/12
高圧環境における気流噴射弁の噴霧粒径および噴霧形成過程に関する研究

第16回微粒化アジア会議第22回微粒化シンポジウム　2013/12
三次元予混合火炎の流体力学的不安定性：セル状火炎の特性に及ぼす未燃ガス温度の影響

第51回燃焼シンポジウム　2013/12
超音速流におけるランプインジェクター下流燃焼領域の衝撃波干渉に関する研究

第51回燃焼シンポジウム　2013/12
Effects of Ambient Pressure on Liquid Sheet Breakup of Airblast Atomizer International-presentation

Tenth International Conference on Flow Dynamics　2013/11
Interaction between Incident Shock Wave and Combustion Downstream of Ramp Injector in Supersonic Flow International-presentation

Tenth International Conference on Flow Dynamics　2013/11
The Effects of the Unburned-Gas Temperature on the Hydrodynamic Instability of Three-Dimensional Premixed Flames International-presentation

The Thirteenth International Symposium on Advanced Fluid Information　2013/11
高圧環境におけるプロパノール異性体乱流予混合火炎の構造に関する研究

日本機械学会熱工学コンファレンス2013　2013/10
Effects of CO/H2 ratio on Turbulent Combustion Characteristics for CO/H2/CO2/O2 Mixtures at High Pressure International-presentation

9th Asia-Pacific Conference on Combustion　2013/05
Effects of Incident Shock Wave on Combustion Downstream of Ramp Injector in Supersonic Flow International-presentation

9th Asia-Pacific Conference on Combustion　2013/05
Measurement of the instantaneous detailed flame front structure of syngas turbulent premixed flames at high pressure International-presentation

9th Asia-Pacific Conference on Combustion　2013/05
Numerical Study on the Hydrodynamic Instability of High-Temperature Premixed Flames: Formation of Three-Dimensional Cellular Fronts International-presentation

9th Asia-Pacific Conference on Combustion　2013/05
高圧環境における気流噴射弁の噴霧形成過程に関する研究

第50回日本伝熱シンポジウム　2013/05
高温予混合火炎の数値解析：固有不安定性による三次元セル状火炎の形成

第50回燃焼シンポジウム　2012/12
超音速流におけるキャビティー下流の燃焼領域に及ぼす入射衝撃波の影響

第50回燃焼シンポジウム　2012/12
OH-PLIF法を用いたぺブル充填層内伝播火炎の局所乱流火炎構造に関する研究

第50回燃焼シンポジウム　2012/12
高圧環境における気流噴射弁の噴霧特性に関する研究

第50回燃焼シンポジウム　2012/12
高圧環境における同軸酸素噴流拡散火炎の安定性に及ぼす乱流強化の影響

第50回燃焼シンポジウム　2012/12
高圧環境におけるアルコール系バイオ燃料の乱流燃焼メカニズムに関する研究

第50回燃焼シンポジウム　2012/12
高圧環境における同軸酸素噴流拡散火炎の安定化機構

日本機械学会熱工学コンファレンス2012　2012/11
Combustion Characteristics of Propanol／Air Turbulent Premixed Flames at High Pressur International-presentation

Ninth International Conference on Flow Dynamics (9th ICFD 2012)　2012/09
Formation of Cellular Fronts in High-Temperature Premixed Flames International-presentation

The Twelfth International Symposiumu on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI/TFI-2012　2012/09
Effects of Incident Shock Wave and Cavity on Flameholding in Supersonic Flow International-presentation

Ninth International Conference on Flow Dynamics (9th ICFD 2012)　2012/09
数値シミュレーションによるストーカ炉内燃焼挙動解析（第二報）

第22回環境工学総合シンポジウム2012　2012/07
Turbulent premixed flame characteristics of a CO/H2/O2 mixture highly diluted with CO2 in a high-pressure environment International-presentation

34th International Symposium on Combustion,　2012/07
Turbulent Combustion Characteristics of Propanol Isomers in a High-Pressure Environment International-presentation

34th International Symposium on Combustion　2012/07
アルコール系バイオ燃料の高圧乱流燃焼特性に関する研究

第49回日本伝熱シンポジウム2012　2012/05
Atomization Characteristics of an Airblast Atomizer Operated in aHigh Pressure Environment International-presentation

The Eighth KSME-JSME Thermal and Fluids Engineering Conference　2012/03/20
Flame Front Structure Characteristics of Turbulent Premixed Flames Diluted with CO2 and H2O at High Pressure and High Temperature International-presentation

The Eighth KSME-JSME Thermal and Fluids Engineering Conference　2012/03/19
Flame Structure and Propagation Mechanism through Meso－Scale Flow Channel Network in a Packed Bed at High Pressure International-presentation

The Eighth KSME-JSME Thermal and Fluids Engineering Conference　2012/03/19
高温予混合火炎の数値解析：固有不安定性に及ぼす未燃ガス温度とルイス数の影響

日本機械学会北陸信越支部第49期総会・講演会　2012/03/10
高圧下における石炭改質模擬ガスに対する純酸素予混合乱流燃焼特性

第49回燃焼シンポジウム　2011/12
高圧下における乱流予混合火炎の火炎面構造解析に関する研究

第49回燃焼シンポジウム　2011/12
高温高圧下におけるエタノール/空気予混合火炎の燃焼反応機構の解析

第49回燃焼シンポジウム　2011/12
高温予混合火炎の数値解析：未燃ガス密度一定条件下における火炎面の不安定性

第49回燃焼シンポジウム　2011/12
数値シミュレーションによるストーカー炉内燃焼挙動解析

第49回燃焼シンポジウム　2011/12
A Study on Turbulent Premixed Combustion for CO/H2/CO2/O2 Mixture at High Pressure International-presentation

The Eighth International Conference on Flow Dynamics (8th ICFD 2011)　2011/11
Effects of Elevated Ambient Pressure on Atomization Characteristics of Airblast Atomizer International-presentation

The Eighth International Conference on Flow Dynamics (8th ICFD 2011)　2011/11
Instability of High-Temperature Premixed Flames International-presentation

The Eleventh International Symposiumu on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI/TFI-2011)　2011/11
Turbulent Combustion of Model Coal-gasification Syngas at High Pressure International-presentation

The Eleventh International Symposiumu on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI/TFI-2011)　2011/11
高圧下における石炭改質模擬ガスの純酸素乱流燃焼特性に関する研究

日本機械学会熱工学コンファレンス 2011　2011/10
高温高圧下におけるエタノール予混合火炎の燃焼メカニズムに関する研究

日本機械学会熱工学コンファレンス 2011　2011/10
高温予混合火炎の固有不安定性に関する数値解析：未燃ガス密度一定条件下における温度の影響

第48回日本伝熱シンポジウム2011　2011/06
Effects of Pressure on Laminar Burning Velocity for Fuel-rich CH4/O2 Flames With Steam Dilution International-presentation

8th Asia-Pacific Conference on Combustion　2010/12
Experimental Study on The Stability of Oxygen-Jet Diffusion Flames at Elevated Pressure International-presentation

8th Asia-Pacific Conference on Combustion　2010/12
Turbulent Flame Propagation for Preheated CH4/air Mixture in a Packed Pebble Bed at High Pressure International-presentation

8th Asia-Pacific Conference on Combustion　2010/12
ペブル充填層内を伝播する乱流予混合火炎の基礎特性と雰囲気圧力の影響

第48回燃焼シンポジウム　2010/12
よどみ点流れ場を用いたポリマーの熱分解反応パラメーター計測法に関する研究

第48回燃焼シンポジウム　2010/12
高圧下における酸素噴流拡散火炎の安定性に関する研究

第48回燃焼シンポジウム　2010/12
高圧下における石炭改質模擬ガスを燃料とするCO/H2・CO2/air乱流予混合火炎に関する研究

第48回燃焼シンポジウム　2010/12
高温予混合火炎数値シミュレーション：固有不安定性に起因するセル状火炎の形成

第48回燃焼シンポジウム　2010/12
超音速流における衝撃波と干渉する噴流火炎の構造に関する研究

第48回燃焼シンポジウム　2010/12
Effect of Pressure on Premixed Flame Propagation Mode in a Packed Pebble Bed Reactor International-presentation

The Seventh International Conference on Flow Dynamics (7th ICFD 2010)　2010/11
The Tenth International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration International-presentation

International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI/TFI-2010)　2010/11
Turbulent Burning Velocity and Flame Structure of CO/H2/CO2Premixed Flames in a High Pressure Environment International-presentation

The Seventh International Conference on Flow Dynamics (7th ICFD 2010)　2010/11
A Stady on The Stability of Oxygen Jet Diffuson Flames at Elevated Pressure International-presentation

The33rd International Symposium on Combustion　2010/10
高圧、高当量比条件下におけるCH4/O2/H2O予混合火炎の燃焼反応メカニズムに関する研究

日本機械学会熱工学コンファレンス 2010　2010/10
高圧環境におけるCO/H２/CO2air乱流予混合火炎の構造に関する研究

日本機械学会熱工学コンファレンス 2010　2010/10
高温予混合火炎の固有不安定性に及ぼすルイス数の効果

日本機械学会熱工学コンファレンス 2010　2010/10
Effect of the Incident Shockwave Interacing With Transversal Jet Flow on the Mixing and Combustion International-presentation

The33rd International Symposium on Combustion　2010/08
Flame Structure and Radiation Characteristics of CO/H2/CO2/air Turbulent Premixed Flames at High Pressure International-presentation

The33rd International Symposium on Combustion　2010/08
The Effects of Radiation on the Dynamic Behavior of Cellular Premixed Flames Generated by Intrinsic Instability International-presentation

The33rd International Symposium on Combustion　2010/08
Turbulent Combustion Characteristics of Premixed Gases in a Packed Pebble Bed at High Pressure International-presentation

The33rd International Symposium on Combustion　2010/08
高温予混合火炎の数値解析：エンタルピー一定条件下における火炎面の不安定性

第47回日本伝熱シンポジウム　2010/06
流体科学研究所エネルギークラスターの活動と燃焼研究

電力エネルギー未来技術（東北電力）寄附研究部門第Ⅱ期研究教育成果報告会　2010/03/18
ぺブル充填層における高圧乱流燃焼メカニズムに関する研究

第47回燃焼シンポジウム　2009/12
高圧下における高次炭化水素詳細反応メカニズムを用いたCH4/O2/H2O層流混合火炎の数値解析

第47回燃焼シンポジウム　2009/12
高圧下における単一液滴火炎の流速変動に対する応答に関する研究

第47回燃焼シンポジウム　2009/12
高温高圧下におけるCO2およびH2O希釈乱流予混合火炎の局所曲率と幾何学的構造に関する研究

第47回燃焼シンポジウム　2009/12
高当量比水蒸気希釈メタン/酸素火炎の高圧下における層流燃焼速度

第47回燃焼シンポジウム　2009/12
準定常近似に基づく簡略化反応機構によるエタノール火炎の2次元数値計算

第47回燃焼シンポジウム　2009/12
衝撃波と干渉する壁面噴流場の三次元流れ構造に関する研究

第47回燃焼シンポジウム　2009/12
非一様速度場を伝播する予混合火炎のダイナミクス：固有不安定性と放射の複合効果

第47回燃焼シンポジウム　2009/12
A Study of Turbulent Combustion Mechanism in a Packed Pebble Bed at High Pressure International-presentation

Sixth International Conference on Flow Dynamis　2009/11
Dynamics of Premixed Flames Propagating in Non-Uniform Velocity Fields:Combined Effects of Intrinsic Instability and Radiation International-presentation

AFI/TFI-2009　2009/11
Estimation of Kinetic Parameters of Polymer Pyrolysis in High-Temperature Air Combustion Combining Experiment and Numerical Analysis International-presentation

Sixth International Conference on Flow Dynamis　2009/11
Microgravity Experiment and Numerical Simulation on Droplet Combustion in Varying Forced Convection at Elevated Pressure International-presentation

Sixth International Conference on Flow Dynamis　2009/11
高圧下変動速度場における液滴燃焼速度定数増大のメカニズムについて

日本機械学会熱工学コンファレンス2009　2009/11
Characteristics of Flow Field Around Wall Injection Interacting with Incident Shock Wave in Supersonic Airstream International-presentation

7th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics　2009/06
Recent Progress in High-Pressure Combustion Research International-presentation

7th Asia-Pacific Conference on Combustion　2009/05/27
Generation of a Reduced Kinetic Mechanism of Ethanol and Application to 1-d and 2-d Numerical Simulations International-presentation

7th Asia-Pacific Conference on Combustion　2009/05
Numerical Analysis of CH4/O2 Premixed Flames Diluted by Superheated Steam at High Pressure International-presentation

7th Asia-Pacific Conference on Combustion　2009/05
衝撃波と干渉する噴流場の三次元構造

日本航空宇宙学会北支部2009年講演会ならびに　2009/03
PTVおよびPLIF同時計測によるしわ状層流火炎の挙動に関する研究

第46回燃焼シンポジウム　2008/12
Unsteady Behavior of Single Droplet Combustion in Oscillatory Flow Field under Microgravity Condition International-presentation

The Eighth International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration　2008/12
高温高圧下における水蒸気希釈乱流予混合火炎の構造と排出ガス特性

第46回燃焼シンポジウム　2008/12
超音速流における衝撃波と干渉する噴流場に関する実験および数値解析

第46回燃焼シンポジウム　2008/12
予混合火炎のダイナミクスに及ぼす放射の影響：固有不安定性と放射の複合効果

第46回燃焼シンポジウム　2008/12
BIRURCATIONS OF STRETCHED PREMIXED FLAME STABILIZED BY A HOT WALL International-presentation

32nd international Symposium on Combustion　2008/08
Dilution Effects of Superheated Water Vapor on Turbulent Premixed Flames at High Pressure and High Temperature International-presentation

32nd International Symposium on Combustion　2008/08
Microgravity Experiments of Single Droplet Combustion in Oscillatory Flow at Elevated Pressure International-presentation

32nd international Symposium on Combustion　2008/08
衝撃波と干渉する噴流場の構造に関する実験および非定常数値解析

日本航空宇宙学会北部支部講演会　2008/03
衝撃波と干渉する噴流場の構造に関する実験および非定常数値解析

日本航空宇宙学会北部支部　2008/03
微小重力環境を利用した高圧下における液滴火炎の流速変動への応答に関する研究

第24回宇宙利用シンポジウム　2008/01
Effects of Flame Stretch and Heat Loss on Local Burning Velocities for Two-dimensional Bunsen Flames International-presentation

Yasuhiro Ogami, Hisashi Nakamura, Hideaki Kobayashi

The Seventh International Symposium on Advanced Fluid Information　2007/12/14
The Mechanism of Response Time Delay to the Flow Oscillation in Unsteady Droplet Combustion under Microgravity at High Pressure International-presentation

Mehdi Jangi, Shoichi Hasegawa, Satoru Sakurai, Yasuhiro Ogami, Kentaro Yoshinaga, Hisash Nakamura, Hideaki Kobayashi

The Seventh International Symposium on Advanced Fluid Information　2007/12/14
PTV Measurement and Numerical Simulation of Wall Injection Interacting with Incident Shock Wave in Supersonic Flow International-presentation

Shunsuke Ishida, Naoki Sato, Hisashi Nakamura, Yasuhiro Ogami, Hideaki Kobayashi

The Seventh International Symposium on Advanced Fluid Information　2007/12/14
よどみ点流れにおけるポリプロピレン燃焼に対する酸化剤の温度及び組成の影響

吉永健太郎, 小林秀昭

第45回燃焼シンポジウム　2007/12/05
微小重力高圧下の非定常強制対流場における液滴燃焼－準定常理論の有効性限界について－

Mehdi Jangi, 長谷川翔一, 櫻井悟, 大上泰寛, 中村寿, 吉永健太郎, 小林秀昭

第45回燃焼シンポジウム　2007/12/05
高温高圧下における水蒸気希釈乱流予混合火炎に関する研究

矢田創一郎, 金子秀明, 大上泰寛, 小林秀昭

第45回燃焼シンポジウム　2007/12/05
エタノール簡略化反応機構の多次元数値解析への適用に関する研究

奥山昌紀, 川瀬雅大, 大上泰寛, 中村寿, 小林秀昭

第45回燃焼シンポジウム　2007/12/05
壁面噴射場における燃焼と流れ場の非定常性に及ぼす入射衝撃波の影響について

中村寿, 佐藤直樹, 石田俊輔, 先光吉宗, 小林秀昭

第45回燃焼シンポジウム　2007/12/05
入射衝撃波と干渉する水素壁面噴射場の保炎機構に関する研究

佐藤直樹, 石田俊輔, 中村寿, 大上泰寛, 小林秀昭

第45回燃焼シンポジウム　2007/12/05
メタン層流予混合火炎の水蒸気希釈による影響

大上泰寛, 玉置裕一, 熊上学, 小林秀昭

第45回燃焼シンポジウム　2007/12/05
微小重力高圧環境下における単一液滴燃焼の流速変動への応答

小林秀昭, 長谷川翔一, 大上泰寛, Mehdi Jangi, 吉永健太郎, 中村寿

熱工学コンファレンス2007　2007/11/23
Effects of Water Vapor Dilution on Turbulent Premixed Flames at High Pressure and High Temperature International-presentation

Soichiro Yata, Hideaki Kobayashi, Yasuhiro Ogami

Fourth International Conference on Flow Dynamics　2007/09/26
A Study of Flow Field of Wall Injection Interacting with Incident Shock Wave Using PTV and Numerical Simulation International-presentation

Syunsuke Ishida, Naoki Sato, Hisashi Nakamura, Yasuhiro Ogami, Hideaki Kobayashi

Fourth International Conference on Flow Dynamics　2007/09/26
Reduced Kinetic Mechanism of Ethanol for Multi-dimensional Combustion Analysis International-presentation

Masaki Okuyama, Masao Kawase, Yasuhiro Ogami, Hisashi Nakamura, Hideaki Kobayashi

Fourth International Conference on Flow Dynamics　2007/09/26
Effects of Air Dilution with N2, H2O and CO2 on Regression and Extinction of Polypropylene Combustion in Stagnation Point Flow International-presentation

Kentaro Yoshinaga, Hideaki Kobayashi

Fourth International Conference on Flow Dynamics　2007/09/26
Effect of the Location of an Incident Shock Wave on Combustion of Hydrogen Crossflow Jet in Supersonic Airstream International-presentation

Hisashi Nakamura, Naoki Sato, Hideaki Kobayashi

The 2nd SNU-TU Joint Workshop on Next Generation Aero Vehicle　2007/06/18
Unsteady Behavior of Droplet Combustion in Varying Force Convection at High Pressure in Microgravity - Hysteresis of Burning Rate Constant - International-presentation

Mehdi Jangi, Satoru Sakurai, Shoichi Hasegawa, Yasuhiro Ogami, Kentaro Yoshinaga, Hisashi Nakamura, Hideaki Kobayashi

The 2nd SNU-TU Joint Workshop on Next Generation Aero Vehicle　2007/06/18
PTV計測を用いた衝撃波と干渉する壁面噴射場の保炎機構の研究

佐藤直樹, 中村寿, 石田俊輔, 大上泰寛, 小林秀昭

日本航空宇宙学会北部支部20周年記念講演会　2007/03/07
ブンゼン火炎の局所燃焼速度に対する熱損失及び伸長の影響

大上泰寛, 中村寿, 小林秀昭

第44回燃焼シンポジウム　2006/12/06
超音速流における水素垂直噴射場の燃焼に及ぼす入射衝撃波の影響

中村寿, 佐藤直樹, 小林秀昭, 升谷五郎

第44回燃焼シンポジウム　2006/12/06
高圧下における水素添加乱流予混合火炎に関する研究

金子秀明, 矢田創一郎, 大上泰寛, 小林秀昭

第44回燃焼シンポジウム　2006/12/06
微小重力環境を利用した高圧下の液滴燃焼における空気流速変動の影響に関する研究

櫻井悟, Mehdi Jangi, 大上泰寛, 小林秀昭

第44回燃焼シンポジウム　2006/12/06
非一様速度場を伝播する予混合火炎の動的挙動－乱れ強さの影響－

門脇敏, 狩野秀太, 小林秀昭

第44回燃焼シンポジウム　2006/12/06
高圧環境下の予混合燃焼における水素添加の影響

小林秀昭, 金子秀明, 矢田創一郎, 大上泰寛

日本機械学会熱工学コンファレンス2006　2006/11/24
Numerical Study of Gas Radiation Effects of High-Temperature Air Diluted With H2O And CO2 on Polypropylene Combustion International-presentation

Kentaro Yoshinaga, Hideaki Kobayashi

1st Japan Korea Student Workshop　2006/11/13
Experimental and Numerical Study of Polypropylene Combustion in High-temperature Air diluted with Carbon Dioxide and Water Vapor International-presentation

Kentaro Yoshinaga, Hideaki Kobayashi

3rd International Conference on Flow Dynamics　2006/11/07
Microgravity Experiments on the Effects of Air-flow Variation on Droplet Combustion at High Pressure International-presentation

Mehdi Jangi, Satoru Sakurai, Yasuhiro Ogami, Hideaki Kobayashi

3rd International Conference on Flow Dynamics　2006/11/07
Microgravity Experiments on the Effect of Air-flow Variation on Droplet Combustion at High Pressure International-presentation

Mehdi Jangi, Satoru Sakurai, Yasuhiro Ogami, Hideaki Kobayashi

6th International Symposium on Advanced Fluid Information: AFI-2006　2006/10
Gas Dilution Effects on Turbulent Premixed Flames at High Pressure and High Temperature International-presentation

10th International Workshop on Premixed Turbulent Flames　2006/08/12
Effect of an Incident Shock Wave on Hydrogen Combustion for Wall Injection in Supersonic Flow International-presentation

Hisashi Nakamura, Naoki Sato, Hideaki Kobayashi, Goro Masuya

31st International Symposium on Combustion　2006/08/06
Numerical Study of Polypropylene Combustion in High Temperature Oxidizer diluted with H2O and CO2 International-presentation

Kentaro Yoshinaga, Hideaki Kobayashi

31st International Symposium on Combustion　2006/08/06
Combustion of Hydrogen Jet in Supersonic Air Flow with Incident Shock Wave International-presentation

Hisashi Nakamura, Naoki Sato, Hideaki Kobayashi, Goro Masuya

Tohoku-SNU Joint Workshop on Next Generation Aero Vehicle　2006/07/27
Experimental Study of Turbulent Premixed Flames Diluted with CO2 at High Pressure and High Temperature International-presentation

NRL Workshop on Combustion Dynamics in Aerospace Propulsion Engines　2006/06/23
Integration Method of Particle Tracking Velocimetry and Numerical Simulation to Control Supersonic Combustion International-presentation

Hisashi Nakamura, Naoki Sato, Hideaki Kobayashi

3rd International Symposium on Transdisciplinary Fluid Integration　2006/06/12
入射衝撃波の位置が壁面噴射場における燃焼と流れ場に及ぼす影響について

中村寿, 佐藤直樹, 小林秀昭, 升谷五郎

日本航空宇宙学会北部支部２００６年講演会および第7回再使用型宇宙推進系シンポジウム　2006/03/09

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Industrial Property Rights 1

固体粒子供給装置および固体粒子濃度調整方法とその製造方法

小林秀昭, 佐藤直樹, 中村寿

特許登録第 4625960 号

Property Type: Patent

Research Projects 42

Laminar flame structures and turbulent flame characteristics of ammonia flames at high temperature and high pressure conditions

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2021/04/01 - 2024/03/31
高温高圧下における液体アンモニアおよびアンモニア水溶液の噴霧燃焼実現と現象解明

小林秀昭, 早川晃弘

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2020/04/01 - 2023/03/31

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本研究は，CO2を排出しない無機燃料である液体アンモニア(NH3)ならびに質量濃度47%までのアンモニア水溶液の高温高圧下における直接噴霧燃焼を実現し，減圧沸騰蒸発過程を有する噴霧燃焼の現象解明を行う．アンモニアは水素と並ぶCO2無排出燃料であると共に，水素に比較して保存や輸送が容易であるという優れた特徴を有している．高圧ボンベに貯蔵された液体アンモニアを加温・再加圧することなく直接噴霧燃焼させた場合の高温高圧下の乱流火炎構造と火炎安定条件，排ガス特性を実験的に明らかにし，アンモニアガスタービンへの応用に向けた基礎データを取得する．さらに，液体アンモニア噴霧燃焼をレファレンスとしてアンモニア水溶液の噴霧燃焼研究を行うことで，新しいカーボンフリー燃焼の学理構築に資する．令和３年度は，接線スワーラを内蔵した燃焼器において，昨年度成功した質量濃度30%までのアンモニア水溶液の常温空気およびメタン混焼による火炎安定化成功，レファレンスとして実施した600 Kまで予熱した空気流に対する液体アンモニア噴霧の火炎安定化成功を受けて，火炎安定化メカニズムを噴霧構造の観点からより詳細に明らかにする実験と数値解析を実施した．実験では，ホロコーンノズルによる減圧沸騰を生じる液体アンモニア噴霧と減圧沸騰を生じない水噴霧との微粒化過程の違いの可視化，ならびにダブルパルスレーザーの光干渉縞を利用して空間粒子密度の高い噴霧からの２次散乱光の影響を抑制してレーザートモグラフィーを可視化できるSLIPI法の実施，数値解析では，液体アンモニアの減圧沸騰を解析できる数理モデルを用いた非燃焼時の液体アンモニア噴霧構造の可視化，ならびに水素混焼によるアンモニア噴霧燃焼の３次元数値解析を実施した．
Laser-induced fluorescence measurement of gas-liquid multiphase diffusion flames in high-pressure rocket combustion

Kobayashi Hideaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2020/07/30 - 2022/03/31

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OH planer-laser-induced fluorescence measurement for gas-liquid multiphase hydrogen combustion at high pressure and high temperature applicable for rocket combustion was developed. OH(2,2) fluorescence band measurements were performed for gas H2/O2 diffusion flames at up to 5.0 MPa, and a clear flame structure with S/N ratio greater than 4 was obtained. OH(2,2) fluorescence band measurement was also applied to the gas-liquid multiphase hydrogen/liquid oxygen combustion at 3.0 MPa, and the flame structure could be observed with S/N ratio of about 2. In combustion experiments of methane/oxygen/nitrogen premixed flames up to 0.5 MPa with oxygen enrichment up to 60%, OH(2,0) band excitation and bi-directional LIF technique were combined for quantitative measurement of OH concentration, and good agreement was obtained with numerical analysis.
高温高圧環境下におけるアルコール系C3・C4混合バイオ燃料の乱流燃焼機構の解明

小林秀昭, 早川晃弘

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(B)

Category: 基盤研究(B)

Institution: 東北大学

2017/04/01 - 2020/03/31

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本研究課題は，燃焼科学の先端研究分野である高温高圧乱流燃焼において，非食料バイオマスから生産されるアルコール系C3，C4バイオ燃料およびその混合燃料の乱流燃焼機構を明らかにし，極限環境乱流燃焼の学理構築を図りCO2排出削減燃焼技術へ寄与することを目的とする．具体的にはエンジン燃料として有効なプロパノール異性体，ブタノール異性体ならびにそれら混合燃料の乱流予混合火炎を高温高圧下で安定化させ，１）乱流燃焼速度および乱流火炎構造，２）中間化学種CH2O，NO，OHのレーザー計測による局所濃度分布，３）燃焼排出ガス組成を明らかにし，アルコール系C3・C4バイオ燃焼に対する乱流燃焼の異性体効果，混合組成効果，温度圧力依存性に対し，反応動力学と局所火炎不安定性原理に基づくメカニズム解明を行う．平成30年度は、前年度に燃焼試験を実施した液体燃料蒸発装置が組み込まれた高圧燃焼試験設備の大型燃焼容器に加え，装置ハンドリングに優れた最大圧力1.0 MPaの小型高圧容器を用い，C3アルコール燃料であるn-プロパノール，iso-プロパノール， C4アルコール燃料である1-ブタノール， iso-プロパノールを用い0.3 MPaまでの高圧環境で乱流予混合火炎を安定化させ，OH-PLIF, CH2O-PLIF同時計測に成功した．その結果，CH2Oの方がOHよりも上流側に分布していることが確認され，1次元数値解析と同様の結果を得て数値解析の妥当性が示された．更に，OH-PLIF, CH2O-PLIFのオーバーラップから発熱領域を特定することに成功するとともに，CH2O分布からC2H2, C2H4分布を推定し，異性体バイオ燃料における中間化学種拡散効果を検討した.
Spectroscopic development of laser-induced fluorescence method using higher energy band excitation for rocket combustion diagnostics

KOBAYASHI Hideaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2015/04/01 - 2017/03/31

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In order to achieve OH-Planar Laser-Induced Fluorescence (OH-PLIF) measurements to rocket combustion which emits intense chemiluminescence, OH(2,0) band excited OH-PLIF method was developed in this study. The OH(2,1) band fluorescence was detected effectively by eliminating the interference of intense OH(0,0) band chemiluminescence, and the images of two-dimensional instantaneous OH distribution in H2/O2 jet diffusion flames were successfully acquired up to 5.9 MPa. Moreover, a calibration burner capable of adapting to high pressure and temperature flame conditions was designed to establish the quantitative optical measurement methods for rocket combustion. The oxygen-enriched CH4/O2/N2 laminar quasi one-dimensional flames were stabilized on the burner up to 0.49 MPa, with maximum flame temperature simulated to be higher than 2900 K. From these results, the primal requirements of the calibration burner were sufficiently archived.
Turbulent combustion mechanism and emission characteristics of next-generation C4-biofuel isomers in a high-pressure and high-temperature environment

KOBAYASHI Hideaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2014/04/01 - 2017/03/31

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To explore the turbulent combustion mechanism of next-generation C4-biofuel isomers in a high-pressure and high-temperature environment, OH-PLIF for n-Butanol and iso-Butanol flames has been performed at pressure up to 1.0 MPa. It was found that in the regime of low turbulent intensity, maximum flame surface density of n-Butanol flame is smaller than that of iso-Butanol flame, indicating an isomer effects of biofuels at high pressure related to local structure of Butanol flames. Simultaneous measurement of NO-PLIF and OH-PLIF has been also succeeded and agreement with numerical analysis in terms of strong diffusion of NO has been confirmed. For four kinds of isomer fuels of Butanol and Butane, measurement of CO and NO emissions has been performed. CO and NO emissions from Butanol flame is weak because of oxygen containing effects, while NO emission from n-Butane flame is strongest, the mechanism being investigated based on reaction path analysis using detail chemistry.
Ground experiment of the innovative sonic boom reduction technology

OBAYASHI Shigeru, KOBAYASHI Hideaki, ASAI Keisuke, NAGAI Hiroki, OGAWA Toshihiro, SAITO Tsutomu, KAWAZOE Hiromitsu, CHIBA Kazuhisa, NUMATA Daiju

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2011/04/01 - 2015/03/31

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Design and evaluation systems for supersonic vehicles are constructed in this research to develop a low-boom supersonic vehicle based on Supersonic Biplane Theory. The following experimental and numerical simulation techniques were developed: free flight experiment of three-dimensional projectiles, surface pressure distribution measurement using ultrafast response pressure-sensitive paint, a calibration technique of pressure waveforms by the multipole method, a force balance measurement system in a supersonic wind tunnel, sonic boom estimation with consideration of the real atmospheric conditions, and design optimization and exploration for unsteady phenomena.
Flame structure and flame stabilization mechanism of oxygen jet diffusion flame in a high-pressure environment

KOBAYASHI Hideaki, HAYAKAWA Akihiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2012/04/01 - 2014/03/31

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To develop safely operation method and designing mixing apparatuses for chemical plants, which mixes pure oxygen and combustible gases, characteristics of oxygen jet diffusion flames and flame stability limits in a high-pressure environment were performed. Both coaxial jet diffusion flames and transversal jet diffusion flames for pure oxygen jet in a main fuel flow were examined. Methane was used as a fuel. Results showed that, in the case of the coaxial jet flames, oxygen jet velocity is predominant for the flame stabilization and small vortexes formed at the lip of the jet tube enhance the flame stabilization. In the case of the transversal oxygen jet flames, the flow which reaches to the opposite wall plays an important role of flame stabilization, as well as flame oscillation occurs near the injection wall caused by the interaction between heat loss to the wall and high heat release in thin boundary layer at high pressure, leading to the total blow out of the flame.
Turbulent combustion mechanism of isomer bio-fuels in a high-pressure, high-temperature environment

KOBAYASHI Hideaki, HAYAKAWA Akihiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2011/04/01 - 2014/03/31

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For the fundamental combustion research of isomer biofuels, experiments of propanol isomers and propane turbulent premixed flame using OH-PLIF were performed in a high pressure environment. The local flame surface density for each fuel was analyzed from instantaneous turbulent flame images of cross-section. The results of the flame surface density analysis indicated differences of intrinsic flame instability for 1-propanol, 2-propanol and propane. Numerical simulations of intrinsic flame instability using a two-step reaction model as well as 1-D laminar flames using detail chemistry for propanol and propane/air mixtures were carried out to clarify the relationship between chemical reaction and flame instability. It was clarified that turbulent flame structure is highly affected by the diffusive thermal effects of C2 intermediate species, which depends on the isomer fuels and differences in dissociation reaction pathway.
クリーンエネルギーシステムの基盤となる高圧下における改質ガス乱流燃焼の基礎的研究

小林秀昭, WANG JInhua, WANG Jinhua

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特別研究員奨励費

Category: 特別研究員奨励費

Institution: 東北大学

2010 - 2011

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本研究は,環境・エネルギー技術の中核である燃焼技術において,パワープラントで高い熱効率が得られるクリーンエネルギーシステムとして将来重要な役割を果たすと期待される,石炭改質ガス複合サイクル(IGCC)におけるガスタービン燃焼に注目する.そのガスタービンの高温高圧環境を模擬した燃焼場における一酸化炭素および水素を主成分とする層流および乱流燃焼機構を解明し,純酸素燃焼によって二酸化炭素回収と貯蔵(CCS)への展開も見据えた基礎研究を実施する. 本年度は,はじめに昨年度実施した層流燃焼速度に関する数値解析結果に基づいて高圧乱流燃焼実験の条件設定を行った.高圧乱流燃焼実験では圧力を0.5MPaおよび1.0MPaとし,石炭改質ガスを模擬してCO_2:65%,H_2:35%の混合燃料に純酸素を混合し当量比を1.0とした.さらに再循環ガスを模擬したCO_2で希釈して所定の層流燃焼速度となる予混合気を用いた.乱流燃焼実験の主な計測内容はOH-PLIF計測であって,取得した火炎断面画像から乱流燃焼速度,火炎面密度の空間分布などを求めた.その結果,石炭改質模擬ガスによる乱流予混合火炎の構造は,従来のメタン・空気乱流予混合火炎に比較して,局所火炎の凹凸の微細化が顕著であり,一方で乱流火炎領域の体積が小さいことがわかった.このことは,IGCCシステムの中核であるガスタービンが予混合燃焼モードで使用される場合,燃焼振動を起こしやすい特性をもつことを意味している.火炎領域の微細化は予混合ガスの熱物性特性や層流燃焼速度,およびWang氏が来日前に本国で行った層流燃焼の予備実験とも一致する結果であり,今後共同研究を進める共通のテーマとなる.
On the mechanism of turbulent premixed combustion in a porous pebble bed at high pressure and high temperature

KOBAYASHI Hideaki, OGAMI Yasuhiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2010 - 2011

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Flame propagation experiments were performed for a pebble bed at high pressure and high temperature. Flame speed in the bed was measured and OH-PLIF of the propagating flame front was performed. Results showed that the mode of the flame speed changed with increasing pressure and the flame becomes turbulent flame even though it propagates through very small matrix channels. Flame propagation limit was also observed and the limit was proved to be determined by the competition between heat release from the flame and heat loss to the pebbles.
On the mechanism of turbulent premixed combustion for CO as a major fuel component at high pressure and high temperature

KOBAYSHI Hideaki, OGAMI Yasuhiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2008 - 2010

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Assuming coal gasification syngas combustion, turbulent premixed flames for the mixtures of CO/H2 and air as well as pure O2 diluted with large amount of CO2 were stabilized in a high pressure environment and the measurement of turbulent burning velocity, mean volume of turbulent flame region, flame surface density, radiation intensity, etc. were performed. It was proven that structure of turbulent flame region became very fine, being related the change in flame surface density and mean flame volume, and the radiation intensity became strong.
A Study of Turbulent Combustion Mechanism in a High-Pressure, High-temperature and High Water-vapor Environment

KOBAYASHI Hideaki, OGAMI Yasuhiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2005 - 2006

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The purpose of this project is to explore turbulent combustion mechanism for low oxygen mixture highly diluted with water vapor considering the applications of exhaust gas recycling to high-load combustion at high pressure. Because the exhaust gas consists of water vapor, carbon dioxide and nitrogen, the effects of dilution especially with water vapor and carbon dioxide on combustion characteristics were investigated systematically. For turbulent and laminar premixed flames from ordinary pressure to high pressure, flame structure and burning velocity were measured using laser diagnostic methods. In the first year, parallel to the experiments on carbon dioxide dilution effects on high-pressure turbulent premixed flames, an apparatus to generate water vapor in a high-pressure environment using a copper cylinder, rod heaters and steel wool connected to a water mass-flow controller was developed and it was confirmed that the apparatus stably provided water vapor over a wide range of water supply. Using the apparatus, differences in light emission from the flames depending on the dryness of the mixture were confirmed. In the second year, experiments for turbulent premixed flames diluted with water vapor up to 0.1 of moler fraction were successfully performed at high pressure and high temperature. By using OH-PLIF, profiles of the mean progress variable based on 500 OH-PLIF images were analyzed and the turbulent burning velocity and mean volume of the turbulent flame region were measured, and then compared with those for carbon dioxide dilution. Moreover, simultaneous measurement of OH-PLIF and PTV was performed for laminar flames to measure the laminar burning velocity and the effects of water vapor. As a result, it was found that the burning velocity for the mixtures diluted with water vapor was larger than that of numerical simulation in the fuel rich region and it was implied that fuel reforming reactions causes the phenomenon. Also, it was found that concentration of carbon monoxide in the burnt gas was reduced as an effect of the water vapor addition.
Study of physics and practical applications of laser-driven in-tube accelerator

SASOH Akihiro, TANIUCHI Tetsuo, KOBAYASHI Hideaki, SAWADA Keisuke, YAMAGUCHI Shigeru, HORISAWA Hideyuki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2001 - 2005

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Basic and application studies were conducted on the laser-driven, in-tube accelerator which had been developed by the head investigator. The operation principle was experimentally validated in 4-m-high vertical launch experiment. The impulse generation mechanisms were experimentally and numerically studied by highlighting the interactions among shock waves, expansion waves and laser-generated plasma and accompanying fluid-dynamics instabilities. A scaling law of its propulsion performance was established. The impulse enhancement using laser ablation was experimentally demonstrated. Those are useful for practical applications. In this device, the momentum coupling coefficient, which is defined as the ratio of an impulse to a laser energy, can be tripled owing to a confinement effect and with appropriate setting of the working gas species and its fill pressure. The momentum coupling coefficient scales with the reciprocal of the speed of sound, which was experimentally validated using three kinds of monoatomic gases, argon, krypton and xenon. The secondary effect of their ionization potential on the impulse was also obtained. The impulse performance is uniquely characterized using a dimensionless momentum coupling coefficient, the dimensional momentum coupling coefficient multiplied by the speed of sound, and a dimensionless parameter, the ratio of the fill pressure multiplied by an effective projectile volume to the laser energy. From the experimental and numerical analysis, it is concluded that the impulse performance can be optimized from the effective expansion volume of the laser plasma. In the laser-ablative performance experiment, polyacetal exhibited the best performance ; its impulse is sensitive to the ambient pressure. At an appropriate laser fluence, the impulse becomes highest at ambient pressures below 100 Pa. This favorable performance can be useful not only for improving the propulsive performance of the device but also for other various space applications including space debris deorbiting.
A Study of Turbulent Combustion Mechanism in a High Temperature, High-Pressure, and Low-Oxygen Environment

KOBAYASHI Hideaki, OGAMI Yasuhiro, FUJIMORI Toshiro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2003 - 2004

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This project aims to extend the research of high-pressure and high-temperature turbulent combustion to the low oxygen concentration combustion in terms of utilizing for new premix-type gas turbine combustors with an exhaust gas recirculation. Turbulent premixed flames and turbulent non-premixed flames using oxidizer diluted with N_2 and CO_2 were investigated. Observation and analysis of instantaneous flame structure using OH-PLIF and CH-PLIF were conducted. Measurements of turbulence characteristics, NOx emission, and turbulent burning velocity were also performed. For turbulent non-premixed flames, oxidizer preheated up to 1300 K, whose oxygen concentration was 4 vol % minimum diluted with CO_2 and N_2 were visualized using CH-PLIF. It has been proved that bubble-like flame structures are formed especially in the case of lifted flames. Low NOx emission has been also confirmed even for non-lifted flame using a NOx analyzer. For turbulent premixed flames, flame stabilization for the methane-air mixture preheated up to 573 K diluted with CO_2 at pressure up to 1.0 MPa has been succeeded. The oxygen concentration of the mixture could be reduced up to 10 vol % simulating the condition of premix-type gas turbine combustors with exhaust gas recirculation. Instantaneous OH-PLIF images were obtained and fractal analysis was performed to explore the effects of intrinsic flame instability on CO_2 diluted premixed flames. Moreover, Turbulent burning velocity and time-averaged production rate of product species were determined. As a result, turbulent premixed flames for low oxygen concentration due to CO_2 dilution at high pressure and high temperature increases the volume of heat release region and reduces the time averaged production rate of combustion products, leading to mild heat releasing. These characteristics are an important factor for reducing combustion instability of premix-type gas turbine combustors and profitable features in terms of realizing new premix-type gas turbine combustors with exhaust gas recirculation proposed in this research project.
二酸化炭素希釈酸化剤を用いた層流浮き上がり拡散火炎の構造と安定機構

小林秀昭, RUAN J

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東北大学

2002 - 2004

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本研究では、石炭ガスあるいはバイオマスなど廃棄物の熱分解ガス(CO,H_2とCH_4)の単一ガスおよびそれらの混合物ガス燃料と、CO_2で希釈された酸化剤から構成された層流浮き上がり拡散火炎の火炎構造と安定機構を、実験および詳細な反応機構と輸送特性を考慮した数値解析によって解明することを目的とする。本研究の目的を達成するために、三年度に分けて実行すると計画した。昨年の9月までに、計画の通り研究目標を達成しました。16年度では、前年度に単一燃料ガス(CO,CH_4とH_2)とそれらの混合ガス燃料を用いて層流噴流浮き上がり拡散火炎実験により各種類火炎の基本現象を明らかにした上で、特に一酸化炭素の強い毒があり、高精度な実験が難しくなるので、(CO+CH_4)火炎の燃料比だけ変化につれて発生した新しい現象(Hysteresis現象)を注目し、数値解析で詳細的な研究を行った。(CO+CH_4)火炎は燃料比(CH_4/(CH_4+CO))変化につれて浮き上がり火炎の安定性を解析した。噴流速度を同じに制御した(CO+CH_4)火炎は燃料比変化につれて浮き上がり火炎の安定性(浮き上がり高さ、H_1、で表す、火炎の基部から噴流バーナの出口までの距離)を解析し、Hysteresis現象を数値的に始めて発見した。COとCH_4浮き上がり火炎の構造と安定性において大きいな違いがあり、その要因はメタンと一酸化炭素の化学反応特性の大きいな違いであることを明らかにした。
Study of the Effect of Shock Wave on Fuel Injection and Combustion

NIIOKA Takashi, HANAI Hironao, KOBAYASHI Hideai, MASUYA Goro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

2002 - 2003

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To clarify the phenomena of the interaction between shock wave and combustion in scramjet engine combustors at low Mach numbers, the fundermental research was performed experimentally and numerically flame-holding characteristics of hydrogen injected vertically to the wall surface. The following results ware obtaind : 1.When the shock wave was introduced in the upstream of injection slit, the position of the detached shock wave moved to the upstream. As a result, we could hold the flame even at low total temperatures and injection pressures. 2.The LU-SGS method was improved to be made in parallel imaginarily by a discrete region method. 3.Numerical results were qualitatively consistent with experimental ones. Since the most hydrogen stayed in the downstream detached region and reacted there, the incident shock wave introduced in the downstream detached region was more effective compared with the case introduced in the upstream of the injection slit, when the equivalence retio was small and the hydrogen temperature was low. The flame-holding in the latter case, however, could not be analyzed completely because of complex turbulent diffusion. 4.By changing from the two-dimensional fuel slit jet to a single circular slot jet, fuel injection pressure could be raised without thermal choke. Also, a new measurement method of supersonic flows was developed by linking PTV with CFD.
Effective Air Separation Applied to Low Emission Energy System

MARUYAMA Shigenao, TSUKADA Takao, KOBAYASHI Hideaki, KAMIJO kenjiro, FUJIMA Katsumi, OIKE Mamoru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2000 - 2002

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Improvement of a cryogenic air separation system combined with O_2/CO_2 combustion process are Studied. An improved air separation process for O_2/CO_2 combustion plant is proposed and simulated. A conventional cryogenic air separation plant loses much exergy in the air compression process. One of the methods to reduce energy consumption in the air compression process is to adopt a single rectification column instead of a double rectification column. The single column process is possible to operate at lower pressure. In result, the energy consumption for O_2 production is reduced by 14% compared with the double column process. One of the other methods to reduce the energy consumption for air separation is utilizing cold exergy of LNG for the air separation process in a LNG fired power plant. We proposed a novel process to utilize the LNG cold exergy for the air separation, and simulated. The low temperature compression of air is performed to reduce the energy consumption. The LNG cold exergy is utilized at low temperature to increase the efficiency of cold exergy. The energy consumption for O_2 production is reduced by 40.7% compared with the conventional one, and the efficiency of LNG cold exergy becomes 57.3%. Improvement of performance in a cryogenic heat exchanger is necessary to reduce the energy consumption. A fibrous media heat exchanger in proposed, which has large heat transfer area. Experiments and numerical simulations are performed to estimate the performance of the heat exchanger in cryogenic operation. The fibrous media heat exchanger has higher thermal efficiency than conventional packed beds regenerators, when the heat exchanger length is short. Effect of frost deposition caused by water vapor in the air is estimated for continuous operation. The frost deposition occurs where the temperature gradient is large, and the amount of frost increases linearly to the operating time.
Elucidation and Modeling of Turbulent Premixed Combustion Phenomena in a High-Pressure and High-Temperature Environment

KOBAYASHI Hideaki, FUJIMORI Toshiro, HANAI Hironao

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2000 - 2001

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This research aimed to explore turbulent combustion phenomena at high pressure and high temperature. Turbulent premixed flames for preheated mixture stabilized in a high-pressure chamber were investigated. Precise observations of the flame and measurement of turbulent burning velocity and the smallest scales of flame wrinkling due to Darrieus-Landau hydrodynamic instability were performed. Effects of pressure and preheating were examined and the turbulent combustion model at high pressure and high temperature was developed. Electrical heater of the air was developed and installed in the high-pressure chamber for the present experiment. The maximum pressure and temperature were 1.0 MPa and 573 K because of the limitation of high-temperature seals. Methane/air mixtures were used for the experiments. The fractal inner cutoff of OH-PLIF images as the smallest scale of flame wrinkles was analyzed, and it was clarified that the significant correlation between the smallest wrinkling scale and characteristic scale of Darrieus-Landau hydrodynamic instability even at 573 K for large turbulence Reynolds number. Precise measurement of the energy spectrum of turbulence showed that Kolmogorov's similarity law for nondimensional energy spectrums of flow turbulence at high pressure and high temperature was confirmed, and a characteristic scale equivalent to the average vortex-tube diameter, which is about 10 times larger than the Kolmogorov scale can be considered as a scale corresponding to the largest wavenumber of initial flow disturbances. It was also shown that the smallest wrinkling scale becomes constant when this turbulence scale becomes smaller than the instability scale because of the effect of the Darrieus-Landau hydrodynamic instability. Measurements of laminar burning velocity at high-pressure and high-temperature were performed using simultaneous PIV and OH-PLIF methods developed in this research. Experiments for stoichiometric H2/O2/He mixture were performed first and then methane/air mixture was examined. Modification of the reaction mechanism was also performed. The numerical and experimental data were used for the analysis of the turbulent combustion. Finally, measurements of turbulent burning velocity based on image processing of OH-PLIF images were conducted and the model to estimate turbulent burning velocity at high-pressure and high-temperature based on turbulent Reynolds number was developed.
Development of a Simultaneous Measurement Method of Velocity, Temperature, and Concentration using a Diode Laser in a Supersonic Combustion Flow

KOBAYASHI Hideaki, FUJIMORI Toshiro, MITANI Tohru, HANAI Hironao

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B).

Institution: Tohoku University

1999 - 2000

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This research was aimed to develop a new measurement method of velocity, temperature, and concentration in supersonic combustion flow by using a compact diode laser. This method is based on the infrared absorption characteristics of H_2O molecules. A InGaSaP diode laser was selected to detect 1.393 μm band of H_2O vibration-rotation transition. The investigation of the transition lines of H_2O molecules proved that two pairs of transition line are suitable for the temperature measurement in the range of 1300 K - 2000 K and 300 K - 1300 K separately. By collaboration research with a scientist in USA, the diode laser controller, laser corrector optics, and the measurement code were developed, and the assembling of the optical fibers and diode-laser laser optics were conducted. By using a supersonic-combustion test facility of Institute of Fluid Science, Tohoku University, measurement tests of supersonic air-flow and the combustion flow behind a flame holding strut were conducted to confirm the performance of the system developed in this research. For installing the laser probes to the measurement section of the wind tunnel, AR coated optical windows, pin-hole structure, and nitrogen-purge system were employed in order to minimize the effects of the surface reflection, flame radiation, and laser absorption by surrounding air. Results of the measurements showed that, in supersonic air-flow, data of temperature and velocity agreed well with the numerically estimated values without any data compensation. H_2O concentration agreed with estimated value when the background H_2O concentration caused by the residual H_2O via the air reheater of the wind tunnel was reduced. The velocity data for the combustion region was compared with the mean velocity measured by LDV and they agreed well. H_2O concentration was also agreed well with the values estimated based on chemical equilibrium of H_2-air flames in the wake region. From these results, the accuracy and feasibility of the diagnostic method developed in this research were confirmed.
Development of New and High Performance Combustor with Low CO_2 Emission

TAKITA Kenichi, FUJIMORI Toshiro, KOBAYASHI Hideaki, MASUYA Goro

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B).

Institution: Tohoku University

1998 - 2000

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Theoretical and experimental investigations were conducted for development of new and high performance combustor with low CO_2 emission. The effect of an addition of CO_2, which absorbed the emission of flame to the unburned gas, on flammability limit and burning velocity was mainly investigated as a model of lean burning technology by using the re-circulation of burnt gas. In the numerical analysis, the reabsorption of radiation emitted from a flame resulted in broader flammability limit and larger burning velocity than those of the adiabatic flame. The burning velocity of the mixture including 10% CO_2 became larger than that of the mixture with no CO_2. Moreover, it was revealed in the analysis that the effect of radiation reabsorption more strongly appeared under high pressure condition than atmospheric pressure because of decrease in the optical thickness at high pressure. Extinction limit of counterflow premixed flame with CO_2 addition was experimentally measured in a high pressure vessel to verify the above theoretical results. Stretch rates at extinction monotonically decreased with the pressure and the concentration of CO_2, and the ratio of decrease was almost same for any condition. Therefore, the effect of radiation reabsorption was small under conditions of the experiment(0.5MPa(pressure), 15mm(diameter of burner)). On the other hand, strong instability of the flame surface due to a hydrodynamic instability at high pressure appeared in the experiment. Therefore, a consideration to such instability is important for a design of combustor used under high pressure condition.
CLALIFICATION OF FUNDAMENTAL PHENOMENA ON NON-EMISSION BURNING OF CO_2AND NOx

NIIOKA Takashi, HANAI Hironao, KOBAYASHI Hideaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B).

Institution: TOHOKU UNIVERSITY

1998 - 2000

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To develop a combustion system that is suitable for CO_2 recovery and has less emission of pollutants, a new combustion method using CO_2/O_2as oxidant has been proposed. However, the epically thin and gray-gas radiation model with Planck mean absorption coefficient, which has no reabsorption, has overestimated the emission, especially for "low-speed" flames. The effects of nongray radiation on the propagation and flammability limit of premixed CH_4/O_2/CO_2 flames were numerically analyzed. The results can be summarized as follows : 1. The nongray radiation effects described by the statistical narrow-band (SNB) model on the laminar burning velocity and flammability limit become larger as the dilution ratio of CO_2 is increased. 2. The gray radiation described by the optically thin model (OTM) loses effectiveness for higher CO_2 dilution ratios and lower equivalence ratios. An experimental and numerical study of diluent (CO_2 or N_2) effects on structure and stability of axisymmetric lifted laminar diffusion CH_4/(Diluent+O_2) flames were also performed over a wide range of the dilution ratio, Z.Results showed that 3. As increasing the Z, attached flames are lifted off at the Z_<lim> (0.72 for CO_2, 0.83 for N_2 diluted flame, respectively) and there were steady responses that the flame length. L_f, shortened and the lift off height, H_f, increased as well as the spreading out of the flame base in the radial direction until the Z_b (0.78 for CO_2, 0.86 for N_2 diluted flame, respectively). 4. The leading edge structure of the lifted flame has a triple flame, where fuel rich premixed wing is smaller than lean one and the trailing nonpremixed flame inclines immediately to the fuel side from trip point. 5. It is also shown that CO_2 effects are stronger than N_2 on the structure and stability due to high heat capacity and low transport rate of Co_2.
Research and Development of Two-staged Combustion Strut with Air Intake

NIIOKA Takashi, WAKU Yoshiharu, HANAI Hironao, KOBAYASHI Hideaki, NAKAGAWA Naruto

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1998 - 1999

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Flame holding technology is one of the most important technologies to realize the scramjet engine. Previous studies have shown that the flame stabilized by a strut in supersonic airflow is strengthened by premixing or preburning of fuel hydrogen with air which is injected into combustion zone behind the strut. Especially preburning is expected to improve the flame holding performance significantly because heat and active species produced by the first preburning are supplied to the secondary burning behind the strut. Considering the actual design or the number of engine parts, the feed of air or oxygen with hydrogen into a strut should be troublesome and complicated. Therefore, a direct introduction of air from the main supersonic airflow into the strut is proposed in this study. With respect to this strut with air intake and a preburner inside the strut, flame holding experiments were conducted in supersonic airflow and the following results were obtained. (1) Ignition in the preburner was not difficult and also flame holding was possible in a large extent of hydrogen flow rate by providing an air intake from the leading edge of the strut. (2) Ignition depended on the total temperature of air in the temperature range from 590 to 690 K, but the upper and lower limit of flame holding did not strongly depend on it. (3) Two types of flame holding were observed, namely combustion region did not attach to the rear end of the strut at low hydrogen flow rates and it attached at high hydrogen flow rates. (4) As hydrogen flow rate increased more, temperature in the preburner decreased rapidly, and the flame could not be maintained even in the secondary combustion region.
Investigation and Application of Fundamental Phenomena of Turbulent Premixed Combustion in a High-Pressure Environment

KOBAYASHI Hideaki, MARUTA Kaoru, HANAI Hironao

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1998 - 1999

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Turbulent premixed flames stabilized in a high-pressure atmosphere was studied with the aim of basic elucidation of phenomena of the high-pressure turbulent combustion which has not been explored precisely. The relationship between turbulence characteristics and turbulent flame structure under high pressure was clarified. Investigation of pressure effect for the fractal properties and turbulent burning velocity under high pressure were also made. The laminar flow nozzle-burner is installed in the pressure chamber, and OH-LIF technique were investigated at pressures from the atmospheric pressure up to 3.0 MPa. (0, 0) band and (1, 0) band of the OH radical were excited by an OPO tunable laser and a dye laser pumped by a Nd-YAG laser. The relationship between OH-LIF intensity and pressure was examined. In addition, a simulation considering effects of the broadening of laser line width and absorption spectrum was made and also compared with the experimental result. As the result, it was clarified that the effects of the absorption spectrum broadening was large for the LIF intensity degradation with the increase in pressure. Although the LIF intensity for larger laser line width is smaller than the case of smaller laser line width at atmospheric pressure, the decrease in LIF intensity with pressure is small for larger laser line width. It was proven that to estimate LIF intensity degradation under the high pressure was possible by calculating the overlap integral of laser spectrum profiles and absorption line spectral profiles. From these findings, guideline for the measurement condition of OH-PLIF at high-pressure was established. In continuing, the OH-PLIF method was applied to the instantaneous tomographic imaging of high-pressure turbulent flames. Especially, the fractal analysis of the OH-PLIF image was carried out as the technique which can quantitatively evaluate refinement and complication of the turbulent flame structure. As the result, it was proved that the fractal dimension for high-pressure flame was larger than atmospheric pressure flame even for equal u'/SィイD2LィエD2. The fractal inner cutoff decreased with pressure, but it was proven that the fractal inner cutoff was almost fixed in almost whole range of u'/SィイD2LィエD2 at high pressure. When various characteristic scales such as turbulent scales were compared with the fractal inner cutoff, it was proved that a characteristic instability scale, which corresponds to disturbance scale of maximum growth rate for the hydrodynamic instability, was well correlated to the fractal inner cutoff. These new findings which the hydrodynamic instability has dominant effects at high pressure were also confirmed by the observation of the flame instability with no initial turbulence in flow at high pressure.
Intelligent Electromagnetic Control of Chemically Reactive Plasma Flow by Infomations

NISHIYAMA Hideya, SATO Takehiko, KOBAYASHI Hideaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1997 - 1998

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The experimental and theoretical study was conducted to control chemically reactive plasma flow by applying the electromagnetic field intelligently, utilizing the informations of mixing and interactions in the plasma flow. The main results obtained here are as follows : (1) The numerical analysis was conducted to clarify the control characteristics of thermofluid flow and plasma parameters in the nonequilibrium RF plasma flow by injecting secondary gas. (2) The numerical analysis was conducted to clarify the control characteristics of particle dispersion and particle heating in the supersonic plasma jet by applying the RF magentic field and by changing particle parameters and nozzle angle. (3) The numerical analysis was conducted to clarify the control characteristics of thermofluid flow and plasma parameter in the mixed nonequilibrium plasma flow in the magnetic duct. (4) The experimental study was conducted to clarify the control characteristics of the nonequilibrium plasma boundary layer along the biased flat plate by applying the magentic field. (5) The experimental study was conducted to clarify the control characteristics of nonequilibrium plasma jet by mixing with other functional gases in the applied magnetic field.
Turbulent Premixed Combustion in a High-Pressure Environment up to 4.0MPa

KOBAYASHI Hideaki, MARUTA Kaoru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

1996 - 1997

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This research was aimed to conduct precise observations of the flame structure, to elucidate the relationship between ambient pressure and turbulence scale and intensities, and to explore the effects of ambient pressure on turbulent burning velocities. Turbulent premixed flames for CH_4-air, C_2H_4-air, and C_3H_8-air mixtures were stabilized by a nozzle burner installed in a high-pressure. The following results were obtained. 1) Measured turbulence characteristics showed that turbulence intensities increatsed with increasing mean velocities. Nevertheless, at ordinary pressure, the increase was small in the region of small mean velocities because of an extensive dumping of turbulence. At high-pressures, turbulence intensity linearly increased with the mean velocities in the entire range of the mean velocities. 2) At high-pressures, flame structure becomes fine and complicated. S_T/S_L increased rapidly with increasing u'/S_L particularly for weak turbulence regions (u'/S_L<l), indicating effects the hydrodynamic instability becomes extensive in a high-pressure environment. For CH_4-air flames, S_T/S_L increases with u'/S_L, up to 30 at 3. OMPa for the experimental conditions achieved. 3) The rate of the increase in S_T/S_L for C_3H_8-air flames was smaller than that for C_2H_4-air flames. This is because the flame area increase due to the hydrodynamic instability at high pressures was restrained by diffusive-thermal effects because the larger Lewis number of C_3H_8-air mixtures. 4) The data for awide range of turbulence intensities showed that the u'/S_L dependence of S_T/S_L for C_2H_4-air flames is almost the same as that for CH_4-air flames. Nevertheless, S_T/S_L for C_3H_8-air flame showed smaller S_T/S_L than in the cases of C_2H_4-air and CH_4-air flames. 5) The applicability of existent correlation between S_T/S_L, u'/S_L, aud turbulence Reynolds number, R_L, to high-pressure flames were examined, and it was found that the data of our experiments had a similar tendency to the correlation by Abde1-Gayd but had larger S_T/S_L than their correlation. 1/4 power law of R_L was seen for S_T/S_L in the strong turbulence region (u'/SL>l.0), consistent with the fractal flamelet model of turbulent burning velocity proposed by Gouldin. 6) The best general correlation which can express the experimental data for a whole range of u'/SL and pressure was in the for of S_T/S_L* [ (P/P_O) (u'/S_<1L>) ]^n and the exponent n was close to 0.4.
Research and Development of Supersonic Combustion Strut with a Preburner

NIIOKA Takashi, ADACHI Shigeru, MARUTA Kaoru, JU Yiguang, KOBAYASHI Hideaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

1995 - 1997

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For the successful development of supersonic propulsion devices the knowledge of ignition and flame stabilization is needed. Since flows within such devices are supersonic, the mixing and reaction times are drastically reduced as compared to the situation within subsonic combustors. A direct implication of the significantly reduced mixing and reaction times is the enhanced sensitivity of the flame stabilization processes in terms of extended ignition delays and the greater propensity of the bulk flame to be extinguished or blown out. This study intends to first, solve the problem of ignition and flame stabilization in low Mach number supersonic airflow by using preburning method. Second, to investigate the combustion mechanism and flame structure of preburned hydrogen in supersonic airflow. Third, to understand the flame stability regime of preburned hydrogen in supersonic airflow. Fourth, to develop a numerical method for computation of supersonic turbulent combustion. Numerical and experimental studies on combustion of preburned hydrogen in supersonic airflow were done. These studies mainly were concerned with ignition, flame stabilization, flame structure and combustion mechanism as well as numerical method for reactive flows. First, the possibility of ignition and flame-holding by preburning method was predicted. It was shown that the temperature limit of auto-ignition is drastically reduced by using the preburning method. In addition, the effect of the preburner equivalence ratio the pressure of the preburner and the supersonic airflow temperature on flame development were studied. It was realized that each of these three parameters had significant effects on flame-holding and combustion development. Futhermore, flame stability limits of preburned hydrogen were predicted by numerical simulation as well as experiment.
超音速空気流における水素燃焼領域の衝撃波干渉による安定化

新岡崇, 丸田薫, じゅ詒光, 小林秀昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 重点領域研究

Institution: 東北大学

1996 - 1996

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年々高負荷化が著しい航空宇宙エンジンにおいて,CO_2フリー燃料としての水素は高速反応の観点からも優れている.本研究は,未来型航空エンジンである,水素を燃料したスクラムジェットエンジンの保炎に関するもので,エンジン内の燃焼領域に衝撃波を入射させることによって保炎性能を向上させることを目的としている. 本年度は,三角柱ストラット保炎器後流の燃焼領域に入射する衝撃波の非対称化,衝撃波入射位置,衝撃波強度,流路閉塞率を変化させ,保炎性能に及ぼす影響を調べた.その結果,以下の知見を得た. 1)衝撃波入射位置がストラット後端に近づくにつれて、再循環流は強化され保炎限界流量は増加することがわかった.逆に,ストラット高さ以上下流へ入射すると保炎限界流量は低下せず、閉塞率の高い場合には逆に上昇する複雑な挙動を示すことがわかった. 2)衝撃波が強いほど再循環流が拡大・強化され、保炎限界流量は増加すること,ストラット後端近傍に入射すると保炎限界流量の増加は大きいが,下流へ入射する場合、衝撃波の強さの違いよる差は少なくなることがわかった. 3)衝撃波非対称入射では,再循環流と噴流は後流内で偏り,保炎限界流量が増加し保炎性能向上に有効であることがわかった. 4)衝撃強度の増大および入射位置の非対称化は,閉塞率を大きくすると,後流幅が減少し保炎限界が低下することが明らかになった.また, 次に,総括反応速度を変化させることを目的として,水素に少量のメタンを添加した場合の保炎実験を行った.その結果,以下の知見を得た. 5)水素流量に対する2%以下のわずかなメタン添加でも保炎限界が大きく狭まり,メタン添加量の増大により,保炎限界全温も上昇することが判明した.これは,メタン分解反応によりHラジカルが消費されるため,メタンの熱分解が完了するまで活性種の増殖が起こらず,着火時間が増大することが原因と考えられる.
Evaporation and Ignition of Liquid Fuels at Critical Pressure Regime.

NIIOKA Takashi, MARUTA Kaoru, JU Yiguang, KOBAYASHI Hideaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

1994 - 1996

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Ignition times of a fuel droplet were measured in a high-pressure high-temperature ambient. Suspended n-heptane, n-octane, n-decane, and n-hexadecane droplets with diameters of 0.35 to 1.4mm were quickly immersed in an electric furnace at temperatures up to 950. Attachment of a droplet, movement of the furnace and measurement of ignition were carried out in an air vessel with pressures from atmospheric pressure to over the critical pressure. Relatively long ignition times of small droplets measured under atmospheric pressure could not be observed at high pressures and the diameter below which a droplet does not ignite became smaller with pressure for every fuel used in this research. Ignition time decreased monotonously with pressure, and even at supercritical pressures, the ignition time behavior did not change much. Being different from the case of combustion, it is suggested that drastic change of properties did not take place in ignition processes. This is basically because the surface temperature of the droplet is much lower for droplet ignition phenomena in comparison with the droplet burning. At the second stage of the research, flame spread phenomena in a suspended fuel droplet array were investigated for n-decane and n-hexadecane in a high-pressure ambience. Seven droplets of the same size were arranged horizontally at equal spacings. Flame spread rates were measured based on OH emission histories detected by a high-speed video camera with an image intensifier for droplet diameters of 0.50,0.75, and 1.0mm at ambient pressure from 0.1 to 2.0MPa. Results showed that, as droplet spacing became smaller, flame spread rate increased and had a maximum value at a certain spacing. A further decrease in droplet spacing caused the spread rate to decrease due to the large latent heat of vaporization. Flame spread rate decreased with pressure and no flame spread was observed at the pressure over the critical pressure. This is due to the rapid decrease in flame diameter with pressure.
超音速空気流における水素燃焼領域の衝撃波干渉による安定化

新岡嵩, じゅ詒光, 丸田薫, 小林秀昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 重点領域研究

Institution: 東北大学

1995 - 1995

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マッハ数2.5、全温550-800Kの超音速空気流に、長さ80mm高さ20mmの二次元楔状ストラットを置き、ストラット背後から水素燃料を噴射した。ストラット後流に衝撃波を入射させると、後流全体に燃焼領域が安定に確保できる。昨年度に引続き、この保炎性能を詳細に調べ、数値シミュレーション結果との比較など進めた。昨年度はLDV計測による流速分布について調べたが、今年度は、ストラット後流の保炎領域について、濃度分布と温度分布、さらにはLIF計測によるOH発光など明らかにした。水素燃料の増大と共に、後流において、再循環流と水素噴流が衝突してできる対向流型の火炎が削減して、超音速流と亜音速再循環流の間のせん断層内の主な燃焼領域が移動するが、濃度分布と温度分布はこれらの現象を立証するデータとなった。また、短時間のOH分布計測は、上記の現象を更に明確にすると共に、再循環流内の化学的に非平衡状態にあるため、ときには全く凍結状態でOHが存在しなかったりお、ときには反応が急速に進行して、OHが十分に存在していることがわかった。流れが必ずしも定常でないため、両方の性状が交互に出てくると考えられる。更にこの保炎メカニズムを確認することと、保炎性能を高めることを目的として、水素燃料に空気を予混合して噴射し、混合を結果として速める実験を行った。予混合化は、むしろ保炎性能を悪くする結果になった。これは、空気の混入によって、噴射の運動量を増大させ、先述のように、火炎を下流に押しやる方向に移動させることになるからである。更に予混合化を進めると、リセス内で一次燃焼することになり、全く異なった保炎形態へ移行する。これらについて詳細に検討を行った。
高圧下における乱流予混合燃焼の促進機構の解明

小林秀昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 東北大学

1994 - 1994

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高圧雰囲気における乱流が,燃焼の促進と抑制に及ぼす影響を解明することを目的として,圧力制御された高圧容器内に乱れ発生板を内蔵した噴流バ-ナを設置し,火炎の可視化計測、乱流計測,フラクタル解析,乱流燃焼速度の測定などを行なった.実験内容と主な知見を以下に示す. 1.高圧雰囲気では,大量の発熱に対する対策に苦慮したが,最終的に30気圧までのメタン-空気乱流予混合炎の安定化,連続燃焼試験に成功した.また,30気圧では高圧容器内に大量の霧状の水が発生し,可視化計測に問題となることが分かった. 2.熱線風速計を用いて,空気流に対して30気圧までの乱流計測を行った結果,同一の乱れ発生板・空気流速における乱れ強さ・乱流スケールは,圧力の増大とともに減少することが明らかとなった.また,乱れのエネルギースペクトルは,高圧になるほど高周波域に占めるエネルギーの割合が大きくなることを示しており,高圧化によって乱流構造が微細化することを意味している. 3.予混合気に二酸化ケイ素微粒子を混入させて火炎を安定化させ,アルゴンイオンレーザのシート光を照射してトモグラフィーをCCDカメラにより撮影した.その結果,圧力の増大とともに,火炎構造は急激に微細化することが判明した. 4.火炎の微細化の様子を定量的に表すため,トモグラフィー像に対してフラクタル解析を行った.その結果,u'/S_1(ここにu'は乱れ強さ,S_1は層流燃焼速度)および圧力の増大とともにフラクタル次元は増大することが判明した.ただし,圧力を更に増大させるとフラクタル次元はほぼ2.3に収束する傾向にあることがわかった. 5.トモグラフィー像から火炎位置を抽出し,多数重ね合わせることによって平均火炎位置を求め,角度法を用いて乱流燃焼速度を算出した.その結果,S_T/S_1(ここにS_Tは乱流燃焼速度)はu'/S_1の増大とともに増大するが,高圧であるほどS_T/S_1の増大は急激であり,圧力(密度)依存は,S_T/S_1〜ρu'/ρ_oS_1(ここにρは密度,添え字0は大気圧)で表されることが明らかとなった.
超音速空気流における水素燃焼領域の衝撃波干渉による安定化

新岡嵩, 丸田薫, 小林秀昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 重点領域研究

Institution: 東北大学

1994 - 1994

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最も反応速度の高い水素燃料は、燃焼速度のみならず、発熱量、断熱火炎温度、定圧比熱、拡散係数、熱伝導率のいずれをとっても大きく、また可燃限界が広く、着火エネルギーも小さい。それにもかかわらず、燃焼領域の安定化は困難であり、種々の特殊な技術を加味しないと、与えられた空気条件に必ずしも安定な火炎が得られるとは限らない。そこで、楔状保炎器の背後に広がる燃焼領域に衝撃波を導入し、その保炎に対する効果を調べるとともに、保炎メカニズムを明らかにすることを目的とした。実験的には、マッハ2.5の全温550-800Kの乾燥した空気流に長さ80mm高さ20mmの二次元楔を置き、衝撃波発生板によって衝撃波を入射した。観察領域の両面をガラスにして光学的観察を行えるように工夫された。発生板の位置や水素燃料の量を変えて燃焼領域の安定範囲を調べ、衝撃波入射位置を後方に移動すると燃焼安定性は悪くなり吹き飛びやすくなることなどわかった。その安定性は、保炎器の背後に再循環領域が大きく発達し、衝撃波入射位置が後方に移動すると、この再循環が急速に弱まることがLDV計測によって解明された。数値計算も同時に行い、再循環領域の動きが確認されると同時に反応率の分布が求められ、水素燃料の量に応じてどのように変動するか明らかにされた。すなわち、保炎器背後からの水素噴流の速度が大きくなると、再循環流の高温空気と衝突してできていた反応帯が消滅して、主流超音速と亜音速領域のせん断層に反応帯先端が移動して種々の条件に対して極めて敏感な燃焼安定性に変わる。また、観察領域内では超音速主流に反応帯ができないことなど分かった。
DEVELOPMENTAL SCIENTIFIC RESEARCH ON CERAMIC CONTROLLABLE-STRUT FOR SUPERSONIC COMBUSTION

NIIOKA Takashi, ADACHI Shigeru, SHIBUYA Kikuo, MITANI Tohru, CHINZEI Nobuo, KOBAYASHI Hideaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Developmental Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1993 - 1994

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A newly devised strut made on an experimental bais was proposed for the ramjet or scramjet engine and its combustion experiments were carried out in supersonic airflow of Mach number 1.5. This strut model is composed of two parts divided streamwise and a part of the strut can be changed, for example, in response to airflow condition. Therefore, it is expected that the flame-holdindg is always possible in any condition of fuel and air. The intervening space between two parts of this controllable strut can be changed up to 60 mm and also the moving speed of the rear strut can be variable. It was found that the flame-holding characteristics were improved, but that they depended on the moving speed beacause of its unstesdiness of the flow. The strut was made of ceramics, whose machinability was so good, and had no problem even after many times of ten-second experiment.
Combustion Phenomena in a Microgravity Environment Competitive

System: Funded Research

1993/04 -
高圧下における乱流予混合燃焼の促進と高負荷化限界に関する研究

小林秀昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 東北大学

1993 - 1993

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燃焼負荷率が極めて大きい高圧雰囲気における乱流予混合火炎につて,乱れによる燃焼の促進と抑制の機構を解明することを目的として,連続燃焼が可能な高圧容器内にバ-ナ火炎を安定化させた.対向乱流火炎の安定化のための第一段階として,対向流バ-ナの片側ノズルを用いブンゼン型バ-ナ火炎として実験を行った.より小型のノズルバ-ナによって層流燃焼実験も行った.混合気としてメタン-空気混合気を用い,大気圧から10気圧まで雰囲気圧力を変化させて実験を行った.実験内容と知見を以下に示す. (1)角度法により求めた層流燃焼速度は従来から知られているように圧力の-2.5乗に比例し,連続燃焼実験装置とバ-ナ火炎による実験法の有用性,妥当性が確認された. (2)乱流燃焼バ-ナにおいて空気流に対する流れの乱流特性を熱線風速計によって測定した結果,平均流速を一定として雰囲気圧力を増大させた場合の乱れのエネルギースペクトルは,高周波成分の低下が鈍くなり,より小さい乱れの持つエネルギーが相対的に大きくなることが確認された. (3)混合気に二酸化珪素微粒子を混入させた乱流火炎にアルゴンイオンレーザのシート光を照射させたトモグラフィー像をCCDカメラにより撮影した.これを画像解析して平均火炎面位置を求め,面積法により乱流燃焼速度と雰囲気圧力との関係を求めた.その結果,乱流燃焼速度は混合気の乱れ強さばかりでなく,雰囲気圧力にも大きく依存することが判明した.その依存性は,従来の乱流レイノルズ数を用いても合理的に整理できず,乱流燃焼に対する雰囲気圧力の影響に関する研究の重要性が確認された. (4)トモグラフィーおよびシュリーレン像を高速度ビデオにより撮影,観察した結果,雰囲気圧力の増大と共に火炎面の変形は鋭く,かつ凹凸のスケールは小さくなり,大気圧火炎とその様相が大きく異なってろくることが明らかとなった.
Combustion Phenomena in a High-Pressure and High-Temperature Environment Competitive

System: Grant-in-Aid for Scientific Research

1992/04 -
乱流予混合燃焼の高負荷化限界に対する火炎の局所ひずみ効果

小林秀昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 東北大学

1992 - 1992
微細空気泡の吹き込みによる液面燃焼の特性改善に関する基礎的研究

北野三千雄, 小林秀昭

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 一般研究(C)

Institution: 東北大学

1992 - 1992

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液体燃料の高効率かつクリーンな燃焼を実現するために不可欠な燃料と空気の混合促進に関し、従来の噴霧方式に替わるものとして、燃料中に微細空気泡を吹き込む方式を提案し、この方式の有効性を試験バーナにより検証した。多孔質板(焼結金属製)を通して、その上にプールされた液体燃料(メタノール及び灯油を使用)中に空気を供給し、これによる発泡を利用して燃料の蒸発と混合を同時に行わせ、その下流域に予混合炎(または拡散炎)を形成させた。この火炎の安定性について、空気流量、燃料温度、燃料のプール深さの影響、及び火炎を下流一定位置に安定させるための保炎板を置いたときの効果、保炎板と気泡層との距離の影響などについて調べた。また、火炎下流で排気分析を行い、CO排出への空気流量の影響を調べた。それにより次のような結果を得た。 1.非燃焼時における燃料の蒸発量は、燃料温度の上昇、空気流量の増大とともに増大するが、当量比で表すと空気流量とともに減少する。このことは、揮発性が高く過濃混合気を形成しやすいメタノールでは火炎の伝播性を強化し、着火を容易にする方向に作用するが、揮発性の弱い灯油では逆に作用する。しかし、燃焼時には蒸発が促進されるため、メタノールでは過濃になりすぎ、予混合炎以外に拡散炎も形成される。 2.予混合炎の安定位置は基本的には混合気速度(燃料蒸発量+空気量)と燃焼速度(混合気の当量比)で決定されるが、気泡層近傍にできる予混合炎では、その位置は両者に影響するため火炎が振動するなど安定させにくい。しかし、これは下流に保炎板を置くことで解決できる。この方法は、気泡層と保炎板との距離を空気流量に応じて調整することで蒸発量、したがって混合気の当量比を制御できるという利点も有する。 3.保炎板上に火炎が安定する範囲では、CO濃度は空気流量に対し漸増傾向を示した。混合気形成の不均質度の増大が原因と考えられる。
Supersonic Combustion Research Competitive

1991/04 -
二成分燃料ー酸素混合気のデトネ-ション波発生と計測に関する研究

新岡嵩, 塚本達郎, 小林秀昭, 三谷徹

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 重点領域研究

Institution: 東北大学

1990 - 1991

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反応性の異なる二成分混合燃料のデトネ-ションに関して、デトネ-ション伝播速度の計測法、混合割合によるその変化、およびデトネ-ション発生限界等を調べている。昨年度考案したフォトダイオ-ドによるデトネ-ション波検出方法によって、伝播速度を比較的容易に求めることができるようになったので、本年は、特に発生のメカニズムを混合燃料の混合割合の変化による伝播速度の変化から調べることを試みた。デトネ-ションは、乱流燃焼から出発するので、スパイラルによって乱流燃焼を助長し、容易に遷移ならしめているが、このスパイラルを出た直後の伝播速度の挙動を詳しく測定した。用いた円管は内径10mm、全長7mである。スパイラルは巻径9mm、ピッチ1.25cmで、スパイラル部は管端から60cmである。プロパン/水素と空気の混合気について、スパイラル部を出たときに定常伝播に達しているものは、その後も一定の伝播速度(1800〜2000m/sec)で伝播しているが、スパイラル部を出るとき、概ね500m/sec以下であればデトネ-ションへは還移しない。その中間の場合が極めて複雑である。一度に1800〜2000m/secのデトネ-ションに達するものもあるが、混合比によって、伝播速度が振動しながらデトネ-ションへ達する。振動を始めたものは必らずデトネ-ション速度に達するか、オ-バ-シュ-ト-する。スパイラル出口直後の挙動の再現性は極めて良いが、距離と共に再現性はくずれる。これらの挙動を基に、混合割合との関係及びそのメカニズムについて分析を進めた。更に、一次元デトネ-ション波速度の計算を進め、実験との比較検討も行った。
二成分燃料ー酸素混合気のデトネ-ション波発生と計測に関する研究

新岡嵩, 塚本達郎, 小林秀昭, 三谷徹, 北野三千雄

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 重点領域研究

Institution: 東北大学

1990 - 1990

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本研究においては、これまで報告された例のない二成分混合燃料系におけるデトネ-ション波発生に関する実験を行い、混合割合によるデトネ-ション速度やデトネ-ション誘導距離の変化を測定することを目的とし、高応答性の半導体技術を利用して、反応帯の発光をフォトダイオ-ドで検知することにより伝播速度を求めることを試みた。 (1)今日まで、フォトダイオ-ドによる伝播計測は因難であったが、真ちゅう製伝播管に直径1mmの穴をあけ、透明ビニル管で真ちゅう管を同心状に外側から覆ってこの小孔をふさぐという簡便な方法をとった。ビニル管外側にフォトダイオ-ドをセットすることによる反応帯の発光の検出は、デトネ-ション波伝播速度の測定に対して十分に有力な方法である。 (2)空気を酸化剤とするとき、デトネ-ションに遷移しにくいメタン、プロパンなどに水素を混合させることによって遷移を起こしやすくすることができる。本実験においては、空気を酸化剤として、水素ーメタン混合燃料で水素45%以上、水素ープロパン混合燃料で水素35%以上の混合割合であればデトネ-ションに遷移する。 (3)水素ーメタン、水素ープロパンの2成分混合燃料のデトネ-ション速度は、水素割合の大きい範囲においては水素の混合割合の減少と共にほぼ直線的に減少する。 (4)上記混合燃料の当量比によるデトネ-ション伝播速度の変化は、概ね純粋な水素の変化に類似しており、大部分の反応速度が水素によって支配されていることがうかがえる。
Study of Flame Interference of Counterflow Twin Flames

KITANO Michio, KOBAYASHI Hideaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for General Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1985 - 1986

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Concerning the twin flames obtained with a counterflow nozzle burner, the nozzle velocity dependencies of flame temperature, concentration profile, burning velocity, and flame-to-flame distance were investigated for propane/ air mixture, and flame interference effects caused by the existence of two adjacent flames were examined. Furthermore, theoretical analysis was also made on the flammability limits of the twin flames. The obtained results are as follows: 1. Some singularities implying the flame strengthening due to flame interference were noticed in the relations of flame temperature and flame distance to the nozzle velocity in a certain velocity range. 2. Gas analysis made for the two flames just before and under interference gave no significant differences in the concentration profiles of stable species, which suggests that the active chemical species might play an important role in the flame interference. 3. The flammability limits of the twin flames and the one-dimensional-flow flame which is not subjected to interference effects were theoretically compared by the analysis based on a reaction model in which the importance of active species was taken into account, and the limits of the twin flames were found to be more widened owing to the interference. 4. The addition effects of hydrogen, well known as an active fuel, to propane was investigated. Though the effect was not so simple, the velocity range of interference was widened (i.e., the interference effect was strengthened ) in the lean side. 5. Singularities were noticed also in the relation between the nozzle velocity and the burning velocity obtained by velocity measurements with LDV. However, if the burning velocity is plotted against the velocity gradient normal to the flame surface, the relation becomes monotonous, indicating that the nozzle velocity cannot be regarded as a linear parameter for the flame stretch.

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代表的バイオ燃料であるエタノールの反応機構を簡略化し多次元数値解析への適用を行うと共に、計算の高速化を図る、
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高温空気燃焼の基盤技術に関する研究

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予混合火炎の固有不安定性と非線形挙動

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予混合火炎の固有不安定性による非線形挙動を大規模数値解析により明らかにする
高圧下の変動速度場における液滴燃焼実験

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微小重力下および通常重力下における石炭粒子からの微量元素放出速度の解析

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微小重力下および重力下における石炭チャーガス化速度の解析

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微小重力場を利用した超臨界圧域の燃料液滴列燃え拡がり機構の研究

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