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Yuka Iga

Section

Institute of Fluid Science

Job title

Professor

Degree

博士（工学）（東北大学）
修士（工学）（東北大学）

researchmap

https://researchmap.jp/yuka_iga

J-GLOBAL ID

200901085559737260

Research History 6

2019/10 - Present

Japan Aerospace Exploration Agency　Office of Space Flight and Operations Kakuda Space Center
2018/01 - Present

Tohoku University　Institute of Fluid Science　Professor
2012/05 - 2017/01

Tohoku Univeristy　Institute of Fluid Science　Associate Professor
2004/04 - 2012/04

東北大学流体科学研究所　助手
2003/04 - 2004/03

東北大学流体科学研究所　教務補佐員
2003/04 - 2004/03

宇宙航空研究開発機構（JAXA）　非常勤職員

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Education 2

Tohoku University　Graduate School, Division of Engineering　航空宇宙工学

- 2003/03/24
Tohoku University　Faculty of Engineering　機械知能工学科

- 1998/03/24

Committee Memberships 60

Jiangsu University Research Center of Fluid Machinery Engineering and Technology(China)　guest professor

2023/10 - Present
日本混相流学会　副会長(企画担当)

2023/08 - Present
日本機械学会　2024年計算力学講演会実行委員会幹事

2023/04 - Present
ターボ機械協会　特別理事

2022/05 - Present
日本機械学会　経営企画委員会委員

2022/04 - Present
日本機械学会　フェロー

2022/04 - Present
ターボ機械協会　国際ジャーナル委員会委員(専門領域：キャビテーション，CFD，インデューサ)

2019/08 - Present
東北大学　安全輸出管理委員

2018/04 - Present
日本混相流学会　評議員

2018/04 - Present
東北大学　沢柳フェロー(女性リーダー育成)

2018 - Present
東北大学　研究倫理推進委員会委員

2017 - Present
日本機械学会　男女共同参画委員会(LAJ委員会)委員

2016/04 - Present
ターボ機械協会　HPC実用化研究分科会委員

2016/04 - Present
ターボ機械協会プロペラ研究分科会　委員

2014/04 - Present
ターボ機械協会　キャビテーション研究分科会委員

2012/04 - Present
ターボ機械協会　ターボポンプ研究分科会委員

2012/04 - Present
流体科学研究所　ハラスメント相談員

2004/04 - Present
流体科学研究所　ハラスメント委員会委員

2004/04 - Present
日本流体力学会　理事

2016/04 - 2024/02
日本混相流学会　総務委員長

2021/08 - 2022/08
日本混相流学会　理事(総務部会長)

2021/08 - 2022/08
日本混相流学会　論文審査委員

2017/08 - 2022/08
ターボ機械協会　編集理事

2017/04 - 2022/05
ターボ機械協会　代議員

2013/04 - 2022/05
日本機械学会　広報情報部会部会長

2021/04 - 2022/03
日本機械学会　流体工学部門技術委員会幹事

2020/04 - 2022/03
日本機械学会　緊急タスクフォース委員（新型コロナウィルス感染性拡大防止対応）

2020/04 - 2022/03
日本機械学会流体工学部門　流れの先進的計測・シミュレーション法と流体情報の高度利用に関する研究分科会研究者委員

2020/04 - 2022/03
日本機械学会　代表会員

2020/04 - 2022/03
日本機械学会　理事

2020/04 - 2022/03
自動車技術会　流体技術委員会委員

2015/04 - 2022/03
日本流体力学会　代議員

2015/04 - 2022/03
自動車技術会流体技術委員会　委員

2015/04 - 2022/03
日本混相流学会　混相流シンポジウム実行委員

2020/08 - 2021/08
日本混相流学会　総務委員

2020/08 - 2021/08
日本混相流学会　ダイバーシティ推進委員会委員長

2019/04 - 2021/08
流体科学研究所　VISION2030 改定WGメンバー

2020/12 - 2021/03
日本機械学会　2020年度会員部会委員

2020/06 - 2021/03
日本機械学会　2020年度年次大会企画WG 委員

2020/06 - 2021/03
日本機械学会　技術委員会幹事

2020/04 - 2021/03
日本機械学会流体工学部門　運営委員会委員

2019/04 - 2021/03
日本混相流学会　理事(東北地区担当)

2018/04 - 2020/08
日本機械学会　男女共同参画委員会（LAJ委員会）副委員長

2019/04 - 2020/03
日本機械学会　流体工学部門総務委員

2019/04 - 2020/03
日本機械学会　流体工学部門講演会WG主査

2019/04 - 2020/03
日本機械学会　東北支部商議員

2019/04 - 2020/03
日本機械学会　東北支部代表会員

2019/04 - 2020/03
日本機械学会産業・化学機械と安全部門　代議員

2016/04 - 2018/03
日本流体力学会　男女共同参画委員会委員

2015/04 - 2018/03
日本流体力学会男女共同参画委員会　委員

2015/04 - 2018/03
日本機械学会　流体工学部門講演会WG幹事

2018/04 - 2018
ターボ機械協会　ターボ機械IAHR実行委員会

2016/04 - 2018
日本流体力学会　国際連携委員会委員長

2016/04 - 2017
日本機械学会　産業・化学機械と安全部門代議員

2016/04 - 2017
流体科学研究所　VISION2030 WGメンバー

2015/04 - 2015
東北大学　工明会理事

2014 - 2014
東北大学　男女共同参画委員会委員

2013 - 2013
流体科学研究所　安全衛生委員会委員

2008/04 - 2013
ターボ機械協会　コンソーシアムプロジェクト委員

2008/04 - 2011
流体科学研究所　男女共同参画委員会委員

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Professional Memberships 7

THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
SOCIETY OF AUTOMOTIVE ENGINEERS OF JAPAN
THE JAPAN SOCIETY OF FLUID MECHANICS
THE JAPANESE SOCIETY FOR MULTIPHASE FLOW
THE HEAT TRANSFER SOCIETY OF JAPAN
ターボ機械協会
日本機械学会

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Research Interests 6

旋回キャビテーション
サージ
ターボ機械
均質媒体モデル
数値解析
キャビテーション

Research Areas 1

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Fluid engineering /

Awards 5

AJKFED2023優秀講演表彰

2023/09　Unsteady Characteristicsc of Tip Leakage Vortex Cavitation in the Occurrence of Cavitaion Instability in Inducer
日本機械学会賞（論文）

2019/04　日本機械学会　温水キャビテーションにおける熱力学的効果の発現に関する実験的研究
公益社団法人自動車技術会 2017年度大学院研究奨励賞

2018/03　公益社団法人自動車技術会　流れ場の力学的刺激による溶存気体の析出を考慮した油中キャビテーションの数値解析モデルの開発
ターボ機械協会第76回北見講演会若手優秀講演賞

2016/09　一般社団法人ターボ機械協会　高速液滴衝突における流体・材料連成数値解析
日本機会学会奨励賞（研究）

2006/04　日本機械学会　実事象再現化を重視した数値解析モデルによるキャビテーション不安定現象の解明とその抑制の研究

Papers 292

Enhancement of the Thermodynamic Suppression Effect of Cavitation in a Hydrofoil with a Slit

Yuka Iga, Takeru Katagiri, Junnosuke Okajima

Journal of Fluids Engineering　1-25　2025/03/21
Publisher: ASME International
DOI： 10.1115/1.4068248 　

ISSN： 0098-2202

eISSN： 1528-901X

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Abstract The occurrence and growth of cavitation are suppressed in cryogenic fluids used as propellants for liquid rockets, and this phenomenon is called the thermodynamic suppression effect of cavitation. This effect is attributed to the temperature drop around the cavity caused by the latent heat of evaporation. Further, a method to suppress oscillation phenomena called cavitation instabilities by cutting off a part of the inducer blade (referred to as a slit inducer) has been proposed by the authors. Although the suitability effect was confirmed for suppressing the cavitation oscillation, there is a need to demonstrate that the slit does not inhibit the thermodynamic suppression effect of cavitation even when it is installed in the inducer of the liquid rocket turbopump. In this study, the thermodynamic suppression effect of cavitation is examined in an experiment with a NACA0009 hydrofoil with and without a slit in a hot-water cavitation tunnel as a preliminary step in the investigation of a slit inducer. The temperature drops and the distribution inside the cavity were measured by our direct temperature measurement method with unsteady temperature estimation method under T∞ = 90 °C to investigate the small difference in the thermodynamic suppression effect that does not appear in the cavity length. The expanded uncertainty of the temperature probe using thermistor is 17 mK. As the results, it was found that the cavity suppression amount in the region downstream of the slit inside the cavity increased under the condition of unsteady cavitation in the hydrofoil with a slit.
Transition from attached cavitation to nucleate boiling on heated NACA0015 hydrofoil Peer-reviewed

Ning Yang, Junnosuke Okajima, Yuka Iga

12th International Cavitation Symposium (CAV2024)　2024/06
Experimental Study of Turbulent Thermodynamic Parameter by Internal Temperature Measurement in Hot Water Cavitation Peer-reviewed

Shuichi. Ichiki, Junnosuke Okajima, Yuka Iga

12th International Cavitation Symposium (CAV2024)　2024/06
Oscillation Characteristics of Tip Leakage Vortex Cavitation Arising in a Twisted Hydrofoil with Tip Clearance Peer-reviewed

Koki Tamura, Yuka Iga

12th International Cavitation Symposium (CAV2024)　2024/06
Experimental Study of the Cavitating Flow on an Independently Heated Venturi Nozzle Peer-reviewed

Ning Yang, Junnosuke Okajima, Yuka Iga

Journal of Fluids Engineering　146　(11)　2024/05/28
Publisher: ASME International
DOI： 10.1115/1.4065505 　

ISSN： 0098-2202

eISSN： 1528-901X

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Abstract Despite the observation of change in the cavitation regime on a heated surface, the specific section of the wall surface that plays a more dominant role in this transition phenomenon remains unknown. This study experimentally investigated the effect of surface temperature of different regions on the cavitating flow in terms of the cavitation regime. The experiments were conducted using a convergent–divergent Venturi nozzle comprising two parts that could be heated independently. The Venturi nozzle could be fully or selectively heated at either the front, where the leading edge of the cavity sheet was located, or the rear, where the cavity sheet developed. The cavitation behavior under different heating conditions was investigated using high-speed visualization and fluctuating pressure measurements. Compared with the nonheated case, which exhibited sheet-cloud cavitation, the cavitation regime on the fully heated Venturi nozzle exhibited transient cavitation. The same transition phenomenon was also observed when only the front part of the Venturi nozzle was heated. In contrast, heating the rear part alone did not induce a change in the cavitation regime. Therefore, it appeared that the transition of the cavitation regime on a heated surface was mainly influenced by the temperature increase at the leading edge of the cavity sheet.
Fluid/Material Coupled Numerical Simulation of a Bubble Collapse Near a Wall for Laser Cavitation Peening

Yuka Iga, Chieko Kuji, Hirotoshi Sasaki, Hitoshi Soyama

Lecture Notes in Mechanical Engineering　309-314　2024/05/07
Publisher: Springer Nature Singapore
DOI： 10.1007/978-981-99-8643-9_37 　

ISSN： 2195-4356

eISSN： 2195-4364
インデューサに発生する旋回キャビテーションの現象解明に向けた多点圧力計測

池田和樹, 奈倉悠人, 川崎聡, 伊賀由佳

第90回ターボ機械協会総会講演会　2024/05
Observation of Superposition of Cavitation Instability in Liquid Rocket Inducer by Multi-point Pressure Measurement Peer-reviewed

Sota Harada, Yuto Nakura, Koki Tamura, Satoshi Kawasaki, Yuka Iga

The 8th International conference on Pumps and Fans (ICPF2024)　2024/04
Numerical Analysis of Oscillation Characteristic of Cavitation in Liquid Rocket Inducer with Several Suppression Methods Peer-reviewed

Takuo Mino, Koki Tamura, Satoshi Kawasaki, Yuka Iga

The 8th International conference on Pumps and Fans (ICPF2024)　2024/04
An innovative method of pressure measurement inside a laser-induced cavitation bubble Peer-reviewed

Satoshi Uehara, Takehiko Sato, Sayaka Kamata, Seiji Kanazawa, Yuka Iga, Tomoki Nakajima, Mohamed Farhat

Physics of Fluids　36　(4)　2024/04/01
Publisher: AIP Publishing
DOI： 10.1063/5.0206640 　

ISSN： 1070-6631

eISSN： 1089-7666

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This study proposes a novel method for measuring the pressure inside a laser-induced cavitation bubble during its expansion. Based on Paschen's theory, which relates electrical breakdown to gas pressure, applied voltage, and electrode distance, our approach uses two electrodes to estimate the cavitation bubble pressure at different expansion stages by noting the breakdown time at varying voltages. This method offers a high temporal resolution owing to its rapid electrical discharge response. The unveiled pressure during the expansion phase was approximately 0.4 atm. This value contradicts previous reports that assumed that the minimum pressure was close to the water vapor pressure.
Temperature depression model for cavitating flow with thermodynamic suppression effect in high-temperature water Peer-reviewed

Junnosuke Okajima, Taku Hanyuda, Yuka Iga

International Communications in Heat and Mass Transfer　151　107229-107229　2024/02
Publisher: Elsevier BV
DOI： 10.1016/j.icheatmasstransfer.2023.107229 　

ISSN： 0735-1933
New type of cavitation instability with peculiar frequency characteristic in liquid rocket inducer Peer-reviewed

Koki Tamura, Satoshi Kawasaki, Yuka Iga

Journal of Physics: Conference Series　2707　(1)　012041-012041　2024/02/01
Publisher: IOP Publishing
DOI： 10.1088/1742-6596/2707/1/012041 　

ISSN： 1742-6588

eISSN： 1742-6596

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Abstract In a liquid rocket turbopump with low pressure and thin wall tanks, cavitation inevitably occurs at the inducer which is installed at the inlet of the turbopump. The cavities at each blade oscillate periodically, and the turbopump sometimes becomes unstable, called cavitation instability. Rotating cavitation is one of the common types of cavitation instability, in which the cavities at each inducer blade oscillate respectively and appear to propagate from blade to blade. However, the new type of cavitation instability which does not follow the conventional principle has been observed in our experiment with an inducer. Converting the frequency in the inertial frame to that in the rotational frame and organizing it in the cavitation number, it was found that the frequency of unsteady cavitation increases as the cavitation number decreases, and this is the peculiar point of this instability. Additionally, during the cavitation instability, a few numbers of backflow vortex cavities were observed and moved sub-synchronously from blade to blade. In addition, the tip leakage vortex cavitation on each blade also propagates like sub-synchronous rotating cavitation but in different propagation speed from that of the backflow vortex cavities. As a result, it was supposed that the new instability is one of the types of sub-synchronous rotating cavitation related to backflow vortex cavitation, tip leakage vortex cavitation, and interaction between cavity propagation and inducer blade.
熱力学的自己抑制効果評価のための非定常キャビテーション温度推定手法

岡島淳之介, 江口暢, 伊賀由佳

キャビテーションに関するシンポジウム(第21回)　2023/12
高温水キャビテーションの内部温度計測による乱流熱力学的パラメータの実験的検証

市来秀一, 岡島淳之介, 伊賀由佳

キャビテーションに関するシンポジウム(第21回)　2023/12
The Effects of a Slit in a Hydrofoil on the Thermodynamic Self-Suppression Effect for Tip Leakage Vortex Cavitation

Yuto Oda, Junnosuke Okajima, Yuka Iga

20th International Conference on Flow Dynamics (ICFD2023)　2023/11
Effect of the difference in slit locations on the suppression of cavitation instabilities in an inducer Peer-reviewed

Naruki Ishikawa, Yuto Nakura, Satoshi Kawasaki, Mitsuru Shimagaki, Yuka Iga

AICFM17,Zhenjiang, China　2023/10
液体ロケットインデューサの不安定抑制手法がキャビテーション動特性に与える影響

美濃拓生, 田村浩紀, 川崎聡, 伊賀由佳

ターボ機械協会第89回創立50周年記念学術講演会　2023/09/21
不安定現象発生時の液体ロケットインデューサの各翼におけるキャビテーション振動特性の解析

奈倉悠人, 田村浩紀, 川崎聡, 伊賀由佳

ターボ機械協会第89回創立50周年記念学術講演会　2023/09/21
Thermodynamic cavitation suppression on the laminar vortex flow over a circular cylinder in water Peer-reviewed

Anh Dinh Le, Viet-Anh Truong, Yuka Iga

International Journal of Heat and Mass Transfer　211　124210-124210　2023/09
Publisher: Elsevier BV
DOI： 10.1016/j.ijheatmasstransfer.2023.124210 　

ISSN： 0017-9310
翼端隙間を有する単独翼に発生する翼端漏れ渦キャビテーションの非定常特性に関する実験的研究

田村浩紀, 伊賀由佳

混相流シンポジウム2023　2023/08
Investigation of bimodal characteristics of the droplet size distribution in condensation spray Peer-reviewed

Junnosuke Okajima, Mitsuki Kato, Akihiro Hayakawa, Yuka Iga

Scientific Reports　13　(1)　2023/07/25
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-023-39087-5 　

eISSN： 2045-2322

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Abstract To understand the generation process of airborne droplets during exhalation, this study investigates the mechanism of bimodal characteristics of the size distribution of droplets generated in a condensed spray flow. The phase change process in the condensed spray flow was estimated based on the droplet size distribution measured by a phase Doppler particle analyzer and the temperature distribution measured by a thermistor. On the central axis, the size distribution was unimodal in the spray interior. In contrast, bimodality of the size distribution at the outer edge of the spray flow was observed. At the edge of the spray flow, a large temperature gradient was formed. This indicates that condensation actively occurred at the outer edge. For the same reason as outlined above, condensation did not progress at the spray center because of the consumption of water vapor at the outer edge by the condensation, and the droplet diameter did not change significantly. Hence, owing to the difference in the local phase change process between the center and outer edge of the spray, large and small droplets can exist simultaneously in the middle region. As a result, the size distribution of the condensation spray is bimodal.
The Similarity Law of Cavitation Number on Cavitation Instability in Liquid Rocket Inducer Peer-reviewed

Koki Tamura, Sota Kondo, Satoshi Kawasaki, Yuka Iga

Journal of Fluids Engineering　145　(11)　2023/07/17
Publisher: ASME International
DOI： 10.1115/1.4062895 　

ISSN： 0098-2202

eISSN： 1528-901X

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Abstract The influence of inducer rotation speed on the propagation characteristics of rotating cavitation and on the unsteady characteristics of cavitation in rotating cavitation and cavitation surge were examined using a three-bladed inducer, which is named THK inducer, to develop the rocket engine turbopump that can operate stably over a wide operating range. The novel point of the paper is focusing on the cavitation itself, which is the cause of cavitation instabilities. The paper conducted two types of experiments using an inducer and single hydrofoils, and the dimensional and nondimensional unsteady characteristic, which is the frequency of unsteady cavitation and the Strouhal number, were evaluated. Three types of rotating cavitation and cavitation surge were observed in the inducer. For a given cavitation number, the Strouhal number of rotating cavitation and the frequency of unsteady cavitation in cavitation surge are independent of the inducer rotation speed, respectively. The characteristic of rotating cavitation corresponds to that of cavitations arising in hydrofoils, but its characteristic of cavitation surge does not correspond. The dynamic characteristic of cavitation compliance in cavitation surge is similar to that of several rocket engine turbopumps. Therefore, it was proved that rotating cavitation is a cavity oscillation and cavitation surge is a system oscillation. Additionally, in a flow field with the same flow coefficient and different impeller rotation speed, the unsteady characteristics of cavitation instabilities are equal if the cavitation number is equal, which is named the “similarity law of cavitation number on cavitation instability.”
Estimation of Temperature in Unsteady Cavitating Flow around Triangular Obaject

Itaru Eguchi, Takashi Ohira, Junnnosuke Okajima, Yuka Iga

AJKFED2023, Osaka, Japan　2023/07
Investigating the Mechanism of Scale Effect of Cavitation Inception in Water

Aye Sandar Kyaw, Yuka Iga

AJKFED2023, Osaka, Japan　2023/07
Unsteady Characteristics of Tip Leakage Vortex Cavitation in the Occurrence of Cavitation Instability in Inducer

Koki Tamura, Yuto Nakura, Satoshi Kawasaki, Yuka Iga

AJKFED2023, Osaka, Japan　2023/07
An experimental study on thermodynamic self-suppression effect of cavitation in a single hydrofoil with slit

Takeru Katagiri, Junnosuke Okajima, Yuka Iga

AJKFED2023, Osaka, Japan　2023/07
Laser Cavitation Peening: A Review Peer-reviewed

Hitoshi Soyama, Yuka Iga

Applied Sciences　13　(11)　6702-6702　2023/05/31
Publisher: MDPI AG
DOI： 10.3390/app13116702 　

eISSN： 2076-3417

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During submerged laser peening using a pulsed laser, a bubble that behaves like cavitation is generated after laser ablation (LA). The bubble is referred to as laser cavitation (LC). The amplitude of the shockwave in water generated by LA is larger than that of LC; however, the impact passing through the target metal during LC is larger than that of LA. LC impact can be utilized for peening at optimized conditions. Thus, submerged laser peening is referred to as “laser cavitation peening”, as the peening method using the cavitation impact is known as “cavitation peening”. The impact induced by a hemispherical bubble is more aggressive than that of a spherical bubble with a microjet. Laser cavitation peening can improve the fatigue strength of metallic materials by producing work-hardening and introducing compressive residual stress. Three-dimensional additively manufactured metals (3D metals) such as titanium alloy are attractive materials for aviation components and medical implants; however, the fatigue strength of as-built components is nearly half of that of bulk metals, and this is an obstacle for the applications of 3D metals. In the present study, published research papers are reviewed to identify the key factors of laser cavitation peening, with additional visualization of LC and data. Then, improvements in the fatigue strength of metallic materials, including 3D metals treated by laser cavitation peening, are summarized.
遠心ポンプに発生する旋回キャビテーションの騒音測定

伊賀由佳, 横井貴志, 守谷修一, 能見基彦

ターボ機械協会第88回総会講演会　2023/05
Change in Cavitation Regime on NACA0015 Hydrofoil by Heating the Hydrofoil Surface Peer-reviewed

Ning Yang, Junnosuke Okajima, Yuka Iga

Journal of Fluids Engineering　145　(7)　071201-1-071201-11　2023/03/13
Publisher: ASME International
DOI： 10.1115/1.4057004 　

ISSN： 0098-2202

eISSN： 1528-901X

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Abstract An experimental study of cavitating flow on a heated NACA0015 hydrofoil was conducted in a cavitation tunnel to investigate the influence of the hydrofoil surface temperature on the cavitating flow. The cavitation behavior under different heating conditions was examined using high-speed video, and an image processing method was used to obtain the periodic characteristics of the cavitating flow. The results revealed that attached sheet cavitation and supercavitation occurred on both heated and unheated hydrofoils. However, sheet-cloud cavitation was observed only on the unheated hydrofoil, whereas transient cavitation was observed only on the heated hydrofoil. Transient cavitation also exhibited periodic growth/collapse behavior; however, there was no shedding of a large vapor cloud. Moreover, with a further increase in the hydrofoil surface temperature, transient cavitation turned into open-type cavitation. The cavitating flow exhibited a quasi-steady cavity length with an open cavity closure. It was considered that the surface temperature promoted vapor generation at the cavity leading edge, which enlarged the vapor-filled fore part of the sheet cavity. This enlarged sheet cavity prevented the reentrant flow from moving upstream and thus turned the cavity closure into an open type. Once the cavity closure turned into an open type, the local disturbance led to a smaller adverse pressure gradient, which was not sufficiently strong to create a reentrant flow. In this case, if the vapor generation at the cavity leading edge was sufficiently large to reach a balance with vapor condensation at the open cavity closure, the cavity would be steady.
Relationship between a non-spherical collapse of a bubble and a stress state inside a wall Peer-reviewed

Yuka Iga, Hirotoshi Sasaki

Physics of Fluids　35　(2)　023312-023312　2023/02/08
Publisher: AIP Publishing
DOI： 10.1063/5.0136355 　

ISSN： 1070-6631

eISSN： 1089-7666

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This study performed a fluid/material coupled numerical simulation of the first stage of a non-spherical collapse of a bubble near a wall and investigated the stress state inside the elastic material of the wall according to the change in the stand-off distance γ between the bubble and the wall. The relationship between the collapse behavior of the bubble and propagation of stress waves was confirmed for typical collapse modes: pancake-shaped mode at γ = −0.3, hemispherical mode at γ = 0, microjet mode at 0.3 < γ < 1.0, and detaching mode at γ > 1.2. The stress influence area, which is an index of material damage, was estimated. At 0.3 < γ < 1.0, the stress influence area caused by the microjet is narrow and shallow in the material; in contrast, that caused by the pressure waves spreads more widely and deeply, especially inside the material. This means that the pressure wave has a larger influence than the microjet on damage to a material even though the maximum value of the equivalent stress is nearly identical between the microjet and the pressure wave. Additionally, the depth of the stress influence area at 0.3 < γ < 0.5 is larger than that at γ = 0, although the volume and the maximum stress are larger at γ = 0 than at 0.3 < γ < 0.5. This indicates that the case of toroidal bubble rebound attaching to a wall has the potential to cause a deeper damage inside a material in comparison with hemispherical bubble collapse.
Thermodynamic Suppression Effect of Cavitation Arising in a Hydrofoil in 140 °C Hot Water Peer-reviewed

Yuka Iga, Junnosuke Okajima, Yuki Yamagichi, Hirotoshi Sasaki, Yu Ito

Journal of Fluids Engineering　145　(1)　011207-1-011207-9　2022/10/17
Publisher: ASME International
DOI： 10.1115/1.4055600 　

ISSN： 0098-2202

eISSN： 1528-901X
Experimental study of cavitating flow influenced by heat transfer from heated hydrofoil Peer-reviewed

Junnosuke Okajima, Masaki Ito, Yuka Iga

International Journal of Multiphase Flow　155　104168-104168　2022/10
Publisher: Elsevier BV
DOI： 10.1016/j.ijmultiphaseflow.2022.104168 　

ISSN： 0301-9322
Occurrence characteristics of gaseous cavitation in oil shear flow Peer-reviewed

Yuka IGA, Junnosuke OKAJIMA, Shunpei TAKAHASHI, Yousuke IBATA

Physics of Fluids　34　(2)　023313-023313　2022/02
Publisher: AIP Publishing
DOI： 10.1063/5.0075659 　

ISSN： 1070-6631

eISSN： 1089-7666
Estimation of temperature inside unsteady cavitation in high-temperature water Peer-reviewed

Yuma OKUBO, Junnosuke OKAJIMA, Yuka IGA

Journal of Fluid Science and Technology　17　(3)　JFST0008-JFST0008　2022
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jfst.2022jfst0008 　

eISSN： 1880-5558
Guest Editorial

Kazuyoshi Miyagawa, Arthur Favrel, Yuka Iga, Masaharu Uchiumi

Journal of Fluids Engineering, Transactions of the ASME　143　(12)　2021/12

ISSN： 0098-2202

eISSN： 1528-901X
NACA16-012翼形に発生するキャビテーション消滅現象と境界層の関係

菅谷航己, 岡島淳之介, 伊賀由佳

日本機械学会第99期流体工学部門講演会　2021/11
Numerical analysis of effect of slit shape on the performance and cavitation instability of liquid rocket inducer Peer-reviewed

Asuka Kowata, Satoshi Kawasaki, Yuka Iga

3rd IAHR-Asia Symposium on Hydraulic Machinery and Systems, Web (2021.11), CT006.　2021/11
Suggestion of Modified Thermodynamic Parameter through Numerical Analysis of Cavitation in Hydrogen and Nitrogen using Simplified Thermodynamic Model Peer-reviewed

49　(11)　50-57　2021/11
液体ロケットインデューサのスリット形状が性能及び不安定現象に及ぼす影響の数値解析

木幡明日花, 金丸萌菜, 川崎聡, 伊賀由佳

日本航空宇宙学会北部支部2021年講演会ならびに第2回再使用型宇宙輸送系シンポジウム　2021/03
国内のキャビテーションタンネル実験設備の紹介

伊賀由佳

タ－ボ機械　49　(2)　39-55　2021/02
気体性キャビテーションモデルを用いたトルクコンバータ内部のキャビテーション予測手法 Peer-reviewed

薄井友彦, 伊賀由佳

自動車技術会論文集　52　(5)　961-966　2021
Experimental study on thermodynamic suppression effect by temperature measurement inside cavitation in high temperature water Peer-reviewed

Taku HANYUDA, Junnosuke OKAJIMA, Yuka IGA

Transactions of the JSME (in Japanese)　87　(899)　21-00102-00102　2021
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/transjsme.21-00102 　

eISSN： 2187-9761
Numerical analysis of fluid-material coupled method on propagation of pressure and stress waves during non-spherical bubble collapse

SASAKI Hirotoshi, ENDO Susumu, IGA Yuka

Transactions of the JSME (in Japanese)　2021
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/transjsme.20-00259 　

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When analyzing cavitation erosion, it is necessary to grasp the stress state inside a material due to the bubble collapse process. In this study, the behavior of a vapor bubble collapse and the stress distribution inside the material due to the bubble collapse were analyzed by using an in-house fluid/material coupled numerical method. In order to evaluate the stress inside the material, the "stress influence area" is introduced and used for the evaluation of the amount of input stress to the material. For analysis results, the two times of impulsive pressure occur in a first collapse, which is caused by two kinds of mechanism, one is a micro-jet, and the other is pressure waves of rebound of the toroidal bubble. Even though the impulsive pressure on a material surface by the micro-jet is smaller than the pressure waves of rebound, the maximum equivalent stress which is installed inside the material is nearly the same value. Further, even though the maximum equivalent stress generated in the material is almost the same, the "stress influence area" is overwhelmingly large in the case of the pressure waves of the rebound as compared to the micro-jet. Therefore, it indicates that the stress state inside the material cannot be predicted just by the measurement of impulsive pressure on the material surface.
Influence of Rotational Speed of an Inducer on the Propagation Velocity of Super-synchronous Rotating Cavitation Peer-reviewed

Sota Kondo, Moena Kanamaru, Satoshi Kawasaki, Yuka Iga

Proc. 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC18)　(No. 2019-00100)　2020/11
Experimental Study of Break-off Frequency in Cavitation Disappearance Phenomenon on NACA16-012 Hydrofoil Peer-reviewed

Koki Sugaya, Takaho Ochiai, Junnosuke Okajima, Yuka Iga

Proc. 18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC18)　(No. 2019-00142.)　2020/11
Numerical study of slit position for suppression effect on cavitation instabilities in inducers

Moena Kanamaru, Asuka Kowata, Satoshi Kawasaki, Yuka Iga

Proc. 17th International Conference on Flow Dynamics (ICFD2020)　(OS18-15)　2020/10
Active and Passive Control of Unsteady Cavitation on a Hydrofoil

Takaho Ochiai, Ebrahim Kadivar, Koki Sugaya, Junnosuke Okajima, Yuka Iga

Proc. 17th International Conference on Flow Dynamics (ICFD2020)　(OS19-CRF67)　2020/10
Science of Ultrafine Drop and High Speed Impact

T. Sato, M. Watanabe, T. Yano, Y. Iga, K. Kobayashi, T. Hayase, J. Ishimoto, M. Ohta, A. Komiya, H. Takana, K. Ohtani, J. Okajima, S. Uehara, S. Miyauchi, H. Anzai

Proc. The 20th International Symposium on Advanced Fluid Information (AFI2020)　(No. CRF-17)　2020/10
Improvement of Pressure Measurement Method in a Laser-Induced Cavitation Bubble

Satoshi Uehara, Sayaka Kamata, Tomoki Nakajima, Yuka Iga, Seiji Kanazawa, Takehiko Sato

Proc. The 20th International Symposium on Advanced Fluid Information (AFI2020)　2020/10
Validation of Gaseous Cavitation Model for a Cascade in Oil Peer-reviewed

48　(10)　40-48　2020/10
Prediction of Fluid Exciting Force due to Cavitation

宮川和芳, 伊賀由佳, 堀口祐憲, 川北千春

ターボ機械　48　(9)　33-44　2020/09

ISSN： 0385-8839
加熱された翼形からの伝熱がキャビテーション流れへ及ぼす影響

岡島淳之介, 伊藤成紀, 伊賀由佳

ターボ機械協会第83回総会講演会　(No.B11)　2020/05
スリットインデューサによる低流量条件下での揚程安定化に関する研究

金丸萌菜, 川崎聡, 伊賀由佳

ターボ機械協会第83回総会講演会　(No.B07)　2020/05
Numerical Study on Progression Mechanism of Liquid Droplet Impingement Erosion Peer-reviewed

SASAKI Hirotoshi, FURUYA Osamu, IGA Yuka

Turbomachinery　48　(1)　47-52　2020
Publisher: Turbomachinery Society of Japan
DOI： 10.11458/tsj.48.1_47 　

ISSN： 0385-8839

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Liquid droplet impingement erosion (LDI) occurs in fluid machinery on which many droplets impinge at high speed. In the process of LDI erosion, the material surface becomes completely roughened by erosion pits and these pits get locally deeper and deeper even though the droplets uniformly impinge on the material surface. In this study, to clarify the mechanism of erosion progressing in the form of locally deep depression, the numerical analysis of droplet impingement on the deep pit filled with water is conducted. From this result, the Rayleigh waves generated in the material by the droplet impingement propagate on the surface of the pit and interfere at the bottom. Therefore the stress generated at the bottom is larger than that of the droplet impingement. This may explain why the deep erosion pits are formed in liquid droplet impingement erosion even though the many droplets uniformly impinge on the entire material surface.
Effect of Bubble Radius on Ability of Submerged Laser Peening Peer-reviewed

Hirotoshi Sasaki, Yuka Iga, Hitoshi Soyama

Lecture Notes in Mechanical Engineering　283-291　2020
Publisher: Springer Singapore
DOI： 10.1007/978-981-15-0054-1_29 　

ISSN： 2195-4356

eISSN： 2195-4364
Numerical Study of Effect of Vapor Bubble Behavior on Wetting Condition in Boiling Flow

Junnosuke Okajima, Peter Stephan

72nd Annual Meeting of the APS Division of Fluid Dynamics, Seattle, Washington (2019.11), P21.00003.　2019/11
Numerical Study of Mechanism of Deep Erosion Pit in High-speed Liquid Droplet Impingement

Yuka Iga, Hirotoshi Sasaki

Proc. 72nd Annual Meeting of the APS Division of Fluid Dynamics　(H24.00009)　2019/11
Experimental and Numerical Studies of Unsteady Cavitation in a Centrifugal Pump for Visualization

Donghyuk Kang, Pin Hu, Junnosuke Okajima, Motohiko Nohmi, Yuka Iga

The 19th International Symposium on Advanced Fluid Information (AFI2019)　(CRF-24)　2019/11
Numerical Investigation of Thermodynamic Parameter in Cavitating flow of Liquid Hydrogen

Masaki Nakano, Le Dinh Anh, Junnosuke Okajima, Iga Yuka

16th International Conference on Flow Dynamics (ICFD2019)　(OS18-47)　2019/11
Visualization of Cavitation Behavior around the Fin in the Heat Exchanger

Ning Yang, Shuichi Moriya, Junnosuke Okajima, Tomokazu Nomura, Yuka Iga

16th International Conference on Flow Dynamics (ICFD2019)　(OS18-46)　2019/11
Development of Temperature Measurement System for Cavitation in High Temperature Water

Taku Hanyuda, Junnosuke Okajima, Yuka Iga

16th International Conference on Flow Dynamics (ICFD2019)　(OS18-45)　2019/11
Experimental Investigation of Unsteady Characteristics of Centrifugal Pump

Shunta TSUCHIYAMA, Junnosuke OKAJIMA, Donghyuk KANG, Motohiko NOHMI, Yuka IGA

16th International Conference on Flow Dynamics (ICFD2019)　(OS18-33)　2019/11
Development of Active Control System for Suppression of Unsteady Cavitation on NACA16-012

Takaho Ochiai, Koki Sugaya, Adrien Turchet, Junnosuke Okajima, Yuka Iga

16th International Conference on Flow Dynamics (ICFD2019)　(OS18-20)　2019/11
超同期旋回キャビテーションの発生に及ぼすインデューサ回転数の影響

近藤創太, 金丸萌菜, 川崎聡, 伊賀由佳

日本機械学会第97期流体工学部門講演会　(OS6-05)　2019/11
NACA16-012 翼形のキャビテーション消滅現象と破断周波数の関係

菅谷航己, Turchet-Gasnier Adrien, 岡島淳之介, 伊賀由佳

日本機械学会第97期流体工学部門講演会　(OS6-04)　2019/11
Experimental and Numerical Study of Hot Water Cavitation on a NACA0015 Hydrofoil

Le Dinh Anh, Junnosuke Okajima, Yuka Iga

The 5th International Conference on Engineering Mechanics and Automation (ICEMA-5), Hanoi (2019.10), pp.39-43.　39-43　2019/10
Numerical analysis of liquid droplet impingement on pitted material surface with water pool of various depth Peer-reviewed

Hirotoshi Sasaki, Yuka Iga

International Journal of Fluid Machinery and Systems　12　(4)　277-284　2019/10

DOI： 10.5293/IJFMS.2019.12.4.277 　

eISSN： 1882-9554
Experimental and Numerical Studies for Unsteady Cavitation in a Centrifugal Pump for Visualization

Pin Hu, Junnosuke Okajima, Donghyuk Kang, Motohiko Nohmi, Yuka Iga

15th Asian International Conference on Fluid Machinery (AICFM15), Busan, Korea (2019.9), P00164.　2019/09
Numerical Study of Appearance of Gaseous Cavitation around a Stator Blade in Torque Converter

Shumpei Takahashi, Tomohiko Usui, Yuka Iga

15th Asian International Conference on Fluid Machinery (AICFM15), Busan, Korea (2019.9), P00011.　2019/09
Characteristics of the Cavitating flow on Heated Hydrofoil

Masaki Ito, Junnosuke Okajima, Yuka Iga

15th Asian International Conference on Fluid Machinery　(P00156)　2019/09
Modification of Energy Equation for Homogeneous Cavitation Simulation with Thermodynamic Effect Peer-reviewed

Anh Dinh Le, Junosuke Okajima, Yuka Iga

Journal of Fluids Engineering, Transactions of the ASME　141　(8)　pp. 081102-1-pp. 081102-12　2019/08
Publisher: ASME International
DOI： 10.1115/1.4042257 　

ISSN： 0098-2202

eISSN： 1528-901X
高速液滴衝突におけるエロージョンの進行メカニズムに関する流体・材料連成数値解析

佐々木裕章, 古屋修, 伊賀由佳

混相流シンポジウム2019　(A221)　2019/08
In-Situ Measurement of Liberation of a Dissolved Gas in Unsteady Cavitating Flow in a Water Peer-reviewed

Daiki Makii, Hirotoshi Sasaki, Yuka Iga

AJKFluids ASME-JSME-KSME Joint Fluids Engineering Conference 2019　5　(AJKFLUIDS2019-5593)　2019/07

DOI： 10.1115/AJKFluids2019-5593 　
An Experimental Study of Influence of Slits in Throat Position on Suppression of Cavitation Instabilities in Liquid Propellant Rocket Inducer Peer-reviewed

Moena Kanamaru, Yoshito Kamikura, Satoshi Kawasaki, Takashi Shimura, Iga Yuka

AJKFluids ASME-JSME-KSME Joint Fluids Engineering Conference 2019　(AJKFLUIDS2019-4838)　2019/07
Numerical simulation study of cavitation in liquefied hydrogen Peer-reviewed

Anh Dinh Le, Junnosuke Okajima, Yuka Iga

Cryogenics　101　29-35　2019/07

DOI： 10.1016/j.cryogenics.2019.04.010 　

ISSN： 0011-2275
Numerical Analysis of Influence of Roughness of Material Surface on High-Speed Liquid Droplet Impingement Peer-reviewed

Hirotoshi Sasaki, Yuka Iga

Journal of Pressure Vessel Technology　141　(3)　pp. 031404-1-pp. 031404-7　2019/06/01
Publisher: ASME International
DOI： 10.1115/1.4043320 　

ISSN： 0094-9930

eISSN： 1528-8978

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This study explains why the deep erosion pits are formed in liquid droplet impingement erosion even though the droplets uniformly impinge on the entire material surface. Liquid droplet impingement erosion occurs in fluid machinery on which droplets impinge at high speed. In the process of erosion, the material surface becomes completely roughened by erosion pits. In addition, most material surface is not completely smooth and has some degree of initial roughness from manufacturing and processing and so on. In this study, to consider the influence of the roughness on the material surface under droplet impingement, a numerical analysis of droplets impinging on the material surface with a single wedge and a single bump was conducted with changing offsets between the droplet impingement centers and the roughness centers on each a wedge bottom and a bump top. As results, two mechanisms are predicted from the present numerical results: the erosion rate accelerates and transitions from the incubation stage to the acceleration stage once roughness occurs on the material surface; the other is that deep erosion pits are formed even in the case of liquid droplets impinging uniformly on the entire material surface.
Investigation of Cavitating flow on a Heated Hydrofoil

Masaki Ito, Junnosuke Okajima, Yuka Iga

10th International Conference on Multiphase Flow　(OC.462)　2019/05
Experimental study of thermodynamic effect of tip leakage cavitation in hot water

Daichi Nakai, Teppei Furusawa, Donghyuk Kang, Yuka Iga

Open Archives of the 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016　2019
Publisher: International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016
A consideration of promotion of dissolved gas separation by dynamic stimulation of unsteady cavitating flow Peer-reviewed

IGA Yuka, MAKII Daiki, SASAKI Hirotoshi

Transactions of the JSME (in Japanese)　85　(878)　19-00217-00217-19-00217　2019
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/transjsme.19-00217 　

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It was shown in the past bench-mark simulation of cavitation that a lift of hydrofoil is underestimated in the break-down region in the condition of transient cavitation at high angle of attack in which cavitation has highly unsteady behavior. The authors assume that one of the reasons of the underestimation is lack of consideration of liberation of dissolved non-condensable gas and assuming the threshold of cavitation appearance at saturated vapor pressure in all the conventional numerical method of cavitation. In the present experiment of cavitation tunnel, it was shown that the liberation amount of dissolved oxygen is larger in unsteady cavitating flow than in quasi-steady cavitating flow although the cavity volumes are almost same. The experimental result gives a reason on the assumption and indicates that the dynamic stimulation with unsteady cavitating flow causes the liberation of non-condensable gas. In the numerical simulation of cavitation, the dynamic stimulation was modeled by turbulent energy, Reynolds stress, production term and baroclinic torque, respectively. The liberation models were applied for homogeneous numerical method of vaporous cavitation, then the threshold value of appearance of cavitation changes according to the local flow field. In the numerical result, it was shown that the underestimation of lift was partially improved by considering liberation of non-condensable gas by the dynamic stimulation of baroclinic torque in the unsteady cavitating flow.
Numerical Study of a Bubble Colapse Near a Wall by Fluid/Material Coupled Numerical Simulation

Yuka IGA, Hirotoshi SASAKI

2019 Japan-China-Korea Hydraulic Machine Workshop at the WASEDA University, Tokyo, Japan(2019.1), HMW-17.　(HMW-17)　2019/01
Thermodynamic Effect of Tip-Leakage-Vortex Cavitation on Two-dimensional Hydrofoils with Tip Clearance for Hot Water Peer-reviewed

Donghyuk KANG, Daichi NAKAI, Yuka IGA

International Journal of Fluid Machinery and Systems　12　(4)　368-379　2019
CFD Calculation of Cavitation in Outboard Motors

南郷あや香, 伊賀由佳

Honda R&D technical review　30　(2)　114-119　2018/10
Publisher: 本田技術研究所
ISSN： 0915-3918
One-dimensional analysis method for cavitation instabilities of a rotating machinery Peer-reviewed

Satoshi Kawasaki, Takashi Shimura, Masaharu Uchiumi, Yuka Iga

Journal of Fluids Engineering, Transactions of the ASME　140　(2)　2018/02/01

DOI： 10.1115/1.4037987 　

ISSN： 1528-901X 0098-2202
Numerical Analysis of Suppression Effect of Asymmetric Slit on Cavitation Instabilities in Cascade Peer-reviewed

Hiroki Kobayashi, Ryosuke Hagiwara, Satoshi Kawasaki, Masaharu Uchiumi, Kazuyuki Yada, Yuka Iga

Journal of Fluids Engineering, Transactions of the ASME　140　(2)　2018/02/01

DOI： 10.1115/1.4037989 　

ISSN： 1528-901X 0098-2202
"Numerical Analysis of the Influence of the Symmetrical Slits in an Inducer on the Suppression of Oscillating Cavitation"

第59回航空原動機・宇宙推進講演会, 岐阜(2019.3.6-7(7)), B8, No.2B15　2018
NACA16-012翼形に発生するキャビテーションの消滅現象の非定常特性に関する研究

大平佳生, 渡邉聡, 伊賀由佳

第19回キャビテーションに関するシンポジウム, 札幌(2018.10.18-19(18)), No.19　2018
水中レーザピーニングの加工能力における気泡径の影響

佐々木裕章, 伊賀由佳, 祖山均

第19回キャビテーションに関するシンポジウム, 札幌(2018.10.18-19(19)), No. 25　2018
スリット付きインデューサの旋回キャビテーション抑制に関する実験

上倉義人, 金丸萌菜, 川崎聡, 志村隆, 伊賀由佳

ターボ機械協会第80回学術講演会, 仙台(2018.10.12), No.C13　2018
"Influence of flow stimulation on occurrence of gaseous cavitation in hydraulic oil"

井畑陽輔, 薄井友彦, 伊賀由佳

日本流体力学会年会2018，豊中(2018.9.3-6(5))，No.121　2018
キャビテーション流れの非定常性と溶存気体析出との関係に関する実験的研究

伊賀由佳, 槙井大輝

第19回キャビテーションに関するシンポジウム, 札幌(2018.10.18-19(19)), No.29, pp.1-6　2018
Study on Gaseous Cavitation around a Hydrofoil in Oil Flow

Shumpei Takahashi, Tomohiko Usui, Yuka IGA

Fifteenth International Conference on Flow Dynamics (ICFD2018), Sendai, Miyagi (2018.11), Session Type：OS18，Presentation No：41　2018
An Experimental Study on Suppression of Rotating Cavitation in Rocket Turbopump Inducer with Slit

Yoshito Kaikura, Moena Kanamaru, Satoshi Kawasaki, Takashi Shimura, Yuka Iga

Fifteenth International Conference on Flow Dynamics (ICFD2018), Sendai, Miyagi (2018.11), Session Type：OS18，Presentation No：34　2018
Observation of Cavitating Flow on a Heated Hydrofoil

Masaki Ito, Junnosuke Okajima, Hirotoshi Sasaki, Tomokazu Nomura, Yuka Iga

Fifteenth International Conference on Flow Dynamics (ICFD2018), Sendai, Miyagi (2018.11), Session Type：OS18，Presentation No：22　2018
Numerical Simulation of Cavitating Flow with Thermodynamic Effects of Cavitation

Anh Dinh Le, Yuka Iga

The International Conference on Fluid Machinery and Automation Systems (ICFMAS2018), Hanoi, Vietnam (2018.10), ICFMAS071　2018
Experimental Study of Disappearance Phenomenon of Unsteady Cavitation on NACA16-012

Yoshiki Odaira, Wakana Tsuru, Satoshi Watanabe, Yuka Iga

Proc. The 10th International Symposium on Cavitation (CAV2018), Baltmore, USA (2018.5), No. Cavitation in Fluid Machinery I -1.　2018
Interaction between Thermodynamic Suppression Effect and Reynolds Number Promotion Effect on Cavitation in Hot Water

Yuka Iga, Teppei Furusawa, Hiritoshi Sasaki

Proc. The 10th International Symposium on Cavitation (CAV2018), Baltmore, USA (2018.5), No. Thermal effects-2.　2018
Three dimensional numerical analysis of inducer about suppression of cavitation instabilities by asymmetric slits on blades Peer-reviewed

Yoshito Kamikura, Hiroki Kobayashi, Satoshi Kawasaki, Yuka Iga

29th IAHR Symposium on Hydraulic Machinery and Systems, Kyoto, Japan(2018.9), No.371.　2018
A Simplified Thermodynamic Effect Model for Cavitating Flow in Hot Water Peer-reviewed

Anh Dinh Le, Yuka IGA

29th IAHR Symposium on Hydraulic Machinery and Systems, Kyoto, Japan(2018.9), No.171.　2018
Numerical Analysis of Liquid Droplet Impingement on Rough Material Surface with Water Pool Peer-reviewed

Hirotoshi SASAKI, Yuka IGA

29th IAHR Symposium on Hydraulic Machinery and Systems, Kyoto, Japan(2018.9), No.386.　2018
Development of gaseous cavitation model in hydraulic oil flow considering the effect of dynamic stimulation Peer-reviewed

Yosuke IBATA, Yudai MATSUURA, Shunpei TAKAHASHI, Yuka IGA

29th IAHR Symposium on Hydraulic Machinery and Systems, Kyoto, Japan(2018.9), No.314.　2018
Special Issue of the Fourteenth International Conference on Flow Dynamics (ICFD2017) Preface Peer-reviewed

Tokumasu Takashi, Hirota Makoto, Iga Yuka, Nakamura Hisashi, Shimoyama Koji, Takana Hidemasa

JOURNAL OF FLUID SCIENCE AND TECHNOLOGY　13　(4)　2018

DOI： 10.1299/jfst.2018jfst0022 　

ISSN： 1880-5558
材料表面の荒れと液膜が高速液滴衝突の衝撃に及ぼす影響

佐々木裕章, 伊賀由佳

ターボ機械協会第78回富山講演会, 富山(2017.9.15), No.B13　2017
外部空気流付加による水ジェットの微粒化とデンタルプラーク洗浄への応用に関する研究

守谷修一, 伊賀由佳, 佐々木裕章, 佐藤岳彦, 圓山重直

混相流シンポジウム2017, 電気通信大学, 東京(2017.8.19-21(20)), No. E222　2017
Thermodynamic Effect on Tip Leakage Vortex Cavitation

Donghyuk KANG, Yuka IGA

The 7th International Symposium on Advanced Fluid Information (AFI2017), Sendai, Japan (2017.11), No. CRF-58, pp. 118-119.　2017
A Thermodynamic Effect in a Tip Leakage Vortex Cavitation around a Hydrofoil in Hot Water

Donghyuk KANG, Daichi NAKAI, Yuka IGA

The 9th JSME-KSME Thermal and Fluids Engineering Conference, Okinawa, Japan (2017.10), No. TFEC9-1471.　2017
An Experimental Study of Influence of a Slit on Cavitation Characteristics in a Single Hydrofoil

Hiroki Kobayashi, Satoshi Kawasaki, Yuka Iga

The 9th JSME-KSME Thermal and Fluids Engineering Conference, Okinawa, Japan (2017.10), No. TEFC-1329.　2017
Fluid/Material Coupled Numerical Analysis of Relationship between Behavior of Bubble Collapse and Distribution of Stress in Material

Hirotoshi SASAKI, Susumu ENDO, Yuka IGA

The 9th JSME-KSME Thermal and Fluids Engineering Conference, Okinawa, Japan (2017.10), No. TEFC9-1251.　2017
Simplified Modeling of Cavitating Flow with Thermodynamic Effect for Homogeneous Model Peer-reviewed

Le Dinh ANH, Yuka IGA

17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC17), Maui (2017.12), No. 404. (pp. 7 pages)　2017
A Fundamental Study of Disappearance Phenomenon of Partial Cavitation on the NACA 16012 Hydrofoil Peer-reviewed

Yoshiki OODAIRA, Wakana TSURU, Satoshi WATANABE, Yuka IGA

17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC17), Maui (2017.12), No. 67. (pp. 5 pages)　2017
Investigation of the influence of discharge inside plasma-induced bubble

KAMATA Sayaka, SUPPONEN Outi, KANAZAWA Seiji, IGA Yuka, NAKAJIMA Tomoki, FARHAT Mohamed, SATO Takehiko

The Proceedings of Conference of Tohoku Branch　2017　(0)　2017
Publisher: 一般社団法人日本機械学会
Numerical Analysis of Cavitation in Hydraulic Oil Flow Considering Liberation of Dissolved Gas

MATSUURA Yudai, KUMAGAI Kento, IGA Yuka

The Proceedings of Conference of Tohoku Branch　2017　(0)　2017
Publisher: 一般社団法人日本機械学会
A fundamental study on disappearance of partial cavitation on the NACA16012 hydrofoil

OODAIRA Yoshiki, TSURU Wakana, WATANABE Satoshi, IGA Yuka

The Proceedings of Conference of Tohoku Branch　2017　(0)　2017
Publisher: 一般社団法人日本機械学会
Experimental study of appearance of thermodynamic effect on cavitation in hot water Peer-reviewed

IGA Yuka, FURUSAWA Teppei

Transactions of the JSME (in Japanese)　83　(845)　16-00377-16-00377　2017
Publisher: 一般社団法人日本機械学会
DOI： 10.1299/transjsme.16-00377 　

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In this study, in order to clarify a relation between thermodynamic effect, which suppresses cavitation, and scale effect, which promotes cavitation, tunnel experiment was done with NACA16012 single hydrofoil in hot water. Appearance of the effects was estimated by occurrence region of cavitation for angle of attack vs cavitation number and variation of cavitation patterns. Main flow temperature was 30°C and 70°C. By increasing main flow temperature under constant Reynolds number condition, scale effect was took away to some extent and thermodynamic effect was picked out. From the result, occurrence resin of cavitation was suppressed in 70°C hot water, where it is empirically known that thermodynamic effect does not appear in such a low temperature. The result indicates that thermodynamic effect and scale effect, which are conflicting effects, cancelled each other in water at 70°C. Additionally it was shown that occurrence of cavitation was drastically suppressed in a condition of specific angle of attack.
Special Issue of the Thirteenth International Conference on Flow Dynamics (ICFD2016) Preface Peer-reviewed

Niimi Tomohide, Iga Yuka, Nakamura Hisashi, Shimoyama Koji, Takana Hidemasa, Tokumasu Takashi

JOURNAL OF FLUID SCIENCE AND TECHNOLOGY　12　(3)　2017

DOI： 10.1299/jfst.2017jfst0020 　

ISSN： 1880-5558
Numerical modeling of gaseous cavitation in cfd of hydraulic oil flow based on dynamic stimulation Peer-reviewed

Yudai Matsuura, Kento Kumagai, Yuka Iga

ASME/BATH 2017 Symposium on Fluid Power and Motion Control, FPMC 2017　2017

DOI： 10.1115/FPMC2017-4219 　

ISSN： 2475-7004
Preface (Special Issue of the Twelfth International Conference on Flow Dynamics (ICFD2015)) Peer-reviewed

Hideya Nishiyama, Yuji Hattori, Yuka Iga, Hidemasa Takana, Takashi Tokumasu, Shigeru Yonemura

Journal of Fluid Science and Technology　11　(4)　JFST0020-1　2016/12/28

DOI： 10.1299/jfst.2016jfst0020 　

ISSN： 1880-5558
Design and Feasibility Analysis of Microscale Bumped Channel With Supersonic Flow for Electronics Cooling Peer-reviewed

Yuya Takahashi, Lin Chen, Junnosuke Okajima, Yuka Iga, Atsuki Komiya, Wu-Shung Fu, Shigenao Maruyama

JOURNAL OF MICROELECTROMECHANICAL SYSTEMS　25　(6)　1033-1040　2016/12

DOI： 10.1109/JMEMS.2016.2613942 　

ISSN： 1057-7157

eISSN： 1941-0158
Experimental Study of Methane Hydrate Dissociation and Gas Production Behaviors under Depressurization

Hikaru Yamada, Lin Chen, Guillaume Lacaille, Eita Shoji, Junnosuke Okajima, Yuka Iga, Atsuki Komiya, Shigenao Maruyama

Conference Abstract of the 6th International Conference on Power and Energy Systems　28　2016/11
Energy from Methane Hydrate: System Design, Numerical Modeling and Experimental Verifications

Lin Chen, Hikaru Yamada, Yuki Kanda, Hirotoshi Sasaki, Junnosuke Okajima, Yuka Iga, Atsuki Komiya, Shigenao Maruyama

Conference Abstract of the 6th International Conference on Power and Energy Systems　25-26　2016/11
An experimental study of cavitation on a hydrofoil with tip clearance and slit

Hiroki Kobayashi, Satoshi Kawasaki, Yuka Iga

The 7th International Symposium on Fluid Machinery and Fluids Engineering(ISFMFE2016)　2016/10/19
Influence of Cavitation Model on Cavity Surface Transition in a Nozzle

Le Dinh Anh, Yuka Iga

The 13th International Conference on Flow Dynamics(ICFD2016)　2016/10/11
Thermodynamic Effect on Tip Leakage Vortex Cavitation

Donghyuk KANG, Daichi NAKAI, Yuka IGA

The 13th International Conference on Flow Dynamics(ICFD2016)　2016/10/11
A Fundamental Research of Inception of Gaseous Cavitation in Hydraulic Oil

Sataro Tateishi, Kento Kumagai, Yuka Iga

The 13th International Conference on Flow Dynamics(ICFD2016)　2016/10/10
Interferometric measurement and numerical comparisons of supersonic heat transfer flows in microchannel Peer-reviewed

Yuya Takahashi, Lin Chen, Junnosuke Okajima, Yuka Iga, Atsuki Komiya, Shigenao Maruyama

APPLIED THERMAL ENGINEERING　109　582-590　2016/10

DOI： 10.1016/j.applthermaleng.2016.08.108 　

ISSN： 1359-4311
高温水中の翼形キャビテーションの内部温度 Peer-reviewed

伊賀由佳, 山口優貴

日本機械学会論文集　82　(837)　15-00548　2016/05

DOI： 10.1299/transjsme.15-00548 　
Experimental Study of Thermodynamic Effect of Tip Vortex Cavitation in Hot Water Peer-reviewed

Daichi Nakai, Tepei Furusawa, Donghyuk Kang, Yuka Iga

International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2016)　2016/04/15
One-Dimensional Analysis Method for Cavitation Instabilities of a Rotating Machinery Peer-reviewed

Satoshi Kawasai, Masaharu Uchiumi, Takashi Shimura, Yuka Iga

International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2016)　2016/04/15
Numerical Analysis of Supression Effect of Random Slit on Rotating Cavitation and Cavitation Surge in Cascade Peer-reviewed

Hiroki Kobayashi, Ryosuke Hagiwara, Kawasaki Satoshi, Masaharu Uchiumi, Yada Kazuyuki, Yuka Iga

International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2016)　2016/04/11
流体・材料達成数値解析による高速液滴衝突現象の数値的研究 Peer-reviewed

佐々木裕章, 落合直哉, 伊賀由佳

混相流　30　(1)　65-74　2016/01
Publisher: THE JAPANESE SOCIETY FOR MULTIPHASE FLOW
DOI： 10.3811/jjmf.30.65 　

ISSN： 0914-2843

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Serious damages are possibly caused by high-speed Liquid Droplet Impingement (LDI) on the material surface. In particular, the wear by LDI in piping system of nuclear power plant is becoming great problem in recent years because of high aging operation. Therefore, it is important for the safety of piping systems in nuclear power plant to evaluate accurately effect of high speed LDI on the inner pipe wall. In this study, by using our in-house fluid/material two-way coupled numerical method which considers reflection and transmission on the fluid/material interface, high-speed LDI on material surface is simulated. The algorithm of two-way coupled method at fluid/material interface is applied as follows: fluid pressure on material surface and normal stress of vertical direction of material surface are obtained by considering reflection and transmission of pressure and stress waves based on acoustic impedance. Nonslip condition is adopted on fluid/material surface, where the vertical velocity has the values obtained by considering reflection and transmission and the tangential velocity of fluid has the same velocity of material which is calculated by material analysis. From the numerical results, it is shown that variation of impingement velocity has an effect of linear for maximum pressure and equivalent stress but variation of droplet diameter has little an effect of these values.
Numerical analysis of damping effect of liquid film on material in high speed liquid droplet impingement Peer-reviewed

Hirotoshi Sasaki, Naoya Ochiai, Yuka Iga

International Journal of Fluid Machinery and Systems　9　(1)　57-65　2016
Publisher: Turbomachinery Society of Japan
DOI： 10.5293/IJFMS.2016.9.1.057 　

ISSN： 1882-9554

eISSN： 1882-9554
Study of methane hydrate as a future energy resource: low emission extraction and power generation Peer-reviewed

L. Chen, H. Yamada, Y. Kanda, H. Sasaki, J. Okajima, Y. Iga, A. Komiya, S. Maruyama

2016 INTERNATIONAL CONFERENCE ON NEW ENERGY AND FUTURE ENERGY SYSTEM (NEFES 2016)　40　012074　2016

DOI： 10.1088/1755-1315/40/1/012074 　

ISSN： 1755-1307
気泡崩壊挙動と材料内応力分布の関係に関する流体・材料連成数値解析

遠藤奨, 佐々木裕章, 伊賀由佳

第18回キャビテーションに関するシンポジウム, 福岡(2016.12.8-9(8)), No.0009　2016
一次元マルチドメイン解析によるインデューサのキャビテーション動特性に関する考察

川崎聡, 内海政春, 志村隆, 伊賀由佳

第18回キャビテーションに関するシンポジウム, 福岡(2016.12.8-9(9)), No.0030　2016
"Influence of Thermodynamic Effect on Growth and Collapse of Cavitation"

中井大地, 佐々木裕章, 姜東赫, 能見基彦, 安炳辰, 伊賀由佳

日本機械学会第94期流体工学部門講演会, 山口(2016.11.12-13(12)), OS9-1, No.0904　2016　(0)　904-904　2016
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmefed.2016.0904 　

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Cavitation experiments was conducted with high temperature and high pressure cavitation tunnel to investigate thermodynamic effect on tip leakage cavitation. NACA0009 hydrofoil with tip clearance is chosen for a test body. In the experiments results, at T_∞ = 90 ^oC, the large amplitudes are observed at the higher frequencies than 50 Hz. These can be considered because collapse time of cavity was shortened by thermodynamic effect. Moreover, the temperature depression inside tip leakage cavity increases with the increase of the thermodynamic parameter.
高速液滴衝突における材料表面液膜の影響に関する流体・材料連成数値解析

佐々木裕章, 伊賀由佳

ターボ機械協会第76回北見講演会, 北見(2016.9.30), No.B8　2016
"Numerical analysis of cavitation bubble collapse during high-speed liquid droplet impingement by fluid/material coupled method"

佐々木裕章, 伊賀由佳

流体力学会年会2016, 名古屋(2016.9.26-28(27)), No.226　2016
"Numerical Analysis of Effect of Ambient Temperature in Collapse of a Hemispherical Bubble"

遠藤奨, 佐々木裕章, 伊賀由佳

日本機械学会東北支部第51期総会・講演会, 仙台(2016.3.11)，No.124　2016　(51)　45-46　2016
Publisher: The Japan Society of Mechanical Engineers
同期旋回キャビテーション下のキャビティ長さ不均一について

吉田義樹, 沖田耕一, 笹尾好史, 長谷川敏, 島垣満, 中村憲明, 伊賀由佳

日本機械学会2006年度年次大会講演論文集, 熊本(2006.9), No.06-1 Vol.?, 195-196頁　2016
油中キャビテーションの数値解析モデルの検討

伊賀由佳, 松浦優大, 立石佐太郎

第18回キャビテーションに関するシンポジウム, 福岡(2016.12.8-9(8)), No.0010　2016
Fluid/Material Coupled Numerical Analysis of Thermal Effect on Non-spherical Bubble Collapse

Susumu ENDO, Hirotoshi SASAKI, Yuka IGA

Proceedings of Twelfth International Conference on Flow Dynamics (ICFD2015)　2015/10/28
Thermodynamic Effect on Tip Leakage Vortex Cavitation

Donghyuk KANG, Daichi NAKAI, Tepei FURUSAWA, Yuka IGA

Proceedings of the 15 th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI -2015)　2015/10/28
Influence of Single-Phase Turbulence Model on Reynolds Number Effect on Cavitation Pattern in a Nozzle Peer-reviewed

Anh Dinh LE, An BYUNGJIN, Motohiko NOHMI, Yuka IGA

Proceedings of the 13th Asian International Conference of Fluid Machinery (AICFM13)　2015/09/09
Suppression of Cavitation Instabilities in a Cascade by Using a Random Slit Peer-reviewed

Ryosuke HAGIWARA, Yuka IGA

Proceedings of the 13th Asian International Conference of Fluid Machinery (AICFM13)　2015/09/09
Numerical Analysis of High Speed Liquid Droplet Impingement by Fluid/Material Coupled Numerical Method Peer-reviewed

Hirotoshi SASAKI, Naoya OCHIAI, Yuka IGA

Proceedings of the 13th Asian International Conference of Fluid Machinery (AICFM13)　2015/09/09
The numerical Analysis of Control Effect on Cavitation Instabilities in a Cascade with a Random Slit Peer-reviewed

Ryosuke HAGIWARA, Yuka IGA

Proceedings of the ASME-JSME-KSME Joint Fluids Engineering Conference 2015　2015/07/30
Numerical Analysis of Liquid Droplet Impinginent Erosion Considering the Fluid/Material Factors Peer-reviewed

Hirotoshi SASAKI, Naoya OCHIAI, Yuka IGA

Proceedings of ICONE-23　2015-January　2015/05/19
高温高圧水タンネル実験によるキャビティ内温度計測 Peer-reviewed

伊賀由佳, 山口優貴

ターボ機械　43　(3)　177-184　2015/03
Publisher:
DOI： 10.11458/tsj.43.3_177 　

ISSN： 0385-8839
Consideration of a Phase Change Model Based on Apparent Phase Equilibrium Peer-reviewed

S. Kashiwada, Y. Iga

9TH INTERNATIONAL SYMPOSIUM ON CAVITATION (CAV2015)　656　2015

DOI： 10.1088/1742-6596/656/1/012129 　

ISSN： 1742-6588
Mechanical Surface Treatment of Duralumin Plate by Bubble Induced by Pulse Laser Peer-reviewed

H. Soyama, H. Sasaki, S. Endo, Y. Iga

9TH INTERNATIONAL SYMPOSIUM ON CAVITATION (CAV2015)　656　2015

DOI： 10.1088/1742-6596/656/1/012108 　

ISSN： 1742-6588
気液平衡二相流動方程式の定式化と一次元ノズルの挙動

円山重直, 伊賀由佳, 岡島淳之介

日本機械学会熱工学コンファレンス2015 講演論文集, 大阪吹田(2015.10.24-25(24)), No.B141　2015
“Evaluation of the Micro Supersonic Nozzle Geometry for the High Heat Flux Heat Sink”

日本機械学会熱工学コンファレンス2015 講演論文集, 大阪吹田(2015.10.24-25(25)), No.A222　2015
"Thermodynamic Effect and Scale Effect on Cavitation Inception around NACA16012 Hydrofoil"

古澤哲平, 伊賀由佳

日本流体力学会年会2015, 東京(2015.9.26-28(27)), No.142　2015
"Numerical Analysis of Flow Velocity Dependence on Wear Rate in Liquid Droplet Impingement Erosion"

佐々木裕章, 伊賀由佳

混相流シンポジウム2105, 高知(2015.8.4-6(6)), No.D313　2015
“Estimation of cooling performance of high heat flux heat sink using supersonic flow?inside a micro channel with asymmetric converging-diverging nozzle”

第52回日本伝熱シンポジウム講演論文集, 福岡(2015.6.3-5(4)), No. E231　2015
"Effect of Temperature and Reynolds Number on Cavitation Pattern"

古澤哲平, 山口優貴, 伊賀由佳

日本機械学会東北支部第50期総会・講演会, 仙台(2015.3.13)，No.203　2015
"Numerical Analysis of Unsteady Cavitating Flow by a Phase Change Model Taking into Account the Effect of Dissolved Gas"

柏田峻, 伊賀由佳

日本機械学会東北支部第50期総会・講演会, 仙台(2015.3.13), No.204　2015
【展望・解説】キャビテーション不安定現象のシミュレーション

伊賀由佳, 姜東赫

ターボ機械　42　(12)　1-13　2014/12
Publisher: ターボ機械協会
Measurement of Density Field of Supersonic Flow inside a Micro-channel by using Phase Shifting Interferometer

Yuya Takahashi, Junnosuke Okajima, Yuka Iga, Atsuki Komiya, Shigenao Maruyama

Proceedings of 25th International Symposium on Transport Phenomena　2014/11/06
Influence of Pipe Length on Cavitation Surge Frequency in a Cascade Peer-reviewed

Yuka Iga, Yoshiki Yoshida

JOURNAL OF PROPULSION AND POWER　30　(6)　1520-1527　2014/11

DOI： 10.2514/1.B35229 　

ISSN： 0748-4658

eISSN： 1533-3876
Numerical Analysis of Unsteady Cavitation and Cavitation Instabilities by Using Compressible Homogeneous Model Invited Peer-reviewed

Yuka IGA

Proc. International Symposium of Cavitation and Multiphase Flow (ISCM 2014)　2014/10/19
Effect of single-phase turbulence model on 3-D structure of cavitation inside a nozzle

Anh.D. LE, Yuki YAMAGUCHI, Motohiko NOHMI, Yuka IGA

Proc. Eleventh International Conference on Flow Dynamics (ICFD2014)　2014/10/08
Numerical Analysis Behavior of Cavitation Bubble in Liquid Droplet Impingement

Hirotoshi Sasaki, Naoya Ochiai, Yuka Iga

Proc. Eleventh International Conference on Flow Dynamic　2014/10/08
Thermodynamic Effect on Cavitation in High Temperature Water Peer-reviewed

Yuki Yamaguchi, Yuka Iga

ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING - 2014, VOL 2: FORA　2014

DOI： 10.1115/FEDSM2014-21433 　
Numerical analysis of unsteady cavitating flow by using a modification based on an assumption of apparent phase equilibrium Peer-reviewed

Y. Iga

27TH IAHR SYMPOSIUM ON HYDRAULIC MACHINERY AND SYSTEMS (IAHR 2014), PTS 1-7　22　1-11　2014

DOI： 10.1088/1755-1315/22/5/052010 　

ISSN： 1755-1307
"Numerical Analysis of Occurrence of Cavitation Bubble in Liquid Droplet Impingement"

佐々木裕章, 落合直哉, 伊賀由佳

日本機械学会第27回計算力学講演会(CMD2014), 盛岡(2014.11.22), No.234　2014
Thermodynamic Effect on Cavitation in High Temperature Water

Yuki Yamaguchi, Yuka Iga

ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING - 2014, VOL 2: FORA　2014
キャビティ体積の予測精度向上を目的とした相変化モデルの検討

柏田峻, 伊賀由佳

キャビテーションに関するシンポジウム(第17回), 東京(2014.11.20-21), No.0031　2014
Effect of Flow Velocity on Structure of Cavity Surface in 2-D Nozzle

34　(1)　321-326　2014
Publisher:
ISSN： 0916-4731
“Measurement of the Supersonic Flow in a Micro-channel for High Heat Flux Heat Sink“

第51回日本伝熱シンポジウム講演論文集, 浜松(2014.5.21-23(22)), No. E233　2014
“Evaluation of Heat Transfer Characteristics and Structure of Turbulent Natural Convection in Vertical Parallel by Large Eddy Simulation“

古川琢磨, 岡島淳之介, 小宮敦樹, 伊賀由佳, 円山重直

第51回日本伝熱シンポジウム講演論文集, 浜松(2014.5.21-23(21)), Vol.1, BSP209 (Poster)　2014
気液相平衡における二相流熱力学モデルの検討とその応用例

馬場涼仁, 伊賀由佳, 岡島淳之介, 圓山重直

第14回日本伝熱学会東北支部学生発表会，仙台(2014.5.10), Vol.14，7-8頁　2014
液体窒素中の対称翼に発生するキャビテーションの数値解析

辻田光宏, 中島隆広, 新井山一樹, 伊賀由佳, 杉本康弘, 佐藤恵一

日本機械学会北陸信越学生会第43回学生員卒業研究発表講演会, 富山(2014.3.7), No. 0103　2014
高温高圧水キャビテーションタンネル実験設備の概要

伊賀由佳, 山口優貴

ターボ機械協会第71回総会講演会, 東京(2014.5.9), 1-6頁 (USB)　2014
Calculation of Turbulent Characteristic of Natural Convection in Parallel Heated Plates at High Rayleigh Number by Large Eddy Simulation

Takuma KOGAWA, Junnosuke OKAJIMA, Yuka IGA, Atsuki KOMIYA, Shigenao MARUYAMA

Proc. 11th International Conference on Flow Dynamics (ICFD2014), Sendai (2014), pp. 504-505.　2014
Density Measurement of Supersonic Air Flow Inside a Bumped Micro-channel using Interferometer

Yuya TAKAHASHI, Junnosuke OKAJIMA, Yuka IGA, Atsuki KOMIYA, Shigenao MARUYAMA

Proc. 11th International Conference on Flow Dynamics (ICFD2014), Sendai (2014), pp. 344-345.　2014
Preliminary Experiment of Supersonic Micro-channel Gas Flow Visualization by using Interferometer Peer-reviewed

Yuya TAKAHASHI, Junnosuke OKAJIMA, Yuka IGA, Atsuki KOMIYA, Shigenao MARUYAMA

Journal of Fluid Science and Technology, Vol. 9, No. 5 (2014), No. JFST0069.　9　(5)　JFST0069-JFST0069　2014
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jfst.2014jfst0069 　

ISSN： 1880-5558

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In this study, a cooling device using supersonic flow inside a micro-channel has been evaluated. To confirm the density measurement and temperature estimation of the supersonic air flow inside a micro-channel, a preliminary experiment using an interferometer was conducted. A single micro-channel was fabricated in a small Si plate, which was made using Micro-Electro-Mechanical System (MEMS) technology. The channel size was approximately 200 μm in width, 500 μm in depth, and 6000 μm in length. The Deep Reactive-Ion-Etching (Deep-RIE) method was used for fabricating of the channel. A fabricated Si plate was sandwiched between glass plates. The density field of the supersonic/subsonic air flow near inlet and outlet were recorded as phase-shifted data using a phase-shifting interferometer. The pressure at the inlet, outlet, and inside the channel were set to 0.7 and 0.1 MPaA, respectively. The density field of the micro-channel air flow was evaluated despite the fringe number being less than one. This experimental result was compared with numerical simulation. From the comparison, the measured density field exhibited a good agreement with the numerical results, and the temperature field could be estimated. It was confirmed that this method was valid for the density measurement and the sophisticated visualization of the supersonic air flow inside a micro-channel.
Study of Quantitative Numerical Prediction of Cavitation Erosion in Cavitating Flow Peer-reviewed

Naoya Ochiai, Yuka Iga, Motohiko Nohmi, Toshiaki Ikohagi

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　135　(1)　011302-1-011302-10　2013/01

DOI： 10.1115/1.4023072 　

ISSN： 0098-2202

eISSN： 1528-901X
ＬＥＳによる平行平板間における乱流自然対流熱伝達の熱流動特性評価

古川琢磨, 岡島淳之介, 伊賀由佳, 小宮敦樹, 円山重直

熱工学コンファレンス2013 講演論文集, 弘前(2013.10.19-20), 443-444頁　2013
超音速マイクロノズルを適用した冷却フィンの冷却特性

髙橋佑弥, 岡島淳之介, 伊賀由佳, 小宮敦樹, 円山重直

第13回日本伝熱学会学生発表会講演論文集, 仙台(2013.5.11), 19-20頁　2013
“Supersonic Micro-nozzle for Utilization of Cooling Devic“

日本機械学会東北支部第48期総会・講演会講演論文集, 仙台(2013.3.15), 164-165頁　2013
Evaluation of Heat Transfer of Turbulent Natural Convection in Vertical Parallel Plates by Large Eddy Simulation

Takuma Kogawa, Junnosuke Okajima, Yuka Iga, Atsuki Komiya, Shigenao Maruyama

2013
Preliminary Experiment of Supersonic Micro-channel Gas Flow Visualization by Using

Yuya Takahashi, Junnosuke Okajima, Yuka Iga, Atsuki Komiya, Shigenao Maruyama

2013
Thermal Effects in Bubble Clouds of Cavitation

Kazuki NIIYAMA, Yuka IGA

Proc. the 13th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI/TFI-2013), Sendai (2013), CRF-7, pp.14-15 (Poster).　2013
STUDY OF SUPERSONIC MICRO-CHANNEL FOR COOLING ELECTRONIC DEVICES Peer-reviewed

Yuya Takahashi, Junnosuke Okajima, Yuka Iga, Atsuki Komiya, Wu-Shung Fu, Shigenao Maruyama

PROCEEDINGS OF THE 11TH INTERNATIONAL CONFERENCE ON NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS, 2013　2013
Numerical Prediction of Cavitation Erosion Using a Coupled Analysis of Cavitating Flow Field and Bubbles

Naoya Ochiai, Yuka Iga, Motohiko Nohmi, Toshiaki Ikohagi, Jun Ishimoto, Kozo Saito

Proceedings of the 12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11
Numerical Study of Influence of Initial Standoff Distance on Impulsive Pressure Induced by Single Bubble Collapse near Wall Boundary (Integration to the Next-generation Megasonic Cavitation Cleaning Technology)

Naoya Ochiai, Yuka Iga, Motohiko Nohmi, Toshiyuki Ikohagi, Jun Ishimoto

Proceedings of the 12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11
Mechanism of Thermal Effects in Micro-bubble Cavitation

Yuka IGA, Kazuki NIIYAMA

Proc. 12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI/TFI-2011)　40-41　2012/09/20
Phase Change Model based on the Idea of Apparent Phase Equilibrium in Unsteady Cavitating Flow Peer-reviewed

Yuka Iga

Proc. The 8th International Symposium on Cavitation (CAV2012)　2012/08/15
Advancement of Prediction Accuracy of Transient Cavitating Flow around a Hydrofoil

Yuka Iga

Proc. The Eighth KSME-JSME Thermal and Fluids Engineering Conference (8th TFEC)　2012/03/20
Numerical analysis of the influence of acceleration on cavitation instabilities that arise in cascade Peer-reviewed

Yuka Iga, Tasuku Konno

International Journal of Fluid Machinery and Systems　5　(1)　1-9　2012/03

DOI： 10.5293/IJFMS.2011.5.1.001 　

ISSN： 1882-9554
マイクロチャネルにおける気泡の熱流動挙動に関する数値解析

岡島淳之介, 包乾, 伊賀由佳, 円山重直

熱工学コンフェレンス講演論文集, 熊本(2012.11.17-18), 131-132頁　2012
キャビテーションの熱力学的効果に対する気泡周囲温度拡散の影響

新井山一樹, 伊賀由佳, 吉田義樹, 尾池守

日本機械学会流体工学部門講演会, 京都(2012.11.17-18), No.0304, pp.133-134　2012
気泡核分布の影響を考慮したキャビテーションエロージョンの数値予測

落合直哉, 伊賀由佳, 能見基彦, 井小萩利明

日本混相流学会年会講演会2012 講演論文集, 千葉柏(2012.8.9-11), No. D325, pp.336-337　2012
均質モデルによる極低温流体中の翼形まわりに発生するキャビテーションの数値解析

伊賀由佳, 新井山一樹

第16回キャビテーションに関するシンポジウム講演論文集, 金沢(2012.11.23-24(24)), No.S1-6, pp.1-6 (USB)　2012
見掛けの相平衡を仮定した相変化モデルによる遷移キャビテーション流れの数値解析

伊賀由佳

日本機械学会東北支部第48期秋季講演会講演論文集, 八戸(2012.9.22), pp.74-75　2012
ON BOUNDARY CONDITIONS FOR CAVITATION CFD AND SYSTEM DYNAMICS OF CLOSED LOOP CHANNEL Peer-reviewed

Motohiko Nohmi, Toshiaki Ikohagi, Yuka Iga

FLUID MEASUREMENTS AND INSTRUMENTATION CAVITATION AND MULTIPHASE FLOW ADVANCES IN FLUIDS ENGINEERING EDUCATION MICROFLUIDICS, VOL 2　183-190　2012
Numerical Analysis of Influence of Acceleration on Cavitation Instabilities in Cascade Peer-reviewed

Yuka IGA, Tasuku KONNO

Proc. The 11th Asian International Conference on Fluid Machinery and The 3rd Fluid Power Technology Exhibition (AICFM-11)　2011/11/23
Advancement of Numerical Method for Cavitating Flow Around A Hydrofoil

Yuka IGA, Naoya OCHIAI, Wang GUOYU, Zhang MINDI, Huang BIAO

Proc. Eighth International Conference on Flow Dynamics, IFS Collaborative Research Forum (AFI/TFI-2011)　2011/11/10
Numerical Analysis of Nonspherical Bubble Collapse Behavior and Induced Impulsive Pressure during First and Second Collapse near the Wall Boundary Peer-reviewed

Naoya OCHIAI, Yuka IGA, Motohiko NOHMI, Toshiaki IKOHAGI

Journal of Fluid Science and Technology　6　(6)　860-874　2011/08
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jfst.6.860 　

ISSN： 1880-5558

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Cavitation often involves an abrupt phase change phenomenon. This phenomenon causes cavitation erosion on the material surface. In particular, violent bubble collapse near the material surface causes severe erosion. Numerical simulation is a powerful approach by which to clarify the high-speed, complex bubble collapse behavior near the wall boundary. In the present study, numerical analysis of nonspherical bubble collapse behavior and induced impulsive pressure at several initial standoff distance from the wall boundary is performed using a locally homogeneous model of a gas-liquid two-phase medium. The second collapse is confirmed to be more violent than the first collapse, and a circular erosion pattern is predicted owing to a toroidal bubble collapse attached to the wall boundary at a certain standoff distance. The influence of the symmetry breaking of the initial spherical bubble shape on the collapse behavior is investigated, and the asymmetry is found to influence the second bubble collapse, especially the generation of the high impulsive pressure in the central area.
Numerical Analysis of Three Types of Cavitation Surge in Cascade Peer-reviewed

Yuka Iga, Kei Hashizume, Yoshiki Yoshida

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　133　(7)　071102-1-071102-13　2011/07

DOI： 10.1115/1.4003663 　

ISSN： 0098-2202
Thermodynamic Effect on Subsynchronous Rotating Cavitation and Surge Mode Oscillation in a Space Inducer Peer-reviewed

Yoshiki Yoshida, Hideaki Nanri, Kengo Kikuta, Yusuke Kazami, Yuka Iga, Toshiaki Ikohagi

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　133　(6)　2011/06

DOI： 10.1115/1.4004022 　

ISSN： 0098-2202
Mechanism of Propagation Direction of Rotating Cavitations in a Cascade Peer-reviewed

Yuka Iga, Yoshiki Yoshida

JOURNAL OF PROPULSION AND POWER　27　(3)　675-683　2011/05

DOI： 10.2514/1.49454 　

ISSN： 0748-4658
Investigation of deflector effect on cavitation in an axisymmetric gate slot by means of AE measurement Peer-reviewed

Masayuki Shintani, Anh Viet Truong, Yuka Iga, Toshiaki Ikohagi

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　77　(777)　1210-1218　2011

DOI： 10.1299/kikaib.77.1210 　

ISSN： 0387-5016
Numerical analysis of influence of pipe length on cavitation surge Peer-reviewed

Yuka Iga, Hayato Nishitanaka, Yoshida Yoshiki

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011　1　(D)　351-357　2011

DOI： 10.1115/AJK2011-06066 　
Numerical analysis of controlling cavitation instabilities in tandem cascades Peer-reviewed

Yuka Iga, Yoshiki Yoshida

Transactions of the Japan Society for Aeronautical and Space Sciences　54　(184)　137-143　2011

DOI： 10.2322/tjsass.54.137 　

ISSN： 0549-3811
風洞実験によるオオオナモミの風耐性における力学的性質の解析

長嶋寿江, 太田福雄, 伊賀由佳, 彦坂幸毅

日本生態学会第58回大会講演論文集, 札幌(2011.3.8-12)　2011
Numerical Analysis of Influence of Gravity on Cavitation Instabilities in Cascade Peer-reviewed

IGA Yuka

Proc. The 11th Asian International Conference on Fluid Machinery and The 3rd Fluid Power Technology Exhibition (AICFM-11), Chennai India (2011), Paper No. AICFM11_AT_012. (pp. 8 pages)　2011
Study of Droplet Impingiment Phenomena by Fluid/Solid Coupled Simulation

H. Sasaki, Y. Iga, T. Ikohagi

Proc. SNA+MC2010　2010/10
Numerical Prediction of Cavitation Erosion Intensity in Cavitating Flows around a Clark Y 11.7% Hydrofoil Peer-reviewed

N. Ochiai, Y. Iga, M. Nohmi, T. Ikohagi

Journal of Fluid Science and Technology, Trans. JSME　5　(3)　416-431　2010/08
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jfst.5.416 　

ISSN： 1880-5558

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A numerical prediction method of cavitation erosion is proposed. In this method, the analysis of bubbles in cavitating flows is performed and the intensity of cavitation erosion is evaluated by the impact pressure induced by spherical bubble collapse. In the present study, two-dimensional cavitating flow around the Clark Y 11.7 % hydrofoil is used to examine the proposed numerical prediction method. The proposed numerical method predicts that the intensities of cavitation erosion in noncavitating, attached cavitating and pseudo-supercavitating flows are far weaker than the intensity of cavitation erosion in a transient cavitating flow, and the intensity in the vicinity of the sheet cavity termination is high. These results correspond well to experimental results, and it is confirmed that systematic erosion characteristics are generally captured by this method. Furthermore, the velocity dependence of cavitation erosion is examined, and it is found that the exponent n in the relation between the intensity I and main flow velocity U_in (I ∝ U_inⁿ) becomes large when the bubble radius is large and ranges between 4.3 and 7.0 in the present study. According to the bubble dynamics, the ambient pressure and the rate of increases in pressure increase as the main flow velocity, and the maximum internal pressure increase. Therefore, it is thought that smaller bubbles cause cavitation erosion when the main flow velocity is large.
キャビテーションモデル改善のための一提案 Peer-reviewed

能見基彦, 落合直哉, 伊賀由佳, 井小萩利明

ターボ機械　38　(8)　464-469　2010/08
Publisher: Turbomachinery Society of Japan
DOI： 10.11458/tsj.38.464 　

ISSN： 0385-8839

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Some issues about cavitation are discussed for improving cavitation model for CFD. Concerning the relatively large cavitation bubbles those are often observed in experiments, combination of grid scale bubbles：GSB and sub grid scale bubble model：SGSB are proposed. GSB shall be computed by using the computational scheme for free surface with phase change model. SGSB can be computed with conventional cavitation model. Breakup of GSB generates SGSB, and coalescence of SGSB makes GSB. Upper limit of void fraction of SGSB is estimated in the range of five or ten percent from the simple speculation of the structure of packed spheres. Two types of cavitation bubble inception model are also discussed. To verify the proposed concepts of cavitation model, a traveling bubble over a hydrofoil is computed by using free surface flow scheme of VOF approach. Computed results show qualitatively similar characteristics of bubble dynamics to those in experimental results.
水中翼周りのキャビテーションの詳細観察 Peer-reviewed

能見基彦, 落合直哉, 伊賀由佳, 井小萩利明

ターボ機械　38　(5)　307-312　2010/05
Publisher: Turbomachinery Society of Japan
DOI： 10.11458/tsj.38.307 　

ISSN： 0385-8839

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Cavitation of a hydrofoil is observed in detail by using a high speed video camera. Paint removal test is also carried out in order to evaluate cavitation aggressiveness for erosion. 2D hydrofoil profile is Clark Y 11.7% and its angle of attack is seven degrees. Cavitation number is σ=1.08. Experimental results are compared with cavitation CFD. Numerous features of unsteady cavitation are observed such as cyclic fluctuation of sheet cavity, existence of glassy cones on a sheet cavity, generation of cloud cavitation from sheet cavity and isolated bubbles traveling over suction surface of the blade. Isolated traveling bubbles and their collapses are thought to be one of the main causes of severe paint removals. Isolated traveling bubbles are derived from flowing cavitation nucleus or from abrupt generation at the leading edge of the blade. Some important factors of computation are clarified for the modification of cavitation CFD.
Numerical Analysis of Control of Cavitation Instabilities in Tandem Cascade

Y. Iga, Y. Yoshida

Proc. Asian Joint Conference on Propulsion and Power 2010 (AJCPP2010)　2010/03
Influence of thermodynamic effect on sub-synchronous rotating cavitation and surge mode oscillation Peer-reviewed

Yoshiki Yoshida, Hideaki Nanri, Kengo Kikuta, Yusuke Kazami, Yuka Iga, Toshiaki Ikohagi

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　76　(762)　179-185　2010
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.76.762_179 　

ISSN： 0387-5016
A DETAILED OBSERVATION OF HYDROFOIL CAVITATION AND A PROPOSAL FOR IMPROVING CAVITATION MODEL

Motohiko Nohmi, Naoya Ochiai, Yuka Iga, Toshiaki Ikohagi

PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER CONFERENCE - 2010, VOL 2　19-27　2010

DOI： 10.1115/FEDSM-ICNMM2010-30435 　
非定常キャビテーション流れ解析における境界条件の影響

能見基彦, 井小萩利明, 伊賀由佳

第15回キャビテーションに関するシンポジウム講演論文集, 大阪(2010.11.22-23 (23))　2010
壁面近傍での非球状気泡崩壊挙動に関する一考察

落合直哉, 伊賀由佳, 能見基彦, 井小萩利明

日本機械学会流体工学部門講演会講演論文集, 山形(2010.10.30-31), 講演番号0406　2010
壁面近傍での非球状気泡崩壊と誘起衝撃圧の数値解析

落合直哉, 伊賀由佳, 能見基彦, 井小萩利明

日本機械学会東北支部第45期総会講演会講演論文集, 仙台(2010.3.12）, No.2010-1, 講演No.204, 208-209頁　2010
Numerical Analysis of First and Second Collapse Behavior of a Bubble near Wall Boundary

Naoya OCHIAI, Yuka IGA, Motohiko NOHMI, Toshiaki IKOHAGI

Proc. The 7th International Conference on Flow Dynamics (ICFD2010), Sendai (2010), pp. 546-547.　2010
Occurrence Mechanism and Oscillation Characteristics of Pulsation Phenomenon Arising in Cavitation Surge in Cascade Peer-reviewed

Y. Iga, K. Hashizume, Y. Yoshida, T. Ikohagi

Journal of Environment and Engineering　4　(3)　524-538　2009/12
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jee.4.524 　

ISSN： 1880-988X

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In this study, numerical analysis of cavitating three-blade cyclic flat-plate cascade is performed with paying attention to cavitation surge which is a type of cavitation instabilities. A numerical method employing "locally homogeneous model for compressible gas-liquid two-phase medium" is applied to solve the unsteady cavitating flowfield. From results of numerical analysis, few typical tendency of cavitation surge which is well known in experiments was reproduced numericaly, that frequency of cavitation surge decreases with lowering σ, and that cavitation surge is easy to occur at low flow rate condition. Additionaly, mechanism of pulsation phenomenon of cavitation surge in flat-plate cascade was clarified, that collapse pressure of cloud cavity in downstream of cascade propagates upstream on contact with re-entrant jet which is flowing backward inside a sheet cavity and causes oscillation in upstream pressure, also that negative angle of attack and choking of cascade throat are considered to cause of oscillation in flow rate. About dynamic transfer function of cavitation, certain degree of possibility is confirmed in quasi-steady mass flow gain factor M_quasi and cavitation compliance K_quasi for prediction of occurrence limit of cavitation instabilities. Additionally, for prediction of frequency of cavitation surge, it was confirmed that local cavitation compliance K_local is more available than quasi-steady one.
熱力学的効果が亜同期旋回キャビテーションに与える影響

吉田義樹, 南里秀明, 菊田研吾, 風見佑介, 伊賀由佳, 井小萩利明

宇宙航空研究開発機構研究開発資料　JAXA-RM09　(005)　1-8　2009/12
Influence of Inlet and Outlet Pipe Length on Cavitation Surge

Y. Iga, Y. Yoshida, T. Ikohagi

Proc. 9th International Symposium on Advanced Fluid Information and 6th International Symposium on Transdisciplinary Fluid Integration　126-127　2009/11
Numerical Analysis of Turbulent Cavitation Around a Hydrofoil

G. Yamamoto, Y. Iga, M. Nohmi, T. Ikohagi

Proc. The 6th International Conference on Flow Dynamics　588-589　2009/11
Numerical Investigation of Thermodynamic Effect on Unsteady Cavitation in Cascade Peer-reviewed

Y. Iga, N. Ochiai, Y. Yoshida, T. Ikohagi

Proc. The 7th International Symposium on Cavitation　2009/08
Numerical Prediction of Cavitation Erosion in Cavitating Flow Peer-reviewed

N. Ochiai, Y. Iga, M. Nohmi, T. Ikohagi

Proc. The 7th International Symposium on Cavitation　2009/08
A STUDY OF PROGPAGATING SPEED OF ROTATING CAVITATION BASED ON NUMERICAL ANALYSIS Peer-reviewed

Yuka Iga, Yoshiki Yoshida

PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER CONFERENCE, VOL 1, PTS A-C　399-405　2009

DOI： 10.1115/FEDSM2009-78411 　
THERMODYNAMIC EFFECT ON SUB-SYNCHRONOUS ROTATING CAVITATION AND SURGE MODE OSCILLATION IN A SPACE INDUCER Peer-reviewed

Yoshiki Yoshida, Hideaki Nanri, Kengo Kikuta, Yusuke Kazami, Yuka Iga, Toshiaki Ikohagi

PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER CONFERENCE, VOL 1, PTS A-C　121-129　2009

DOI： 10.1115/FEDSM2009-78102 　
熱力学的効果が亜同期旋回キャビテーションに与える影響

風見佑介, 伊賀由佳, 吉田義樹, 渡邉光男, 島垣満, 井小萩利明

第14回キャビテーションに関するシンポジウム講演論文集, 仙台(2009.3.19-20(20)), 特別企画I-4, 全4頁　2009
ＲＡＮＳ／ＬＥＳハイブリッドモデルを用いたキャビテーション乱流の数値解析

山本元貴, 伊賀由佳, 能見基彦, 井小萩利明

日本機械学会2009年度年次大会講演論文集, 盛岡(2009.9.16), No.09-1 Vol72, 39-40頁　2009
水中翼周りのキャビテーションの詳細観察

能見基彦, 井小萩利明, 伊賀由佳, 落合直哉

第60回タ−ボ機械協会総会講演会講演論文集, 東京(2009.9.25), 43-48頁　2009
蒸気泡の挙動に及ぼす液温の影響に関する数値解析

ファドヒルサムシール, 落合直哉, 伊賀由佳, 能見基彦, 井小萩利明

第14回キャビテーションに関するシンポジウム講演論文集, 仙台(2009.3.19-20(20)), No. A3-1, 全4頁　2009
キャビテーションエロージョンの数値予測法の研究

落合直哉, 伊賀由佳, 能見基彦, 井小萩利明

第14回キャビテーションに関するシンポジウム講演論文集, 仙台(2009.3.19-20(19)), No.A2-2, 全4頁　2009
旋回キャビテーションの発生メカニズムに関する一提案

伊賀由佳, 吉田義樹, 井小萩利明

第14回キャビテーションに関するシンポジウム講演論文集, 仙台(2009.3.19-20(20)), 1-4頁　2009
NUMERICAL PREDICTION METHOD OF CAVITATION EROSION Peer-reviewed

Motohiko Nohmi, Toshiaki Ikohagi, Yuka Iga

PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER CONFERENCE -2008, VOL 1, PT A AND B　1139-1145　2009
インデューサに発生する旋回キャビテーションの熱力学的効果

吉田義樹, 笹尾好史, 渡邉光男, 橋本知之, 伊賀由佳, 井小萩利明

宇宙航空研究開発機構研究開発資料　JAXA-RM-08　(004)　1-10　2008/11
インデューサに発生する旋回キャビテーションの熱力学的効果 Peer-reviewed

吉田義樹, 笹尾好史, 渡邉光男, 橋本知之, 伊賀由佳, 井小萩利明

日本機械学会論文集 (B編)　74　(746)　2091-2098　2008/10

DOI： 10.1299/kikaib.74.2091 　
同期旋回キャビテーション初生時のキャビティ不均一長さと軸振動の相互関係

吉田義樹, 永浦克司, 風見佑介, 島垣満, 伊賀由佳, 井小萩利明

宇宙航空研究開発機構研究開発資料　JAXA-RM-08　(002)　1-11　2008/08
Numerical Analysis of Cavitation Instabilities and the Suppression in Cascade Peer-reviewed

Yuka IGA, Makoto HIRANUMA, Yoshiki YOSHIDA, Toshiaki IKOHAGI

Journal of Environment and Engineering　3　(2)　240-249　2008/06
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jee.3.240 　

ISSN： 1880-988X

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In this study, unsteady cavitation and cavitation instabilities are numerically analyzed around flat-plate cascade with three blades cyclic condition in water/air working fluid. The numerical method employing an original model "locally homogeneous model of compressible gas-liquid two-phase medium" is applied to numerical simulation. The method can simply treat the entire flow field inside and outside the cavity by one system equations. As a result of numerical analysis, occurrence and oscillation characteristics of three types of cavitation instabilities are reproduced, which are "cavitation surge", "super-synchronous rotating cavitation" and "rotating-stall cavitation". Additionally, flow fields around flat-plate cascade with slits on blades are analyzed in the conditions where the cavitation instabilities arise in the cascade without slit. Consequently, the suppression effect of the slit on the cavitation instabilities is confirmed.
ＪＡＸＡ極低温インデューサ試験結果の概説

吉田義樹, 渡邉光男, 長谷川敏, 橋本知之, 島垣満, 木村俊哉, 永浦克司, 菊田研吾, 笹尾好史, 風見佑介, 伊賀由佳, 井小萩利明, 加藤洋治, 渡邉聡

タ－ボ機械　36　(6)　1-11　2008/06
翼列に発生するキャビテーション不安定現象とその制御に関する数値解析 Peer-reviewed

伊賀由佳, 平沼誠, 吉田義樹, 井小萩利明

日本機械学会論文集 (B編)　74　(741)　1058-1067　2008/05
Occurrence mechanism and oscillation characteristics of pulsation phenomenon arising in cavitation surge in cascade

Yuka Iga, Kei Hashizume, Yoshiki Yoshida, Toshiaki Ikohagi

Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　74　(5)　1058-1067　2008
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.74.1058 　

ISSN： 0387-5016
1721 Introduction of Cryogenic Cavitation Tunnel in JAXA

NIIYAMA Kazuki, HASEGAWA Satoshi, YOSHIDA Yoshiki, IGA Yuka, OHIRA Katsuhide, IKOHAGI Toshiaki

The proceedings of the JSME annual meeting　2008　81-82　2008
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2008.2.0_81 　

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New cryogenic cavitation tunnel was constructed in the JAXA Kakuda Space Center in March 2008. The tunnel will be used for an elucidation on thermodynamic effect which affects on the growth of cavitation. Liquid nitrogen is used as the working fluid, and the temperature of the working fluid can be varied in order to change the degree of thermodynamic effect on cavitation. The obtained results will contribute to the improvement of the performance of rocket turbopumps.
1717 Three Kinds of Surging Oscillation in Cavitating Cascade

IGA Yuka, HASHIZUME Kei, YOSHIDA Yoshiki, IKOHAGI Toshiaki

The proceedings of the JSME annual meeting　2008　73-74　2008
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2008.2.0_73 　

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Unsteady cavitation occurring in turbopump sometimes yields unstable oscillation in the pump which is called as cavitation instabilities. In this study, cavitation surge accompanied by pulsation phenomenon which is classified into axial directional instability is numerically analyzed in cascade by using a numerical method based on our original gas-liquid two-phase model. As a result, three kinds of surging oscillation having different characteristics are reproduced in the present cascade, and the mechanism is analyzed.
Interaction between uneven cavity length and shaft vibration at the inception of synchronous rotating cavitation Peer-reviewed

Yoshiki Yoshida, Y. Kazami, K. Nagaura, M. Shimagaki, Y. Iga, T. Ikohagi

International Journal of Rotating Machinery　2008　(20140)　1-7　2008

DOI： 10.1155/2008/218978 　

ISSN： 1023-621X 1542-3034
キャビテーション流れ中の気泡挙動解析と壊食性予測

落合直哉, 伊賀由佳, 能見基彦, 井小萩利明

混相流学会年次大会2008 講演論文集, 会津(2008.8.10), 260-261頁　2008
ＪＡＸＡ極低温キャビテーションタンネルの紹介

新井山一樹, 長谷川敏, 吉田義樹, 伊賀由佳, 大平勝秀, 井小萩利明

日本機械学会2008年度年次大会講演論文集, 横浜(2008.8.3-7), No.08-1 Vol.2, 81-82頁　2008
数値解析によるキャビテーション壊食予測技術の開発

能見基彦, 井小萩利明, 伊賀由佳

第59回タ−ボ機械協会総会講演会講演論文集, 東京(2008.5.16), 49-54頁　49-54　2008
熱力学的効果の差異による同期旋回キャビテーションの様相の違い

吉田義樹, 永浦克司, 風見佑介, 笹尾好史, 伊賀由佳, 井小萩利明

第59回タ−ボ機械協会総会講演会講演論文集, 東京(2008.5.16), 55-60頁　2008
同期旋回キャビテーションのサージ的振動

風見佑介, 伊賀由佳, 橋本知之, 島垣満, 吉田義樹, 井小萩利明

日本機械学会東北支部第43期総会講演会講演論文集, 仙台(2008.3.15）, No.2008-1, 講演No. 200, pp. 201-202　2008
翼列のキャビテーション不安定現象に及ぼす加速度場の影響に関する数値解析

伊賀由佳, 金野佑

日本機械学会2011年度年次大会, 東京(2011.9.11-15), No.J051043　2008
翼列キャビテーション流れにおける三種のサージ的振動

伊賀由佳, 橋爪圭, 吉田義樹, 井小萩利明

日本機械学会2008年度年次大会講演論文集, 横浜(2008.8.3-7), No.08-1 Vol.2, 73-74頁　2008
A Fluid/Material Coupled Analysis of Liquid Droplet Impact

Yusuke AOKI, Yuka IGA, Toshiaki IKOHAGI

Proc. 8th International Symposium on Advanced Fluid Information and 5th International Symposium on Trasdisciplinary Fluid Integration (AFI/TFI 2008), Sendai, (2008), pp.82-83 (Poster).　2008
Influence of Inlet Pipe Length on Cavitation Instabilities in Cascade

Key HASHIZUME, Yuka IGA, Yoshiki YOSHIDA, Toshiaki IKOHAGI

Proc. The Seventh JSME-KSME Thermal and Fluids Engineering Conference (TFEC7), Hokkaido (2008). Paper No. G142.　2008
翼列キャビテーションサージの振動特性と脈動現象発生機構の解明 Peer-reviewed

伊賀由佳, 橋爪圭, 吉田義樹, 井小萩利明

日本機械学会論文集 (B編), Vol. 74, No. 741 (2008), 1058-1067頁.　2008
楔形液柱の固体表面への高速衝突現象の数値解析 Peer-reviewed

新保健太郎, 芝田篤史, 伊賀由佳, 井小萩利明

東北大学流体科学研究所報告　18　17-24　2007/12/21
Publisher:
ISSN： 0916-2860
Numerical Analysis of Internal Flow in Turbopump Inducer Using Gas-Liquid Homogeneous Model

Onozawa, M, Iga, Y, Kimura, T, Ikohagi, T

Proc. 7th International Symposium on Advanced Fluid Information and 4th International Symposium on Trasdisciplinary Fluid Integration　260-263　2007/12/14
Propagating Behavior of Elastic Waves in Soliod Caused by Bubble Collapse

Shinbo, K, Iga, Y, Nohmi, M, Ikohagi, T

Proc. 7th International Symposium on Advanced Fluid Information and 4th International Symposium on Trasdisciplinary Fluid Integration　256-259　2007/12/14
Numerical Analysis of Pressure Propagation and Oscillating Characteristics of Cavitation Surge in Cascade Peer-reviewed

Yuka IGA, Kei Kawai, Yoshiki Yoshida, Toshiaki Ikohagi

Proc. The 9th ASIAN International Conference on Fluid Machinery　AICFM9　(241)　1-7　2007/10/16
Numerical Analysis of Erosive -Bubble Behavior in Cavitating Flow Peer-reviewed

Naoya OCHIAI, Yuka IGA, Motohiko NOHMI, Toshiaki IKOHAGI

Proc. The 9th ASIAN International Conference on Fluid Machinery　AICFM9　(174)　1-7　2007/10/16
翼列のキャビテーション流れにおける熱力学的効果の数値解析

伊賀由佳, 吉田義樹, 井小萩利明

日本機械学会2007年度年次大会講演論文集　07-1　(Ⅱ)　235-236　2007/09
同期旋回キャビテーション初生時のキャビティの挙動

風見佑介, 橋本知之, 島垣満, 伊賀由佳, 井小萩利明

日本機械学会2007年度年次大会講演論文集　07-1　(Ⅱ)　231-232　2007/09
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2007.2.0_231 　

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Synchronous rotating cavitation (SRC) is known as one of some cavitation instabilities. To investigate aspects of SRC, we examined the cavity length and fluid force at the inception of SRC. It was found that the estimated fluid force caused by the unevenness of cavity length increase exponentially. The behavior of shaft vibration has strong correlation with that of fluid force.
JAXA極低温インデュ－サ試験結果の概説

吉田義樹, 渡邊光男, 長谷川敏, 橋本知之, 島垣満, 木村俊哉, 永浦克司, 菊田研吾, 笹尾好史, 伊賀由佳, 井小萩利明, 加藤洋治, 渡邉聡

第５７回タ－ボ機械協会総会講演会講演論文集　1-6　2007/05/18
極低温流体中でインデューサに発生する旋回キャビテーションの挙動

笹尾好史, 風見佑介, 吉田義樹, 井小萩利明, 伊賀由佳

日本機械学会東北支部第42期総会講演会講演論文集　2007　(1)　193-194　2007/03/13
Publisher: The Japan Society of Mechanical Engineers
Thermodynamic effect on rotating cavitation in an inducer

Yoshiki Yoshida, Yoshifumi Sasao, Mitsuo Watanabe, Tomoyuki Hashimoto, Yuka Iga, Toshiaki Ikohagi

FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT ASME/JSME FLUIDS ENGINEERING SUMMER CONFERENCE, VOL 2, PTS A AND B　423-429　2007
Thermodynamic effect on rotating cavitation in an inducer Peer-reviewed

Yoshiki Yoshida, Yoshifumi Sasao, Mitsuo Watanabe, Tomoyuki Hashimoto, Yuka Iga, Toshiaki Ikohagi

FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT ASME/JSME FLUIDS ENGINEERING SUMMER CONFERENCE, VOL 2, PTS A AND B　FEDSM2007　(37468)　423-429　2007
Thermodynamic effect on rotating cavitation in an inducer Peer-reviewed

Yoshiki Yoshida, Yoshifumi Sasao, Mitsuo Watanabe, Tomoyuki Hashimoto, Yuka Iga, Toshiaki Ikohagi

FEDSM 2007: PROCEEDINGS OF THE 5TH JOINT ASME/JSME FLUIDS ENGINEERING SUMMER CONFERENCE, VOL 2, PTS A AND B　131　423-429　2007

DOI： 10.1115/1.3192135 　
Numerical Analysis of Cavitation Instabilities and the Suppression in Cascade Peer-reviewed

伊賀由佳, 平沼誠, 吉田義樹, 井小萩利明

日本機械学会論文集　72　(719)　115-121　2006/07

DOI： 10.1299/kikaib.72.1759 　
Numerical Analysis About Suppression Effect of Tandem Cascade on Cavitation Instabilities Peer-reviewed

Makoto HIRANUMA, Yuka IGA, Yoshiki YOSHIDA, Toshiaki IKOHAGI

Proc. 11th International Symposium on Transport Phenomena and Dynamics of　ISROMAC11-PAPER55　2006/02
2438 Investigation of Uneven Cavity Length under the Synchronous Rotating Cavitation

YOSHIDA Yoshiki, OKITA Koichi, SASAO Yoshifumi, HASEGAWA Satoshi, SHIMAGAKI Mitsuru, NAKAMURA Noriaki, IGA Yuka

The proceedings of the JSME annual meeting　2006　195-196　2006
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2006.2.0_195 　

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Synchronous rotating cavitation is known as one type of some cavitation instability, which causes shaft vibration or head loss. The cavitation instabilities are affected by interference of the tip leakage vortex catitation with adjacent blade. In the present study, we focused on the influences of the inducer configuration on synchronous rotating cavitation with two different inducers. It was found that unevenness of the cavity length differs by the configuration of the inducer. In addition, we estimated fluid force to evaluate the degree of hydraulic force acting on the inducer. The fluid force increased rapidly at the onset of synchronous rotating cavitation.
二段翼列まわりのキャビテーション流れの流動特性に関する数値解析

平沼誠, 伊賀由佳, 井小萩利明

第５５回理論応用力学講演会講演論文集　101-102　2006/01

DOI： 10.11345/japannctam.55.0.36.0 　
キャビテーションサージの振動特性に関する数値解析

川合啓, 伊賀由佳, 井小萩利明

日本機械学会2006年度年次大会講演論文集, 熊本(2006.9), No.06-1 Vol.?, 205-206頁　2006
Numerical Study of Unstable Cavitation Phenomena Arising in Tandem Cascade Peer-reviewed

Yuka IGA, Makoto HIRANUMA, Takashi SHIMURA, Toshiaki IKOHAGI

Proc. The 8th ASIAN International Conference on Fluid Machinery　650-664　2005/10
Numerical study of cavitation instabilities arising in cascade with slit Peer-reviewed

Yuka Iga, Makoto Hiranuma, Takashi Shimura, Toshiaki Ikohagi

PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER CONFERENCE - 2005, VOL 1, PTS A AND B　FEDSM2005-77299　1265-1271　2005

DOI： 10.1115/FEDSM2005-77299 　
Numerical analysis of cavitation instabilities arising in the three-blade cascade Peer-reviewed

Y Iga, M Nohml, A Goto, T Ikohagi

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　126　(3)　419-429　2004/05

DOI： 10.1115/1.1760539 　

ISSN： 0098-2202
遠心ポンプキャビテーションの詳細計測とCFD

能見基彦, 後藤彰, 伊賀由佳, 井小萩利明, 江口崇, 古川明徳

第12回キャビテーションに関するシンポジウム講演論文集　139-142　2004/03
遠心ポンプキャビテーションの実験と流れ解析 Peer-reviewed

能見基彦, 後藤彰, 勝俣辰善, 伊賀由佳, 井小萩利明

エバラ時報　204　(204)　3-7　2004
Publisher:
ISSN： 0385-3004
大型計算機を用いたキャビテーション流れ解析の現状（総論）

井小萩利明, 伊賀由佳

フルードパワーシステム　35　(3)　23-27　2004
Numerical study of sheet cavitation breakoff phenomenon on a cascade hydrofoil Peer-reviewed

Y Iga, M Nohmi, A Goto, BR Shin, T Ikohagi

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　125　(4)　643-651　2003/07

DOI： 10.1115/1.1596239 　

ISSN： 0098-2202
Experimental and Numerical Study of Cavitation Breakdown in a Centrifugal Pump Peer-reviewed

Motohiko NOHMI, Akira GOTO, Yuka IGA, Toshiaki IKOHAGI

Proc. The 2003 Joint ASME-JSME Fluids Engineering Summer Conference　2002　FEDSM2003-45409-190　2003
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2002.3.0_189 　

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The cavitation flow in a low specific speed centrifugal pump was measured in detail. Eighteen Pressure transducers were installed in impeller vanes and unsteady pressure distribution over pressure side and suction side were captured. Cavitation characteristic was easily photographed in axial direction through transparent inlet volute casing and front shroud. At the BEP flow rate bubble cavitaion increases along the suction side while decreasing the NPSH. When bubble cavitation reaches the throat, wedge-like cavity appears at the pressure side and the head breakdown occurs steeply. At the high flow rate, wedge like cavity appears incipiently at the pressure side of the throat and head drops gradually. Single phase CFD shows good agreement with measured results at high NPSH.
遠心ポンプのキャビテーション流れ解析

能見基彦, 後藤彰, 伊賀由佳, 井小萩利明

日本機械学会流体工学部門講演会講演論文集　2003
Cavitation CFD in a Centrifugal Pump

Motohiko NOHMI, Akira GOTO, Yuka IGA, Toshiaki IKOHAGI

Proc. Fifth International Symposium on Cavitation　2003　(78)　Cav03-OS-4-010-49"-"9-50"　2003
Publisher: The Japan Society of Mechanical Engineers

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This paper discribes about theoritical analyses of cavitation in centrifugal pump. A linear stability analysis is carried out by using the singularity method based on a closed cavity model allowing the cavity length freely to change. For 4 bladed impeller, a mode corresponding to the transition to alternate blade cavitation was examined. For 5 bladed impeller, various kind of rotating cavitation was found.
Numerical Analysis of Unstable Phenomena of Cavitation in Cascade with Finite Blade Numbers Peer-reviewed

Yuka IGA, Motohiko NOHMI, Akira GOTO, Byeong Rog SHIN, Toshiaki IKOHAGI

Proc. 9th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery　FD-ABS-128　2002/02
Numerical Analysis of Cavitation Instabilities arising in Three Blade Cascade

IGA Yuka, NOHMI Motohiko, GOTO Akira, IKOHAGI Toshiaki

The proceedings of the JSME annual meeting　2002　133-134　2002
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2002.3.0_133 　

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Unstable cavitating flow phenomena through three-blade cascade, which is similar to the rotating cavitation occurring in turbomachinery, are simulated numerically. A numerical method employing a locally homogeneous model of compressible gas-liquid two-phase medium is applied to solve above cavitating flowfields. Since the present method permits us to treat rather simply the whole flow fields inside and outside the cavity, it is possible to macroscopically analyze unsteady phenomenon with a long time evolution. From calculated results, we get a cavitation characteristics curve of the cascade, and discuss an aspect of propagation of uneven cavitation.
３枚羽根翼列内部に発生するキャビテーション不安定現象の数値解析

伊賀由佳, 能見基彦, 後藤彰, 井小萩利明

日本機械学会2002年度年次大会講演論文集　No.02-1　(Vol.Ⅲ)　133-134　2002
遠心ポンプ・キャビテーション揚程低下の実験的研究

能見基彦, 後藤彰, 伊賀由佳, 井小萩利明

日本機械学会2002年度年次大会講演論文集　No.02-1　(Vol.Ⅲ)　189-190　2002
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2002.3.0_189 　

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The cavitation flow in a low specific speed centrifugal pump was measured in detail. Eighteen Pressure transducers were installed in impeller vanes and unsteady pressure distribution over pressure side and suction side were captured. Cavitation characteristic was easily photographed in axial direction through transparent inlet volute casing and front shroud. At the BEP flow rate bubble cavitaion increases along the suction side while decreasing the NPSH. When bubble cavitation reaches the throat, wedge-like cavity appears at the pressure side and the head breakdown occurs steeply. At the high flow rate, wedge like cavity appears incipiently at the pressure side of the throat and head drops gradually. Single phase CFD shows good agreement with measured results at high NPSH.
Numerical analysis of 2-D unsteady cavitating flow around hydrofoils in cascade Peer-reviewed

Yuka Iga, Motohiko Nohmi, Akira Goto, Byeong Rog Shin, Toshiaki Ikohagi

Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B　68　(666)　368-374　2002
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/kikaib.68.368 　

ISSN： 0387-5016
Preconditioned Numerical Method for Gas-Liquid Two-Phase Flow

Yuka IGA, Yoshinori SAITO, Byeong Rog SHIN, Toshiaki IKOHAGI

第15回数値流体力学シンポジウム講演論文集　D09-3　2001/12
Numerical Study of Sheet Cavitation Break-off Phenomenon on a Cascade Hydrofoil

Yuka IGA, Motohiko NOHMI, Akira GOTO, Byeong Rog SHIN, Toshiaki IKOHAGI

Proc. Fourth International Symposium on Cavitation　2001/06
Numerical analysis of cavitating flow through a 2-D decelerating cascade Peer-reviewed

BR Shin, Y Iga, T Ikohagi

COMPUTATIONAL FLUID DYNAMICS 2000　651-656　2001
Numarical Visualization of Instability Phenomena arising in Cavitating Cascade Flow

Yuka IGA, Byeong Rog SHIN, Toshiaki IKOHAGI

Proc. First International Symposium on Advanced Fluid Information　257-262　2001
有限枚数翼列翼形まわりの非定常キャビテーション流れの数値解析

伊賀由佳, 能見基彦, 後藤彰, 申炳録, 井小萩利明

第11回キャビテーションに関するシンポジウム講演論文集　133-136　2001
翼列まわりの二次元非定常キャビテーション流れの数値解析

伊賀由佳, 能見基彦, 後藤彰, 申炳録, 井小萩利明

日本機械学会流体工学部門講演会講演論文集　No.00-14　Os13-1305　2000
翼列まわりの非定常キャビテーション流れの数値解析

伊賀由佳, 申炳録, 井小萩利明

第10回キャビテーションに関するシンポジウム講演論文集　55-58　1999

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Misc. 12

水素キャビテーションの内部温度計測手法の開発

岡島淳之介, 江口暢, 大平隆, 守谷修一, 坂本勇樹, 伊賀由佳

ターボ機械協会講演会(CD-ROM)　89th　2023
Clarification of the Transition Mechanism of Cavitation Instabilities

姜東赫, 伊賀由佳

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(CD-ROM)　2020　2021
Clarification of the transition mechanism of cavitation instabilities

姜東赫, 伊賀由佳

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(CD-ROM)　2021　2021
翼端漏れ渦キャビテーションの熱力学的効果

姜東赫, 伊賀由佳

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研究拠点活動報告書　2015　2017
機械工学年鑑，7. 流体工学

西山秀哉, 福西祐, 伊澤精一郎, 浅井圭介, 澤田恵介, 孫明宇, 祖山均, 石本淳, 山本悟, 伊賀由佳, 須藤誠一, 中野政身, 佐藤岳彦, 高奈秀匡, 徳増崇, 米村茂, 早瀬敏幸, 石川拓司

日本機械学会誌　118　(1161)　27-33　2015/08/05
Publisher: 日本機械学会
Numerical Simulation of Cavitation Instabilities

42　(12)　737-749　2014/12
Publisher: 日本工業出版
ISSN： 0385-8839
0406 A Study of Nonspherical Bubble Collapse Behavior near Wall Boundary

OCHIAI Naoya, IGA Yuka, NOHMI Motohiko, IKOHAGI Toshiaki

Fluids engineering conference ...　2010　131-132　2010/10/29
Publisher: The Japan Society of Mechanical Engineers
ISSN： 1348-2882

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Collapsing bubble near wall boundary is numerically analyzed to clarify the mechanism of cavitation bubble collapse and develop numerical prediction method of cavitation erosion. 2D axisymmetric and 3D plane-symmetric calculations using a locally homogeneous model of gas-liquid two-phase medium are performed until the second bubble collapse. It is confirmed that microjet generation, propagation of induced pressure wave and collapse of torus bubble can be realized and that the second collapse is responsible for the intensity of cavitation erosion. It is also found that the collapse of slightly asymmetric bubble from spherical bubble causes the different distribution of maximum impact pressure.
Thermodynamic Effect on Rotating Cavitation in an Inducer

Yoshiki Yoshida, Yoshifumi Sasao, Mitsuo Watanabe, Tomoyuki Hashimoto, Yuka Iga, Toshiaki Ikohagi

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME　131　(9)　091302-1-091302-7　2009/09

DOI： 10.1115/1.3192135 　

ISSN： 0098-2202
200 Switch of Alternate Blade Cavitation in Four Bladed Inducer

NAGAURA Katsuji, KAZAMI Yuusuke, YOSHIDA Yoshiki, MIZUNO Tsutomu, IGA Yuka, IKOHAGI Toshiaki

2009　(44)　192-193　2009/03/13
Publisher: The Japan Society of Mechanical Engineers
200 Surge Mode Oscillation under the Synchronous Rotating Cavitation

KAZAMI Yusuke, IGA Yuka, HASHIMOTO Tomoyuki, SHIMAGAKI Mitsuru, YOSHIDA Yoshiki, IKOHAGI Toshiaki

2008　(43)　201-202　2008/03/15
Publisher: The Japan Society of Mechanical Engineers
JAXA極低温インデューサ試験結果の概説

吉田義樹, 渡邉光男, 長谷川敏, 橋本知之, 島垣満, 木村俊哉, 永浦克司, 菊田研吾, 笹尾好史, 風見佑介, 伊賀由佳, 井小萩利明, 加藤洋治, 渡邉聡

ターボ機械　36　(6)　321-331　2008
Publisher: 日本工業出版
ISSN： 0385-8839
同期旋回キャビテーション初生時のキャビティ不均一長さと軸振動の相互関係

吉田義樹, 永浦克司, 風見佑介, 島垣満, 伊賀由佳, 井小萩利明

ターボ機械　36　(8)　465-472　2008

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Presentations 236

Transition from attached cavitation to nucleate boiling on heated NACA0015 hydrofoil

Ning Yang, Junnosuke Okajima, Yuka Iga

12th International Cavitation Symposium (CAV2024)　2024/06/03
Experimental Study of Turbulent Thermodynamic Parameter by Internal Temperature Measurement in Hot Water Cavitation

Shuichi. Ichiki, Junnosuke Okajima, Yuka Iga

12th International Cavitation Symposium (CAV2024)　2024/06/03
Oscillation Characteristics of Tip Leakage Vortex Cavitation Arising in a Twisted Hydrofoil with Tip Clearance

Koki Tamura, Yuka Iga

12th International Cavitation Symposium (CAV2024)　2024/06/03
インデューサに発生する旋回キャビテーションの現象解明に向けた多点圧力計測

池田和樹, 奈倉悠人, 川崎聡, 伊賀由佳

第90回ターボ機械協会総会講演会　2024/05/17
Observation of Superposition of Cavitation Instability in Liquid Rocket Inducer by Multi-point Pressure Measurement

Sota Harada, Yuto Nakura, Koki Tamura, Satoshi Kawasaki, Yuka Iga

The 8th International conference on Pumps and Fans (ICPF2024)　2024/04/13
Numerical Analysis of Oscillation Characteristic of Cavitation in Liquid Rocket Inducer with Several Suppression Methods

Takuo Mino, Koki Tamura, Satoshi Kawasaki, Yuka Iga

The 8th International conference on Pumps and Fans (ICPF2024)　2024/04/13
Numerical Analysis of Cavitation Instabilities arising in Cascade by using Compressible Gas-liquid Homogeneous Model Invited

Yuka Iga

The 8th International conference on Pumps and Fans (ICPF2024)　2024/04/14
熱力学的自己抑制効果評価のための非定常キャビテーション温度推定手法

岡島淳之介, 江口暢, 伊賀由佳

キャビテーションに関するシンポジウム(第21回)　2023/12/08
高温水キャビテーションの内部温度計測による乱流熱力学的パラメータの実験的検証

市来秀一, 岡島淳之介, 伊賀由佳

キャビテーションに関するシンポジウム(第21回)　2023/12/08
The Effects of a Slit in a Hydrofoil on the Thermodynamic Self-Suppression Effect for Tip Leakage Vortex Cavitation

Yuto Oda, Junnosuke Okajima, Yuka Iga

20th International Conference on Flow Dynamics (ICFD2023)　2023/11/07
Effect of the difference in slit locations on the suppression of cavitation instabilities in an inducer

Naruki Ishikawa, Yuto Nakura, Satoshi Kawasaki, Mitsuru Shimagaki, Yuka Iga

AICFM17,Zhenjiang, China　2023/10/21
New Type of Cavitation Instability with Peculiar Frequency Characteristic in Liquid Rocket Inducer

Koki Tamura, Satoshi Kawasaki, Yuka Iga

AICFM17,Zhenjiang, China　2023/10/21
Compressible Gas-liquid Homogeneous Model for Numerical Analysis of Cavitating Flow, Bubble Collapse and Liquid Droplet Impingement Invited

Yuka Iga

AICFM17,Zhenjiang, China　2023/10/23
Fluid/Material Coupled Numerical Simulation of a Bubble Collapse near a Wall for Laser Cavitation Peening Invited

Yuka Iga

INCASE2023,Singapore　2023/09/27
液体ロケットインデューサの不安定抑制手法がキャビテーション動特性に与える影響

美濃拓生, 田村浩紀, 川崎聡, 伊賀由佳

ターボ機械協会第89回創立50周年記念学術講演会　2023/09/21
不安定現象発生時の液体ロケットインデューサの各翼におけるキャビテーション振動特性の解析

奈倉悠人, 田村浩紀, 川崎聡, 伊賀由佳

ターボ機械協会第89回創立50周年記念学術講演会　2023/09/21
翼端隙間を有する単独翼に発生する翼端漏れ渦キャビテーションの非定常特性に関する実験的研究

田村浩紀, 伊賀由佳

混相流シンポジウム2023, 札幌　2023/08/24
Estimation of Temperature in Unsteady Cavitating Flow around Triangular Obaject

Itaru Eguchi, Takashi Ohira, Junnnosuke Okajima, Yuka Iga

AJKFED2023, Osaka, Japan　2023/07/10
Investigating the Mechanism of Scale Effect of Cavitation Inception in Water

Aye Sandar Kyaw, Yuka Iga

AJKFED2023, Osaka, Japan　2023/07/12
Unsteady Characteristics of Tip Leakage Vortex Cavitation in the Occurrence of Cavitation Instability in Inducer

Koki Tamura, Yuto Nakura, Satoshi Kawasaki, Yuka Iga

AJKFED2023, Osaka, Japan　2023/07/11
An experimental study on thermodynamic self-suppression effect of cavitation in a single hydrofoil with slit

Takeru Katagiri, Junnosuke Okajima, Yuka Iga

AJKFED2023, Osaka, Japan　2023/07/10
遠心ポンプに発生する旋回キャビテーションの騒音測定

伊賀由佳, 横井貴志, 守谷修一, 能見基彦

ターボ機械協会第88回総会講演会. 福岡　2023/05/19
Transition of cavitation regime on heated NACA0015 hydrofoil

Ning Yang, Junnosuke Okajima, Yuka Iga

11th ICMF 2023, Kobe, Japan　2023/04/04
スリットインデューサにおけるスリット位置がキャビテーション不安定現象に与える影響に関する実験的研究

石川育輝, 田村浩紀, 木幡明日花, 川崎聡, 伊賀由佳

日本航空宇宙学会北部支部2023年講演会ならびに第4回再使用型宇宙輸送系シンポジウム, JSASS-2023-H022.　2023/03/21
液体ロケットインデューサに生じるキャビティ変動の画像処理を用いた定量的評価

奈倉悠人, 田村浩紀, 木幡明日花, 川崎聡, 伊賀由佳

日本航空宇宙学会北部支部2023年講演会ならびに第4回再使用型宇宙輸送系シンポジウム, JSASS-2023-H021.　2023/03/21
極低温ターボポンプ試験機(CTP-X-B)で発生したキャビテーションサージに関する一考察

田村浩紀, 美濃拓生, 川崎聡, 島垣満, 伊賀由佳

日本航空宇宙学会北部支部2023年講演会ならびに第4回再使用型宇宙輸送系シンポジウム, JSASS-2023-H023.　2023/03/21
Numerical Analysis of Rocket Pump Inducer with Backflow Restriction Step

Takuo Mino, Koki Tamura, Satoshi Kawasaki, Yuka Iga

11th AJCPP 2023, Kanazawashi Cultural Hall, Ishikawa, Japan　2023/03/16
New Thermodynamic Parameter for Cryogenic Cavitation derived by Numerical Analysis using Simplified Thermodynamic

Shuichi ICHIKI, Shunta TSUCHIYAMA, Masaki NAKANO, Junnosuke OKAJIMA, Yuka IGA

11th AJCPP 2023, Kanazawashi Cultural Hall, Ishikawa, Japan　2023/03/16
Experiment of Scale Effect on Cavitation Inception

Aye Sandar Kyaw, Yuka Iga

19th International Conference on Flow Dynamics (ICFD2022), Sendai, Miyagi (2022.11), OS21-58.
Investigation of Peculiar Sub-synchronous Oscillation of Cavitation in Inducer

Koki Tamura, Satoshi Kawasaki, Yuka Iga

19th International Conference on Flow Dynamics (ICFD2022), Sendai, Miyagi (2022.11), OS21-46.
逆流返し付きケーシングを有する液体ロケットインデューサの数値解析

美濃拓生, 田村浩紀, 川崎聡, 伊賀由佳

第87回ターボ機械協会京都講演会,京都,同志社大学,pp.187-193.　2022/09/22
スリットインデューサのスリット位置が高流量条件下においてキャビテーション不安定現象に及ぼす影響

木幡明日花, 田村浩紀, 川崎聡, 伊賀由佳

第87回ターボ機械協会京都講演会,京都,同志社大学,C08.　2022/09/22
Mitigation of Pressure Pulsation induced by Transition Cavitation on a Benchmark Hydrofoil Using a Passive Control Method

Ebrahim Kadivar, Takaho Ochiai, Yuka Iga, Ould el Moctar

41st International Conference on Ocean, Offshore & Arctic Engineering (OMAE2022), Hamburg, Germany
広範囲作動時の液体ロケットインデューサにおけるキャビテーション不安定現象の発生特性

田村浩紀, 近藤創太, 川崎聡, 伊賀由佳

ターボ機械協会第86回総会講演会,早稲田大学,No.A07　2022/05/13
Promotion of dissolved gas separation in cavitating flow by dynamic stimulation of unsteady cavitation

Yuka Iga

The 12th Japan-U.S. Seminar on Two-Phase Flow Dynamics 2022 (JP-US STPFD’22), Ann Arbor, Michigan, USA (online)　2022/05/10
Numerical Simulation of Hot Water Flashing Flow in a Converging - Diverging Nozzle

Anh Dinh Le, Quan Hoang Nguyen, Long Ich Ngo, Anh Viet Truong, Junnosuke Okajima, Yuka Iga

Numerical Simulation of Hot Water Flashing Flow in a Converging - Diverging Nozzle The AUN/SEED-Net Joint Regional Conference in Transportation, Energy,and Mechanical Manufacturing Engineering (RCTEMME2021),　2021/12/11
Numerical analysis of effect of slit shape on the performance and cavitation instability of liquid rocket inducer

Asuka Kowata

3rd IAHR-Asia Symposium on Hydraulic Machinery and Systems, Web (2021.11), CT006.　2021/11
ロケットインデューサに発生する超同期旋回キャビテーションの振動特性に関する数値解析

近藤創太, 田村浩紀, 川崎聡, 伊賀由佳

日本機械学会第99期流体工学部門講演会, web　2021/11/08
NACA16-012翼形に発生するキャビテーション消滅現象と境界層の関係

菅谷航己, 岡島淳之介, 伊賀由佳

日本機械学会第99期流体工学部門講演会, web　2021/11/09
Visualization of rotating cavitation in a centrifugal pump

Takashi Yokoi

The 16th Asian International Conference on Fluid Machinery (AICFM16)　2021/09
Experimental Study of Pressure Distribution on NACA16-012 Hydrofoil with Cavitation Disappearance Phenomenon

Koki Sugaya

The 16th Asian International Conference on Fluid Machinery (AICFM16)　2021/09
Experimental Study of Partial Cavitation on Heated NACA0015 Hydrofoil

Ning Yang, Junnosuke Okajima, Yuka Iga

11th International Symposium on Cavitation (CAV2021), Web (2021.5), No. P00090.　2021/05/11
液体ロケットインデューサのスリット形状が性能及び不安定現象に及ぼす影響の数値解析

木幡明日花, 金丸萌菜, 川崎聡, 伊賀由佳

日本航空宇宙学会北部支部2021年講演会ならびに第2回再使用型宇宙輸送系シンポジウム, Web　2021/03/18
Influence of Rotational Speed of an Inducer on the Propagation Velocity of Super-synchronous Rotating Cavitation

Sota Kondo

18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC18), Web (2020.11), No. 2019-00100.　2020/11/25
Experimental Study of Break-off Frequency in Cavitation Disappearance Phenomenon on NACA16-012 Hydrofoil

Koki Sugaya

18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC18), Web (2020.11), No. 2019-00142.　2020/11/25
Numerical study of slit position for suppression effect on cavitation instabilities in inducers

Moena Kanamaru

17th International Conference on Flow Dynamics (ICFD2020), Web (2020.10), OS18-15, (On Demand).　2020/10
Active and Passive Control of Unsteady Cavitation on a Hydrofoil

Takaho Ochiai

17th International Conference on Flow Dynamics (ICFD2020), Web (2020.10), OS19-CRF67.　2020/10/29
Science of Ultrafine Drop and High Speed Impact

Takehiko Sato

The 20th International Symposium on Advanced Fluid Information (AFI2020), Web (2020.10), No. CRF-17.　2020/10/28
Improvement of Pressure Measurement Method in a Laser-Induced Cavitation Bubble

Takehiko Sato

The 20th International Symposium on Advanced Fluid Information (AFI2020), Web (2020.10), (Poster).　2020/10/28
加熱された翼形からの伝熱がキャビテーション流れへ及ぼす影響

岡島淳之介

ターボ機械協会第83回総会講演会, web (2020.5.15), No.B11.　2020/05/15
スリットインデューサによる低流量条件下での揚程安定化に関する研究

金丸萌菜

ターボ機械協会第83回総会講演会, web (2020.5.15), No.B07.　2020/05/15
Numerical Study of Effect of Vapor Bubble Behavior on Wetting Condition in Boiling Flow

Junnosuke Okajima, Peter Stephan

72nd Annual Meeting of the APS Division of Fluid Dynamics, Seattle, Washington (2019.11), P21.00003.　2019/11/25
Numerical Study of Mechanism of Deep Erosion Pit in High-speed Liquid Droplet Impingement

Yuka Iga

72nd Annual Meeting of the APS Division of Fluid Dynamics, Seattle, Washington (2019.11), H24.00009.　2019/11/25
Experimental and Numerical Studies of Unsteady Cavitation in a Centrifugal Pump for Visualization International-presentation

Donghyuk Kang, Pin Hu, Junnosuke Okajima, Motohiko Nohmi, Yuka Iga

The 19th International Symposium on Advanced Fluid Information (AFI2019)　2019/11/07
Numerical Investigation of Thermodynamic Parameter in Cavitating flow of Liquid Hydrogen International-presentation

Masaki Nakano, Le Dinh Anh, Junnosuke Okajima, Iga Yuka

16th International Conference on Flow Dynamics (ICFD2019)　2019/11/07
Visualization of Cavitation Behavior around the Fin in the Heat Exchanger International-presentation

Ning Yang, Shuichi Moriya, Junnosuke Okajima, Tomokazu Nomura, Yuka Iga

16th International Conference on Flow Dynamics (ICFD2019)　2019/11/07
Development of Temperature Measurement System for Cavitation in High Temperature Water International-presentation

Taku Hanyuda, Junnosuke Okajima, Yuka Iga

16th International Conference on Flow Dynamics (ICFD2019)　2019/11/07
超同期旋回キャビテーションの発生に及ぼすインデューサ回転数の影響

近藤創太, 金丸萌菜, 川崎聡, 伊賀由佳

日本機械学会第97期流体工学部門講演会　2019/11/07
NACA16-012 翼形のキャビテーション消滅現象と破断周波数の関係

菅谷航己, Turchet-Gasnier Adrien, 岡島淳之介, 伊賀由佳

日本機械学会第97期流体工学部門講演会　2019/11/07
Experimental Investigation of Unsteady Characteristics of Centrifugal Pump International-presentation

Shunta TSUCHIYAMA, Junnosuke OKAJIMA, Donghyuk KANG, Motohiko NOHMI, Yuka IGA

16th International Conference on Flow Dynamics (ICFD2019)　2019/11/06
Development of Active Control System for Suppression of Unsteady Cavitation on NACA16-012 International-presentation

Takaho Ochiai, Koki Sugaya, Adrien Turchet, Junnosuke Okajima, Yuka Iga

16th International Conference on Flow Dynamics (ICFD2019)　2019/11/06
Experimental and Numerical Study of Hot Water Cavitation on a NACA0015 Hydrofoil

Le Dinh Anh, Junnosuke Okajima, Yuka Iga

The 5th International Conference on Engineering Mechanics and Automation (ICEMA-5), Hanoi (2019.10)
Experimental and Numerical Studies for Unsteady Cavitation in a Centrifugal Pump for Visualization

Pin Hu, Junnosuke Okajima, Donghyuk Kang, Motohiko Nohmi, Yuka Iga

15th Asian International Conference on Fluid Machinery (AICFM15), Busan, Korea (2019.9), P00164.　2019/09/28
Numerical Study of Appearance of Gaseous Cavitation around a Stator Blade in Torque Converter

Shumpei Takahashi, Tomohiko Usui, Yuka Iga

15th Asian International Conference on Fluid Machinery (AICFM15), Busan, Korea (2019.9), P00011.　2019/09/27
Characteristics of the Cavitating flow on Heated Hydrofoil International-presentation

Masaki Ito, Junnosuke Okajima, Yuka Iga

15th Asian International Conference on Fluid Machinery　2019/09/26
Effect of Bubble Radius on Ability of Submerged Laser Peening International-presentation

Hirotoshi Sasaki, Yuka Iga, Hitoshi Soyama

Proc. International Conference on Advanced Surface Enhancement (INCASE 2019)　2019/09/11
高速液滴衝突におけるエロージョンの進行メカニズムに関する流体・材料連成数値解析

佐々木裕章, 古屋修, 伊賀由佳

混相流シンポジウム2019　2019/08/06
An Experimental Study of Influence of Slits in Throat Position on Suppression of Cavitation Instabilities in Liquid Propellant Rocket Inducer International-presentation

Moena Kanamaru, Yoshito Kamikura, Satoshi Kawasaki, Takashi Shimura, Iga Yuka

AJKFluids ASME-JSME-KSME Joint Fluids Engineering Conference 2019　2019/07/31
In-Situ Measurement of Liberation of a Dissolved Gas in Unsteady Cavitating Flow in a Water International-presentation

Daiki Makii, Hirotoshi Sasaki, Yuka Iga

AJKFluids ASME-JSME-KSME Joint Fluids Engineering Conference 2019　2019/07/29
Investigation of Cavitating flow on a Heated Hydrofoil International-presentation

Masaki Ito, Junnosuke Okajima, Yuka Iga

10th International Conference on Multiphase Flow　2019/05/23
Fluid/Material Coupled Numerical Simulation of Bubble Collapse Near a Wall International-presentation Invited

IGA Yuka

The 3rd International Symposium of Cavitation and Multiphase Flow (ISCM2019)　2019/04/20
"Numerical Analysis of the Influence of the Symmetrical Slits in an Inducer on the Suppression of Oscillating Cavitation"

2019/03/07
Numerical Study of a Bubble Colapse Near a Wall by Fluid/Material Coupled Numerical Simulation International-presentation

IGA Yuka

2019 Japan-China-Korea Hydraulic Machine Workshop at the WASEDA University, Tokyo, Japan(2019.1), HMW-17.　2019/01/26
Numerical Study of a Bubble Colapse Near a Wall by Fluid/Material Coupled Numerical Simulation International-presentation

Yuka IGA, Hirotoshi SASAKI

2019 Japan-China-Korea Hydraulic Machine Workshop at the WASEDA University　2019/01/25
Study on Gaseous Cavitation around a Hydrofoil in Oil Flow International-presentation

Shumpei Takahashi

Fifteenth International Conference on Flow Dynamics (ICFD2018), Sendai, Miyagi (2018.11), Session Type：OS18，Presentation No：41　2018/11/08
An Experimental Study on Suppression of Rotating Cavitation in Rocket Turbopump Inducer with Slit International-presentation

Yoshito Kaikura

Fifteenth International Conference on Flow Dynamics (ICFD2018), Sendai, Miyagi (2018.11), Session Type：OS18，Presentation No：34　2018/11/08
Observation of Cavitating Flow on a Heated Hydrofoil International-presentation

Masaki Ito

Fifteenth International Conference on Flow Dynamics (ICFD2018), Sendai, Miyagi (2018.11), Session Type：OS18，Presentation No：22　2018/11/07
Numerical Simulation of Cavitating Flow with Thermodynamic Effects of Cavitation International-presentation

Anh Dinh Le

The International Conference on Fluid Machinery and Automation Systems (ICFMAS2018), Hanoi, Vietnam (2018.10), ICFMAS071　2018/10/28
Numerical and Experimental Investigation of Cavitation Instabilities in Turbopump in Liquid Propellant Rocket International-presentation Invited

IGA Yuka

The First International Conference on Fluid Machinery and Automation Systems (ICFMAS2018), Hanoi, Vietnam (2018.10.27-28(27)), pp. 528-534.　2018/10/27
水中レーザピーニングの加工能力における気泡径の影響

佐々木裕章

第19回キャビテーションに関するシンポジウム, 札幌(2018.10.18-19(19)), No. 25　2018/10/19
キャビテーション流れの非定常性と溶存気体析出との関係に関する実験的研究

伊賀由佳

第19回キャビテーションに関するシンポジウム, 札幌(2018.10.18-19(19)), No.29, pp.1-6　2018/10/19
NACA16-012翼形に発生するキャビテーションの消滅現象の非定常特性に関する研究

大平佳生

第19回キャビテーションに関するシンポジウム, 札幌(2018.10.18-19(18)), No.19　2018/10/18
スリット付きインデューサの旋回キャビテーション抑制に関する実験

上倉義人

ターボ機械協会第80回学術講演会, 仙台(2018.10.12), No.C13　2018/10/12
Three dimensional numerical analysis of inducer about suppression of cavitation instabilities by asymmetric slits on blades International-presentation

Yoshito Kamikura

29th IAHR Symposium on Hydraulic Machinery and Systems, Kyoto, Japan(2018.9), No.371.　2018/09/20
A Simplified Thermodynamic Effect Model for Cavitating Flow in Hot Water International-presentation

Anh Dinh Le

29th IAHR Symposium on Hydraulic Machinery and Systems, Kyoto, Japan(2018.9), No.171.　2018/09/18
Numerical Analysis of Liquid Droplet Impingement on Rough Material Surface with Water Pool International-presentation

Hirotoshi SASAKI

29th IAHR Symposium on Hydraulic Machinery and Systems, Kyoto, Japan(2018.9), No.386.　2018/09/18
Development of gaseous cavitation model in hydraulic oil flow considering the effect of dynamic stimulation International-presentation

Yosuke IBATA

29th IAHR Symposium on Hydraulic Machinery and Systems, Kyoto, Japan(2018.9), No.314.　2018/09/18
Interaction between Thermodynamic Suppression Effect and Reynolds Number Promotion Effect on Cavitation in Hot Water International-presentation

IGA Yuka

Proc. The 10th International Symposium on Cavitation (CAV2018), Baltmore, USA (2018.5), No. Thermal effects-2.　2018/05/16
Experimental Study of Disappearance Phenomenon of Unsteady Cavitation on NACA16-012 International-presentation

Yoshiki Odaira

Proc. The 10th International Symposium on Cavitation (CAV2018), Baltmore, USA (2018.5), No. Cavitation in Fluid Machinery I -1.　2018/05/15
"Influence of flow stimulation on occurrence of gaseous cavitation in hydraulic oil"

2018/03/05
Simplified Modeling of Cavitating Flow with Thermodynamic Effect for Homogeneous Model International-presentation

Le Dinh ANH

17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC17), Maui (2017.12), No. 404. (pp. 7 pages)　2017/12/19
A Fundamental Study of Disappearance Phenomenon of Partial Cavitation on the NACA 16012 Hydrofoil International-presentation

Yoshiki OODAIRA

17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC17), Maui (2017.12), No. 67. (pp. 5 pages)　2017/12/19
Thermodynamic Effect on Tip Leakage Vortex Cavitation International-presentation

Donghyuk KANG

The 7th International Symposium on Advanced Fluid Information (AFI2017), Sendai, Japan (2017.11), No. CRF-58, pp. 118-119.　2017/11/02
A Thermodynamic Effect in a Tip Leakage Vortex Cavitation around a Hydrofoil in Hot Water International-presentation

Donghyuk KANG

The 9th JSME-KSME Thermal and Fluids Engineering Conference, Okinawa, Japan (2017.10), No. TFEC9-1471.　2017/10/29
An Experimental Study of Influence of a Slit on Cavitation Characteristics in a Single Hydrofoil International-presentation

Hiroki Kobayashi

The 9th JSME-KSME Thermal and Fluids Engineering Conference, Okinawa, Japan (2017.10), No. TEFC-1329.　2017/10/29
Fluid/Material Coupled Numerical Analysis of Relationship between Behavior of Bubble Collapse and Distribution of Stress in Material International-presentation

Hirotoshi SASAKI

The 9th JSME-KSME Thermal and Fluids Engineering Conference, Okinawa, Japan (2017.10), No. TEFC9-1251.　2017/10/29
Numerical Modeling of Gaseous Cavitation in CFD of Hydraulic Oil Flow Based on Dynamic Stimulation International-presentation

Yudai MATSUURA

ASME/BATH 2017 Symposium on Fluid Power and Motion Control (FPMC2017), Sarasota,FL, USA(2017.10), FPMC2017-4219. (pp. 6 pages)　2017/10/18
材料表面の荒れと液膜が高速液滴衝突の衝撃に及ぼす影響

佐々木裕章

ターボ機械協会第78回富山講演会, 富山(2017.9.15), No.B13　2017/09/15
外部空気流付加による水ジェットの微粒化とデンタルプラーク洗浄への応用に関する研究

伊賀由佳

混相流シンポジウム2017, 電気通信大学, 東京(2017.8.19-21(20)), No. E222　2017/08/20
"Investigation of the influence of discharge inside plasma-induced bubble"

2017/03/14
溶存空気の析出を考慮した油中キャビテーションの数値解析

松浦優大

日本機械学会東北支部第52期総会・講演会, 仙台(2017.3.14) , No.168　2017/03/14
"A fundamental study on disappearance of partial cavitation on the NACA16012 hydrofoil"

2017/03/14
一次元マルチドメイン解析によるインデューサのキャビテーション動特性に関する考察

キャビテーションに関するシンポジウム(第18回), 福岡　2016/12/09
気泡崩壊挙動と材料内応力分布の関係に関する流体・材料連成数値解析

キャビテーションに関するシンポジウム(第18回), 福岡　2016/12/08
油中キャビテーションの数値解析モデルの検討

キャビテーションに関するシンポジウム(第18回), 福岡　2016/12/08
キャビテーションの成長・崩壊挙動に及ぼす熱力学的効果の影響

日本機械学会第94期流体工学部門講演会, 山口　2016/11/12
Energy from Methane Hydrate: System Design, Numerical Modeling and Experimental Verifications International-presentation

6th International Conference on Power and Energy Systems　2016/11
An experimental study of cavitation on a hydrofoil with tip clearance and slit International-presentation

The 7th International Symposium on Fluid Machinery and Fluids Engineering(ISFMFE2016), Jeju　2016/10/19
Influence of Cavitation Model on Cavity Surface Transition in a Nozzle

The 13th International Conference on Flow Dynamics(ICFD2016), Sendai　2016/10/11
Thermodynamic Effect on Tip Leakage Vortex Cavitation

The 13th International Conference on Flow Dynamics(ICFD2016), Sendai　2016/10/11
A Fundamental Research of Inception of Gaseous Cavitation in Hydraulic Oil

The 13th International Conference on Flow Dynamics(ICFD2016), Sendai　2016/10/10
高速液滴衝突における材料表面液膜の影響に関する流体・材料連成数値解析

ターボ機械協会第76回北見講演会, 北見　2016/09/30
高速液滴衝突時に発生するキャビテーション気泡崩壊の流体・材料連成数値解析

流体力学会年会2016, 名古屋　2016/09/27
Study of Methane Hydrate as a Future Energy Resource: Low Emission Extraction and Power Generation International-presentation

2016 International Conference on New Energy and Future Energy System　2016/08/19
Experimental Study of Thermodynamic Effect of Tip Vortex Cavitation in Hot Water International-presentation

International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2016), Hawaii, Honolulu　2016/04/15
One-Dimensional Analysis Method for Cavitation Instabilities of a Rotating Machinery International-presentation

International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2016), Hawaii, Honolulu　2016/04/15
Numerical Analysis of Supression Effect of Random Slit on Rotating Cavitation and Cavitation Surge in Cascade International-presentation

International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2016), Hawaii, Honolulu　2016/04/11
半球状気泡における周囲温度の影響に関する数値解析

日本機械学会東北支部第51期総会・講演会，仙台　2016/03/11
Mechanical Surface Treatment of Duralumin Plate by Bubble Induced by Pulse Laser International-presentation

Hitoshi SOYAMA

Proc. The 9th International Symposium on Cavitation (CAV2015), Lausanne Switzerland (2015). No.012108. (pp. 4 pages)　2015/12/09
Consideration of a Phase Change Model Based on Apparent Phase Equilibrium International-presentation

Shun KASHIWADA

Proc. The 9th International Symposium on Cavitation (CAV2015), Lausanne Switzerland (2015), No. 012129. (pp. 4 pages)　2015/12/07
Thermodynamic Effect on Tip Leakage Vortex Cavitation International-presentation

Donghyuk KANG

Proc. the 15th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI 2015), Sendai (2015), No. CRF-13, pp. 26-27 (Poster).　2015/10/28
Fluid/Material Coupled Numerical Analysis of Thermal Effect on Non-spherical Bubble Collapse International-presentation

Susumu ENDO

Proc. Twelfth International Conference on Flow Dynamics (ICFD2015), Sendai (2015), pp. 678-679 (Poster).　2015/10/28
“Evaluation of the Micro Supersonic Nozzle Geometry for the High Heat Flux Heat Sink”

2015/10/25
気液平衡二相流動方程式の定式化と一次元ノズルの挙動

円山重直

日本機械学会熱工学コンファレンス2015 講演論文集, 大阪吹田(2015.10.24-25(24)), No.B141　2015/10/24
"Thermodynamic Effect and Scale Effect on Cavitation Inception around NACA16012 Hydrofoil"

2015/09/27
Numerical Analysis of High Speed Liquid Droplet Impingement by Fluid/Material Coupled Numerical Method International-presentation

Hirotoshi SASAKI

Proc. 13th Asian International Conference of Fluid Machinery (AICFM13), Tokyo, Japan (2015), No. AICFM13-101. (pp. 6 pages)　2015/09/09
Influence of Single-Phase Turbulence Model on Reynolds Number Effect on Cavitation Pattern in a Nozzle International-presentation

Anh Dinh LE

Proc. 13th Asian International Conference of Fluid Machinery (AICFM13), Tokyo, Japan (2015), No.AICFM13-169. (pp. 10 pages)　2015/09/09
Suppression of Cavitation Instabilities in a Cascade by Using a Random Slit International-presentation

Ryosuke HAGIWARA

Proc. 13th Asian International Conference of Fluid Machinery (AICFM13), Tokyo, Japan (2015), No. AICFM13-128. (pp. 8 pages)　2015/09/09
"Numerical Analysis of Flow Velocity Dependence on Wear Rate in Liquid Droplet Impingement Erosion"

2015/08/06
The Numerical Analysis of Control Effect on Cavitation Instabilities in a Cascade with a Random Slit International-presentation

Ryosuke HAGIWARA

Proc. ASME-JSME-KSME Joint Fluids Engineering Conference 2015 (AJK2015-FED), Seoul, Korea (2015), No. AJK2015-33292. (pp. 6 pages)　2015/07/30
“Estimation of cooling performance of high heat flux heat sink using supersonic flow inside a micro channel with asymmetric converging-diverging nozzle”

2015/06/04
NACA16012翼形のキャビテーション形態における主流温度とレイノルズ数の影響

伊賀由佳

ターボ機械協会第72回総会講演会, 東京(2015.5.8), No.A07　2015/05/08
高温水キャビテーションの発生形態に及ぼす主流温度とレイノルズ数の影響

日本機械学会東北支部第50期総会・講演会　2015/03/13
溶存気体析出効果を考慮した相変化モデルによる非定常キャビテーション流れの数値解析

日本機械学会東北支部第50期総会・講演会講演論文集　2015/03/13
高速液滴衝突におけるキャビテーション気泡の発生に関する数値解析

日本機械学会第27回計算力学講演会（CMD2014）　2014/11/22
キャビティ体積の予測精度向上を目的とした相変化モデルの検討

キャビテーションに関するシンポジウム(第17回)講演論文集　2014/11/21
高温水キャビテーションの発生形態に及ぼす熱力学的効果の実験的研究

キャビテーションに関するシンポジウム(第17回)　2014/11/21
Measurement of Density Field of Supersonic Flow inside a Micro-channel by using Phase Shifting Interferometer International-presentation

25th International Symposium on Transport Phenomena　2014/11/06
Numerical Analysis of Unsteady Cavitation and Cavitation Instabilities by Using Compressible Homogeneous Model International-presentation Invited

Iga Yuka

International Symposium of Cavitation and Multiphase Flow (ISCM 2014)　2014/10/19
Effect of single-phase turbulence model on 3-D structure of cavitation inside a nozzle International-presentation

Eleventh International Conference on Flow Dynamics (ICFD2014)　2014/10/08
Numerical Analysis Behavior of Cavitation Bubble in Liquid Droplet Impingement International-presentation

Eleventh International Conference on Flow Dynamic　2014/10/08
Calculation of Turbulent Characteristic of Natural Convection in Parallel Heated Plates at High Rayleigh Number by Large Eddy Simulation International-presentation

Takuma KOGAWA

Proc. 11th International Conference on Flow Dynamics (ICFD2014), Sendai (2014), pp. 504-505.　2014/10/08
Numerical Analysis of Unsteady Cavitating Flow by using a Modification based on an Assumption of Apparent Phase Equilibrium International-presentation

27th IAHR Symposium Hydraulic Machinery and Systems　2014/09/24
Thermodynamic Effect on Cavitation in High Temperature Water International-presentation

ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting and 11th International Conference on Nanochannels, Microchannels, and Minichannels (FEDSM2014)　2014/08/04
2次元ノズル内のキャビティ界面に及ぼす流速の影響

第42回可視化情報シンポジウム　2014/07/21
高熱流束ヒートシンクのための超音速マイクロチャネル内流れの密度場計測

第51回日本伝熱シンポジウム　2014/05/22
LESを用いた鉛直加熱平行平板間の乱流自然対流伝熱特性及び乱流構造の評価

第51回日本伝熱シンポジウム　2014/05/21
気液相平衡における二相流熱力学モデルの検討とその応用例

第14回日本伝熱学会東北支部学生発表会　2014/05/10
高温高圧水キャビテーションタンネル実験設備の概要 International-presentation

ターボ機械協会第71回総会講演会　2014/05/09
液体窒素中の対称翼に発生するキャビテーションの数値解析

日本機械学会北陸信越学生会第43回学生員卒業研究発表講演会　2014/02/21
Density Measurement of Supersonic Air Flow Inside a Bumped Micro-channel using Interferometer International-presentation

Yuya TAKAHASHI

Proc. 11th International Conference on Flow Dynamics (ICFD2014), Sendai (2014), pp. 344-345.　2014
Thermal Effects in Bubble Clouds of Cavitation International-presentation

Kazuki NIIYAMA

Proc. the 13th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI/TFI-2013), Sendai (2013), CRF-7, pp.14-15 (Poster).　2013/11/26
Evaluation of Heat Transfer of Turbulent Natural Convection in Vertical Parallel Plates by Large Eddy Simulation International-presentation

Takuma Kogawa

Proc. The 10th International Conference on Flow Dynamics (ICFD2013), Sendai (2013), pp. 672-672 (Poster).　2013/11
Preliminary Experiment of Supersonic Micro-channel Gas Flow Visualization by Using Interferometer International-presentation

Yuya Takahashi

Proc. The 10th International Conference on Flow Dynamics (ICFD2013), Sendai (2013), pp. 702-703 (Poster).　2013/11
LESによる平行平板間における乱流自然対流熱伝達の熱流動特性評価

熱工学コンファレンス2013　2013/10/20
Study of supersonic Micro-Channel for Cooling Electronic Devices International-presentation

ASME2013 11th International Conference on Nanochannels, Microchannels, and Minichannels ICNMM2013　2013/06/19
超音速マイクロノズルを適用した冷却フィンの冷却特性

第13回日本伝熱学会学生発表会　2013/05
超音速マイクロノズルの冷却デバイス適用に関する研究

日本機械学会東北支部第48期総会・講演会　2013/03/15
均質モデルによる極低温流体中の翼形まわりに発生するキャビテーションの数値解析

キャビテーションに関するシンポジウム（第16回）　2012/11/24
キャビテーション流れの数値シミュレーション Invited

伊賀由佳

金沢工業大学特別講演会, 金沢(2012.11.22)　2012/11/22
キャビテーションの熱力学的効果に対する気泡周囲温度拡散の影響

日本機械学会流体工学部門講演会　2012/11/18
Numerical Prediction of Cavitation Erosion Using a Coupled Analysis of Cavitating Flow Field and Bubbles International-presentation

12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11
Numerical Study of Influence of Initial Standoff Distance on Impulsive Pressure Induced by Single Bubble Collapse near Wall Boundary (Integration to the Next-generation Megasonic Cavitation Cleaning Technology) International-presentation

12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration, AFI/TFI-2012, Sendai, Miyagi, Japan, Nov. 19-21　2012/11
マイクロチャネルにおける気泡の熱流動挙動に関する数値解析

熱工学コンフェレンス　2012/11
見掛けの相平衡を仮定した相変化モデルによる遷移キャビテーション流れの数値解析

日本機械学会東北支部第４８期秋季講演会　2012/09/22
Mechanism of Thermal Effects in Micro-bubble Cavitation International-presentation

12th International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration (AFI/TFI-2011)　2012/09/20
Phase Change Model based on the Idea of Apparent Phase Equilibrium in Unsteady Cavitating Flow International-presentation

The 8th International Symposium on Cavitation (CAV2012)　2012/08/15
気泡核分布の影響を考慮したキャビテーションエロージョンの数値予測

日本混相流学会年会講演会2012　2012/08/11
Advancement of Prediction Accuracy of Transient Cavitating Flow around a Hydrofoil International-presentation

The Eighth KSME-JSME Thermal and Fluids Engineering Conference (8th TFEC)　2012/03/20
Numerical Analysis of Influence of Acceleration on Cavitation Instabilities in Cascade International-presentation

The 11th Asian International Conference on Fluid Machinery and The 3rd Fluid Power Technology Exhibition (AICFM-11)　2011/11/23
Advancement of Numerical Method for Cavitating Flow Around A Hydrofoil International-presentation

Eighth International Conference on Flow Dynamics　2011/11/10
翼列のキャビテーション不安定現象に及ぼす加速度場の影響に関する数値解析

日本機械学会２０１１年度年次大会　2011/09
Numerical Analysis of Influence of Pipe Length on Cavitation Surge International-presentation

ASME-JSME-KSME Joint Fluids Engineering Conference 2011 (AJK2011)　2011/07
風洞実験によるオオオナモミの風耐性における力学的性質の解析

日本生態学会第58回大会　2011/03
On Boundary Conditions for Cavitation CFD and System Dynamics of Closed Loop Channel International-presentation

Motohiko NOHMI

Proc. ASME-JSME-KSME Joint Fluids Engineering Conference 2011 (AJK2011), Hamamatsu, Japan (2011), Paper No. AJK2011-33007. (pp. 8 pages)　2011
Numerical Analysis of Influence of Gravity on Cavitation Instabilities in Cascade International-presentation

IGA Yuka

Proc. The 11th Asian International Conference on Fluid Machinery and The 3rd Fluid Power Technology Exhibition (AICFM-11), Chennai India (2011), Paper No. AICFM11_AT_012. (pp. 8 pages)　2011
非定常キャビテーション流れ解析における境界条件の影響

キャビテーションに関するシンポジウム（第15回）　2010/11
Study of Droplet Impingiment Phenomena by Fluid/Solid Coupled Simulation International-presentation

Joint Int. Conf. on Supercomputing in Nuclear Applications and Monte Carlo 2010 (SNA+MC2010)　2010/10
壁面近傍での非球状気泡崩壊挙動に関する一考察

日本機械学会流体工学部門講演会　2010/10
A Detailed Observation of Hydrofoil Cavitation and a Proposal for Improving Cavitation Model International-presentation

ASME 2010 Fluids Engineering Conference, FEDSM-ICNMM　2010/08
Numerical Analysis of Control of Cavitation Instabilities in Tandem Cascade International-presentation

Asian Joint Conference on Propulsion and Power 2010 (AJCPP2010)　2010/03
壁面近傍での非球状気泡崩壊と誘起衝撃圧の数値解析

日本機械学会東北支部第45期総会講演会　2010/03
Numerical Analysis of Turbulent Cavitation Around a Hydrofoil International-presentation

Genki YAMAMOTO

The 6th International Conference on Flow Dynamics (ICFD2009)　2009/11/05
Influence of Inlet and Outlet Pipe Length on Cavitation Surge International-presentation

9th International Symposium on Advanced Fluid Information and 6th International Symposium on Transdisciplinary Fluid Integration (AFI/TFI 2009)　2009/11
RANS/LESハイブリッドモデルを用いたキャビテーション乱流の数値解析

日本機械学会2009年度年次大会　2009/09
水中翼周りのキャビテーションの詳細観察

第60回ターボ機械協会総会講演会　2009/09
A Study of Propagating Speed of Rotating Cavitation Based on Numerical Analysis International-presentation

2009 ASME Fluids Engineering Conference (FEDSM)　2009/08
Numerical Investigation of Thermodynamic Effect on Unsteady Cavitation in Cascade International-presentation

The 7th International Symposium on Cavitation (CAV2009)　2009/08
Numerical Prediction of Cavitation Erosion in Cavitating Flow International-presentation

The 7th International Symposium on Cavitation (CAV2009)　2009/08
Thrmodynamic Effect on Sub-synchronous Rotating Cavitation and Surge Mode Oscillation in a Space Inducer International-presentation

2009 ASME Fluids Engineering Conference (FEDSM)　2009/08
翼列に発生するキャビテーション不安定現象の数値解析 Invited

伊賀由佳

日本混相流学会, 混相流流れのダイナミクス分科会＆濡れ性と混相流研究分科会, 富山(2009.7.20)　2009/07/20
蒸気泡の挙動に及ぼす液温の影響に関する数値解析

キャビテーションに関するシンポジウム（第14回）　2009/03/20
旋回キャビテーションの発生メカニズムに関する一提案

キャビテーションに関するシンポジウム（第14回）　2009/03/20
熱力学的効果が亜同期旋回キャビテーションに与える影響

キャビテーションに関するシンポジウム（第14回）　2009/03/20
キャビテーションエロージョンの数値予測法の研究

キャビテーションに関するシンポジウム（第14回）　2009/03/19
A Fluid/Material Coupled Analysis of Liquid Droplet Impact International-presentation

8th International Symposium on Advanced Fluid Information and 5th International Symposium on Trasdisciplinary Fluid Integration (AFI/TFI 2008)　2008/12
Influence of Inlet Pipe Length on Cavitation Instabilities in Cascade International-presentation

The Seventh JSME-KSME Thermal and Fluids Engineering Conference (TFEC7)　2008/10
ＪＡＸＡ極低温キャビテーションタンネルの紹介

日本機械学会2008年度年次大会　2008/08
Numerical Prediction method of Cavitation Erosion International-presentation

2008 ASME Fluids Engineering Conference　2008/08
キャビテーション流れ中の気泡挙動解析と壊食性予測

混相流学会年次大会　2008/08
翼列キャビテーション流れにおける三種のサージ的振動

日本機械学会2008年度年次大会　2008/08
数値解析によるキャビテーション壊食予測技術の開発 International-presentation

第５９回タ－ボ機械協会総会講演会　2008/05
熱力学的効果の差異による同期旋回キャビテーションの様相の違い

第５９回タ－ボ機械協会総会講演会　2008/05
同期旋回キャビテーションのサージ的振動

日本機械学会東北支部第43期総会講演会　2008/03
Interaction between Uneven Cavity Length and Shaft Vibration at The Inception of Synchronous Rotating Cavitation International-presentation

nternational Symposium on Transport Phenomena and Dynamics of Rotating Machinery　2008/02
Numerical Analysis of Pressure Propagation and Oscillating Characteristics of Cavitation Surge in Cascade International-presentation

Proc. The 9th ASIAN International Conference on Fluid Machinery　2007/10/16
翼列のキャビテーション流れにおける熱力学的効果の数値解析

日本機械学会2007年度年次大会　2007/09/09
同期旋回キャビテーション初生時のキャビティの挙動

風見佑介

日本機械学会2007年度年次大会講演論文集, 大阪(2007.9), No.07-1 Vol.Ⅱ, 231-232頁　2007/09
JAXA極低温インデュ－サ試験結果の概説

吉田義樹

第57回タ－ボ機械協会総会講演会講演論文集, 東京(2007.5.18), 1-6頁　2007/05/18
極低温流体中でインデューサに発生する旋回キャビテーションの挙動

笹尾好史

日本機械学会東北支部第42期総会講演会講演論文集, 仙台(2007.3.13）, No.2007-1 ,pp.193-194　2007/03/13
Propagating Behavior of Elastic Waves in Soliod Caused by Bubble Collapse International-presentation

Kentaro SHINBO

Proc. 7th International Symposium on Advanced Fluid Information and 4th International Symposium on Trasdisciplinary Fluid Integration (AFI/TFI 2007), Sendai (2007), pp.256-259.　2007
Numerical Analysis of Internal Flow in Turbopump Inducer Using Gas-Liquid Homogeneous Model International-presentation

Makiko ONOZAWA

Proc. 7th International Symposium on Advanced Fluid Information and 4th International Symposium on Trasdisciplinary Fluid Integration (AFI/TFI 2007), Sendai (2007), pp.260-263.　2007
Numerical Analysis of Erosive -Bubble Behavior in Cavitating Flow International-presentation

Naoya OCHIAI

Proc. The 9th ASIAN International Conference on Fluid Machinery (AICFM-9), Jeju (2007), Paper No.AICFM9-174. (pp. 6 pages)　2007
Thermodynamic Effect on Rotating Cavitation an Inducer International-presentation

Yoshifumi SASAO

Proc. ASME Fluids Engineering Division Summer Meeting (FEDSM2007), San Diego (2007), Paper No. FEDSM2007-37468. (pp. 7 pages)　2007
キャビテーションサージの振動特性に関する数値解析

川合啓

日本機械学会2006年度年次大会講演論文集, 熊本(2006.9), No.06-1 Vol.Ⅱ, 205-206頁　2006/09
同期旋回キャビテーション下のキャビティ長さ不均一について

笹尾好史

日本機械学会2006年度年次大会講演論文集, 熊本(2006.9), No.06-1 Vol.Ⅱ, 195-196頁　2006/09
二段翼列まわりのキャビテーション流れの流動特性に関する数値解析

平沼誠

第55回理論応用力学講演会講演論文集, 京都(2006.1), 101-102頁　2006/01
Thermodynamic Effect on Synchronous Rotating Cavitation in an Inducer International-presentation

Yoshifumi SASAO

Proc. Sixth International Symposium on Advanced Fluid Information (AFI2006), Tokyo, (2006), pp.75-76.　2006
Numerical Analysis About Suppression Effect of Tandem Cascade on Cavitation Instabilities International-presentation

Makoto HIRANUMA

Proc. 11th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-11), Hawaii (2006), Paper No. ISROMAC11-PAPER55. (pp. 7 pages)　2006
Numerical Study of Unstable Cavitation Phenomena Arising in Tandem Cascade International-presentation

The 8th ASIAN International Conference on Fluid Machinery　2005/10
Numerical Study of Cavitation Instabilities Arising in Cascade with Slit International-presentation

ASME Fluids Engineering Summer Conference　2005/06
遠心ポンプキャビテーションの詳細計測とCFD

能見基彦

第12回キャビテーションに関するシンポジウム講演論文集, 福岡(2004), 139-142頁　2004
遠心ポンプのキャビテーション流れ解析

能見基彦

日本機械学会流体工学部門講演会講演論文集, 大阪(2003), No.511, 68-69頁　2003
Cavitation CFD in a Centrifugal Pump International-presentation

Motohiko NOHMI

Proc. Fifth International Symposium on Cavitation (CAV2003), Osaka (2003), Paper No. Cav03-OS-4-010.　2003
Experimental and Numerical Study of Cavitation Breakdown in a Centrifugal Pump International-presentation

Motohiko NOHMI

Proc. The 2003 Joint ASME-JSME Fluids Engineering Summer Conference, Hawaii (2003), Paper No. FEDSM2003-45409. (pp. 8 pages)　2003
３枚羽根翼列内部に発生するキャビテーション不安定現象の数値解析

日本機械学会2002年度年次大会　2002/09
Numerical Analysis of Unstable Phenomena of Cavitation in Cascade with Finite Blade Numbers International-presentation

9th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery　2002/02
遠心ポンプ・キャビテーション揚程低下の実験的研究

能見基彦

日本機械学会2002年度年次大会講演論文集, 東京(2002), No.02-1 Vol.Ⅲ, 189-190頁　2002
Preconditioned Numerical Method for Gas-Liquid Two-Phase Flow

第15回数値流体力学シンポジウム　2001/12
Numerical Visualization of Instability Phenomena arising in Cavitating Cascade Flow International-presentation

First International Symposium on Advanced Fluid Information　2001/10
有限枚数翼列翼形まわりの非定常キャビテーション流れの数値解析

第11回キャビテーションに関するシンポジウム　2001/09
Numerical Study of Sheet Cavitation Break-off Phenomenon on a Cascade Hydrofoil International-presentation

Fourth International Symposium on Cavitation　2001/06
翼列まわりの二次元非定常キャビテーション流れの数値解析

日本機械学会流体工学部門講演会　2000/09
Numerical Analysis of Cavitating Flow through a 2-D Decelerating Cascade International-presentation

Byeong Rog SHIN

Proc. 1st International Conference on Computational Fluid Dynamics, Kyoto (2000), pp.1-6.　2000
翼列まわりの非定常キャビテーション流れの数値解析

第１０回キャビテーションに関するシンポジウム　1999/10
気体性キャビテーションの発生基礎特性に関する実験的研究 Invited

伊賀由佳

ターボ機械協会第86回総会講演会,早稲田大学,第31回畠山研究助成金受賞者研究報告　2022/05/13

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洗浄用微細ミスト生成装置、口腔内洗浄装置、ノズル、口腔内洗浄方法、および、洗浄用微細ミスト生成装置の洗浄用微細ミスト生成方法

圓山重直, 佐々木啓一, 岡島淳之介, 守谷修一, 石本淳, 太田信, 伊賀由佳, 冨士岳志, 竹内裕尚

特許第6485641号

Property Type: Patent
インデューサ

伊賀由佳

Property Type: Patent

Research Projects 39

都市部での高密度ドローン運行戦略のための空力相互作用を考慮した近接飛行限界の解明

安孫子聡子, 辻田哲平, 佐藤大祐, 伊賀由佳, 関根久子

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: 芝浦工業大学

2022/04/01 - 2025/03/31
流体工学関連分野に関する学術研究動向調査

伊賀由佳

Offer Organization: 日本学術振興会

System: 受託研究

2024/04 - 2025/03
広範囲作動ターボポンプのインデューサに関する研究

伊賀由佳

Offer Organization: 独立行政法人宇宙航空研究開発機構(JAXA)

System: 共同研究

2024/01 - 2025/03
カプラン水車における翼端漏れ流れによるキャビテーション現象の解明

伊賀由佳

Offer Organization: 日立三菱水力株式会社

System: 共同研究

2023/10 - 2025/03
「流体機械性能予測への応用も考慮したキャビテーション流れ解析技術に関する研究」 Competitive

伊賀由佳

Offer Organization: 株式会社荏原製作所

System: 共同研究

2013/05 - 2024/03

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極低温流体など、熱力学的効果の考慮が必要な流体の挙動予測および壊食の予測に関し、キャビテーションモデルの高度化を図るとともに、実験装置を用いて検証を行う。
広範囲安定作動インデューサに関する研究

伊賀由佳

Offer Organization: 独立行政法人宇宙航空研究開発機構(JAXA)

Category: 共同研究

2021/08 - 2023/03
水素利用等先導研究開発事業/エネルギーキャリアシステム調査・研究/水素キャリアシステムの高性能化と課題解決のための基盤流体技術の構築

伊賀由佳

Offer Organization: NEDO 国立研究開発法人新エネルギー・産業技術総合開発機構

System: 受託研究

2021/04 - 2023/03
Elucidation of solid-liquid-gas interfacial phenomena induced by pulse laser and its practical application

Soyama Hitoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Institution: Tohoku University

2018/10/09 - 2022/03/31

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The purpose of this study is to elucidate the solid-gas-liquid interface phenomenon that occurs when a pulsed laser is applied to a metal surface placed in water, and then applied for mechanical surface treatment. In this study, it was focused on the laser cavitation which is produced after laser ablation. In laser peening, it is thought that the impact force due to laser ablation is utilized, and there was no interest in laser cavitation, but the principal investigator found that the impact force due to laser cavitation is greater than that due to laser ablation. The improvement of fatigue strength of metal materials by surface modification using laser cavitation was demonstrated.
「気体性キャビテーションの発生基礎特性に関する実験的研究」 Competitive

伊賀由佳

Offer Organization: ターボ機械協会

System: 畠山研究助成金

2020/04 - 2021/03
「油中析出実験と乱流解析による革新的キャビテーションモデルの開発」 Competitive

伊賀由佳

System: 挑戦的研究（萌芽）

2018/06 - 2021/03
Surface Mechanics Design Using Laser Cavitation and Its Practical Application for 3D Additive Manufacturing Material

Soyama Hitoshi

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

2017/04/01 - 2020/03/31

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When the surface of a metallic material placed in water was irradiated with a pulsed laser, ablation and bubble, i.e., laser cavitation were generated. In present study, laser cavitation was investigated and it was utilized for mechanical surface modification utilizing the impact force generated at bubble collapse. In normal underwater laser peening, the impact force by ablation is used. In this study, the impact force at laser cavitation collapse was enhanced by optimizing the processing conditions, and it was applied to a titanium alloy by additive manufacturing, and the fatigue strength of the titanium alloy improved 2 times. It was also demonstrated that this mechanical surface modification can improve fatigue strength to the same level or more with less than half the energy of conventional water film laser peening and less than half the pulse density.
Cell Responses Induction Mechanism by Control of Generation and Transport of Plasma Charge Stimuli

SATO TAKEHIKO, FARHAT mohamed, NAKATANI tatsuyuki, SHIMIZU tetsuji

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

2016/04/01 - 2019/03/31

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The charge transport mechanism in water was clarified by constructing a measurement system of the electric potential and by analyzing an equivalent circuit model proposed in this study. Also, it was clarified that the micro bubbles generated by underwater plasma moved with the velocity of higher than 50 m/s by the electric field, and its electrical charge quantity of the bubbles was estimated. Furthermore, a device which gives only electrical charge stimuli without chemical stimuli to the cells was developed and it was clarified that the actin filaments in the cells were elongated by the charged stimuli. Also, we clarified the generation mechanism of the directional microjet aiming at injecting charges to the inside of the cells and propagation mechanism of the negative streamer, by developing the visualization method of the small pressure.
「オイルクーラー冷却水におけるキャビテーション発生特性の解明」 Competitive

伊賀由佳

Offer Organization: 株式会社本田技術研究所

System: 共同研究

2018/07 - 2019/03

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キャビテーションエロージョンが発生しないためのオイルクーラーの作動条件の設定や、形状の改良につながる知見を得る。
「在宅医療における新規口腔プラーク除去機器の開発・事業化」 Competitive

伊賀由佳

Offer Organization: 株式会社モリタ

System: 受託研究

2018/04 - 2019/03

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少水量で高い除去効果を有する20μｍマイクロミストを用いた新規口腔プラーク除去装置の開発．非臨床研究，臨床研究，量産機試作と，それを用いた検証的治験の実施を通じ，歯面及び口腔粘膜面への安全性，有効性を検証する．
「高温水キャビテーション実験による熱力学的効果発現機構の解明」 Competitive

伊賀由佳

System: 基盤研究（B）

2016/04 - 2019/03
「液滴衝撃によるエロージョンの要因解析」 Competitive

伊賀由佳

Offer Organization: 株式会社東芝電力・社会システム技術開発センター

System: 共同研究

2018/02 - 2019/02

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分子動力学計算を用いて液滴衝撃によるエロージョン量の支配要因を解析する。
Challenge to air-cooling fin for electronic device with exceeding 1MW/m2 of heat flux

Maruyama Shigenao

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2016/04/01 - 2018/03/31

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To realize a high heat flux air cooling system for the electronics cooling, low temperature supersonic flow, which was generated by an adiabatic expansion, and micro-channel were applied to micro-heat exchanger. The boundary layer thickness, which is related with an amount of heat transfer, is decreasing with the downscale. At first, the flow field and heat transfer in the micronozzle which has the suitable shape for manufacturing were evaluated by numerical simulation. Furthermore, the heat sink with micronozzle was manufactured and its cooling performance was evaluated by experiment. The effectiveness of micronozzle was clarified by the comparing experiment with heat sink without micronozzle. The heat sink with micronozzle showed the cooling performance of 0.761MW/m2 in the condition of 0.3MPaG of inlet pressure and 80 degree C of heat transfer surface.
「冷媒のキャビテーション騒音に関する研究」 Competitive

伊賀由佳

Offer Organization: 株式会社デンソー基盤技術開発部

System: 共同研究

2017/09 - 2018/03

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膨張弁内に発生するキャビテーションおよび水撃が、固体壁面に与える影響について明らかにし、カーエアコン起動時の冷媒騒音の低減につながる知見を得る。
「回転翼のキャビテーション不安定抑制に関する研究」 Competitive

伊賀由佳

Offer Organization: 独立行政法人宇宙航空研究開発機構(JAXA), 川崎聡

System: 共同研究

2015/04 - 2018/03

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回転翼のキャビテーション不安定に関する抑制技術の獲得、及び解析精度向上の研究。
「CFDおよびキャビテーション解析技術に関する基礎研究」 Competitive

伊賀由佳

Offer Organization: 日立建機株式会社

System: 共同研究

2015/04 - 2018/03

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油中キャビテーションを対象とした流体解析技術構築。
「溶存気体効果を考慮した革新的キャビテーション相変化モデルの開発」 Competitive

伊賀由佳

System: 挑戦的萌芽研究

2015/04 - 2017/03
「高温水キャビテーションにおける熱力学的効果と寸法効果に関する実験的研究」 Competitive

伊賀由佳

System: 公益財団法人畠山文化財団

2015/04 - 2016/03
「スクリュープロペラのキャビテーション予測技術の研究」 Competitive

伊賀由佳

Offer Organization: 株式会社本田技術研究所汎用R＆Dセンター

System: 共同研究

2014/12 - 2015/12

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小型ボード用スクリュープロペラにおけるキャビテーションの発生を汎用数値解析コードを用いて，高精度に予測する手法を検討する．
「翼端漏れ渦キャビテーションの熱力学的効果」 Competitive

伊賀由佳

Offer Organization: 青山学院大学, 姜東赫

System: 公募共同研究

2015/04 -

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液体ロケットインデューサで発生する翼端漏れ渦キャビテーションの中の温度計測を行い，三次元大規模構造を有するキャビテーションでの熱力学的効果について検討する．
Study of air cooling to remove high heat flux of 10MW/m2

MARUYAMA Shigenao, KOMIYA Atsuki, IGA Yuka, OKAJIMA Junnosuke

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2013/04/01 - 2015/03/31

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To achieve an air cooling system high heat flux for the electronics cooling, the supersonic air flow with low temperature, which was generated by an adiabatic expansion, and micro-channel were applied to micro-heat exchanger. By using a microchannel, the boundary layer thickness decreases and convective heat transfer coefficient is improved. The density distributions of the supersonic air flow inside the micro-channel, which was impossible to measure by conventional technique, were visualized and measured by using phase-shifting interferometer. From the comparison between the results of experimental and calculated, the cooling performance was evaluated. Then, it was evaluated as 1.5 MW/m2 despite the sir cooling.
Research on Hybrid Peening and Its Application for Suppression of Hydrogen Embrittlement

SOYAMA Hitoshi, IGA Yuka, TAKAKUWA Osamu, AOYAGI Yoshiteru

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

2012/04/01 - 2015/03/31

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In order to suppress of hydrogen embrittlement of metallic materials, which is an obstacle to realize hydrogen society, “hybrid peening” was established. Here, “hybrid peening” means a mechanical surface treatment which combined with different peening method such cavitation peening, laser peening and shot peening. In the present research, suppression of hydrogen embrittlement of chrome molybdenum steel and stainless steel by the peening was demonstrated by experimentally. It was also revealed that the peening reduced invention of hydrogen into metallic materials by introducing compressive residual stress into the materials and the peening suppressed the hydrogen embrittlement of the metallic materials.
「高温高圧キャビテーションタンネル実験による熱力学的効果の解明に関する研究」 Competitive

伊賀由佳

System: ターボ機械協会小宮研究助成金

2014/04 - 2015/03
「キャビテーション微細気泡群における熱力学的効果の基礎特性解明」 Competitive

伊賀由佳

Offer Organization: 金沢工業大学, 新井山一樹

System: 公募共同研究

2012/04 - 2015/03

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キャビテーションの蒸発時に潜熱の移動により温度が低下することによってキャビテーションの発生が抑制される熱力学的効果についての数値解析モデルを構築し，数値シミュレーションを行う．
「流体機械性能予測・壊食予測への応用も考慮したキャビテーション流れ解析技術に関する研究」 Competitive

伊賀由佳

Offer Organization: 株式会社荏原製作所

System: 共同研究

2012/04 - 2013/03

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キャビテーションによる流体機械の性能低下の予測、ならびに壊食の予測を可能とする流れ解析技術の確立。
“Advancement of Numerical Method for Unsteady Cavitating Flows” Competitive

伊賀由佳

Offer Organization: 北京理工大学, 王国玉

System: 公募共同研究

2011/04 - 2012/03

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In the present research, applicant and BIT collaborators will perform benchmark simulation of cavitating flows around a same single hydrofoil based on our experimental data. Through the comparison between each result, we clarify the problems of the numerical method and models and aim to advance the numerical method for cavitation.
キャビテーションサージに関するＣＦＤ解析 Competitive

伊賀由佳

Offer Organization: 独立行政法人宇宙航空研究開発機構(JAXA)

System: 公募共同研究

2010/04 - 2011/03

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液体ロケットエンジン開発時に実験場で発生した音響共振によるキャビテーションサージ現象を数値解析において再現し，再現のための上流音速について検討する．
「液体ロケットインデューサの振動問題に関する研究」 Competitive

伊賀由佳

Offer Organization: 独立行政法人宇宙航空研究開発機構(JAXA), 吉田義樹

System: 公募共同研究

2009/04 - 2010/03

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液体ロケットエンジンにとって、インデューサはターボポンプの吸い込み性能と安全性を確保するための重要な構成要素である。このインデューサには作動条件によって、キャビテーション不安定現象と呼ばれる振動現象が発生し、ポンプ性能の低下や故障の原因となることが知られている。キャビテーション不安定現象はその振動特性や発生原因によりいくつかの種類に分類されているが、その中には発生メカニズムの解明されていないものや、分類も不明瞭な現象が残っており、これらの解決は世界各国の液体ロケットエンジン開発者にとって重要な課題となっている。本共同研究では、実際のターボポンプ開発現場に身を置く開発員と、学術的研究機関に身を置く研究者との間での情報交換・交流により、現象理解を深め、技術の高度化を図ることを目的としている。
Effort to reuse of the liquid rocket turbopump -Numerical analysis of cryogenic cavitation-

IGA Yuka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2009 - 2010

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Cavitation occurs inescapably in inlet of turbopump of liquid rocket engine, because the liquid oxygen and hydrogen turbopumps are downsized and made as high-horsepower to the utmost limit. The cavitation sometimes yields cavitation instability, which is undesirable oscillation of the pump induced by mutual interference between the unsteady characteristics of cavitation and the pump system. The cavitation instability induces the declaration of efficiency or damage in the pump. In the present study, in an effort to reuse of the liquid rocket, the numerical method for the cavitation instability and cavitation erosion is attempted to be develop especially in a cryogenic environment such as liquid hydrogen and oxygen.
「音響共振と連成するキャビテーションサージに関する研究」 Competitive

伊賀由佳

Offer Organization: 独立行政法人宇宙航空研究開発機構(JAXA), 吉田義樹

System: 共同研究

2008/04 - 2009/03

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極気液二相均質媒体モデルによる入口配管部液中音響共振の数値解析手法を構築し、キャビテ−ションサ−ジを解析してこれまでのＪＡＸＡ内での実験結果と比較検証を行い、タ−ボポンプの動特性を把握する技術を高度化する。
「キャビテーションの熱力学的効果に関する研究」 Competitive

伊賀由佳

Offer Organization: 独立行政法人宇宙航空研究開発機構（JAXA）

System: 共同研究

2005/04 - 2008/03

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極低温流体中で発生するキャビテーションの熱力学効果の物理モデルを構築し、数値解析によって、キャビテーションの熱力学効果に起因する諸現象を解明する。
Study of Cavitation and the Thermodynamic Effect by Using Cryogenic/SupercritiGal Gas-liquid Two-phase Model

IGA Yuka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2007 - 2008
「スリット翼列効果を用いたキャビテーション不安定現象の新しい抑制手法の開発」 Competitive

伊賀由佳

Offer Organization: 北京理工大学, 王国玉

System: 共同研究

2005/10 - 2007/03

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液体ロケットインデューサの不安定振動であるキャビテーション不安定現象をインデューサの翼にスリットを設けることにより抑制する手法の開発を行う．
極低温キャビテーション流れの数値解析モデルの開発

伊賀由佳

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究(B)

Institution: 東北大学

2005 - 2006

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研究最終年度である本年度は,日本の液体ロケットエンジンHIIAの酸化剤として用いられている液体酸素に対して,広範囲の温度および圧力条件下において厳密な数学的モデリングを行った熱力学パラメータを数値計算コードへと組み込み,ClarkY11.7%翼形まわりの二次元キャビテーション流れで検証計算を行った.その結果,モデル式の解の存在範囲等の影響により,依然として数値計算コードに不安定性が残ること確認した.また,厳密な熱力学パラメータモデルを用いた極低温流体の数値解析と平行して,簡便な熱力学的効果モデルの検証計算を行った.流れ場には,熱力学的効果の小さい常温水(270K)と熱力学的効果の比較的大きい高温水(340K)における三枚周期平板翼列流れを用いた.その結果,非定常キャビテーションの熱力学的効果の解析における我々の厳密な熱力学モデルの有効性を確認した. 一方,極低温キャビテーション流れとの比較のためのターボ機械内部流特性の詳細なデータ取得を目的に,水一空気系の翼列内部において発生する非定常キャビテーションの流動解析を更に進めた.特に,キャビテーションサージ特性に関する研究では,キャビテーションサージ発生時の脈動現象における圧力波伝播のメカニズムについて解明した.さらに,線形理論におけるキャビテーションサージの発生条件式や振動周波数式等の数値解析への適用の有効性について議論した.具体的には,非線形理論におけるキャビテーションの動的特性パラメータを数値解析結果から算出する方法を2つ提案し,そのうち,2つの非線形データのそれぞれの時間平均の差から線形理論における微小変動量を評価する方法が有効であることを見出した.
Development of Numerical Simulation Method for Unsteady Cavitating Flow

IKOHAGI Toshiaki, IGA Yuka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2002 - 2004

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In this study, on the occasion of design and development of fluid machineries such as turbopump of liquid rocket engine, a numerical method that can clarify unsteady characteristics of high-speed cavitating flowfields in detail was developed to come into practical use. The numerical method can treat mixture condition for liquid and gas phases and for regions of low Mach number and supersonic flows in cavitating flow all at once. Through numerical analyses about several kinds of flowfields with cavitation, availability of the method is verified. 3D unsteady cavitating flow around single hydrofoil was analyzed numerically by using the present method. It was found that shedding cloud cavity has 3D large-scale structure of U-shaped vortex by the influence of a boundary layer developed on the channel sidewalls. In analyses of flat-plate cascade flow, two kinds of mechanism in break-off phenomenon of sheet cavity were predicted depending on cascade arrangement. In analyses of flat-plate cascade with three-blade cyclic condition, it was showed that three kinds of typical cavitation instabilities, such as forward rotating cavitation, rotating-stall cavitation and cavitation surge, which usually occur in turbopump were represented numerically. The present method can predict above three unstable phenomena without additional modeling corresponding to the respective phenomena. Through analyses of tandem three-blade cascade flow, through an investigation of slit effect between front and rear blades in tandem cascade on cavitating flowfield, it was showed clearly that occurrence of cavitation instabilities can be reduced by influence of a slit flow that increases irregularity of cavitation periodicity. In analyses of cavitating water jet injected into air, it was clarified that impact pressure by collapse of cavity cloud in nozzle induces large-scale deformation of water jet interface.

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Teaching Experience 5

応用流体力学　東北大学大学院
流体力学Ⅱ　東北大学
自然界の構造　東北大学
基幹科目自然界の構造　東北大学
流体力学Ⅲ　東北大学

Social Activities 10

機械の日2021年記念講演

2021/01/12 - 2021/08/09
日立Astemoオンライン講演

2021/03/21 - 2021/03/21
メカジョ未来フォーラム2021（オンライン）

2020/08/01 - 2021/01/29
メカジョ未来フォーラム2020（コロナで中止）

2019/09/01 - 2020/03/06
メカジョ未来フォーラム2019

2018/09/01 - 2019/03/08
液体ロケットエンジンターボポンプの研究

仙台Ⅰゾンタクラブ 1月例会講演(卓話)

2019/01/15 -
液体ロケットエンジンターボポンプの研究

サイエンス・デイ2018 知のフォーラム賞受賞記念講演会計画（仙台二華中学校への講演会）

2018/12/01 -
液体ロケットエンジンとキャビテーション

八戸高専講演会

2018/11/01 -
夢、未来、宙－宇宙航空業界で働くというコト－

東北大学流体科学研究所75周年記念事業主催宙女講演会（女子学生向けセミナー）

2018/09/08 -
液体ロケットエンジン・ターボポンプインデューサの研究～下町ロケットを目指して～

女子高校生のためのミニフォーラム「工学にかける私の夢」

2016/07/28 -

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Academic Activities 31

浸水被害軽減に向けた地下空間活用勉強会委員

2023/03/09 - Present
河川機械設備革新的技術研究開発推進委員

2022/12/19 - Present
河川機械設備小委員会委員

2021/10/25 - Present
河川分科会委員

2021/10/25 - Present
JAXA角田宇宙センター主幹研究開発員（クロスアポイントメント）

2019/10 - Present
第21回キャビテーションに関するシンポジウム実行委員

2023/12/07 - 2023/12/08

Activity type: Academic society, research group, etc.
社会資本整備審議会専門委員

2021/10/25 - 2023/10/24
RCTEMME2021 International Scientific Committee

Hanoi, Vietnam

2021/12/10 - 2021/12/12

Activity type: Academic society, research group, etc.
第20回キャビテーションに関するシンポジウム現地実行委員長

仙台

2021/12/09 - 2021/12/10

Activity type: Academic society, research group, etc.
IAHR-ASIA2021 International Technical Committee

Kathmanz, Nepal

2021/11/22 - 2021/11/23

Activity type: Academic society, research group, etc.
AICFM16 Local Organizing Committee

Yokohama, Japan

2021/09/13 - 2021/09/15

Activity type: Academic society, research group, etc.
混相流シンポジウム2021実行委員

大坂

2021/08/22 - 2021/08/24

Activity type: Academic society, research group, etc.
18th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery Scientific Committee

Honolulu, Hawaii

2020/11/23 - 2020/11/26

Activity type: Academic society, research group, etc.
文部科学省/ 科学技術・学術政策研究所(NISTEP)科学技術予測センター専門調査員

2019/04 - 2020/03

Activity type: Academic research
15th Asian International Conference on Fluid Machinery International Technical Committee

Busan, Korea

2019/09/25 - 2019/09/27

Activity type: Academic society, research group, etc.
2nd IAHR-Asia Symposium on Hydraulic Machinery and System International Technical Committee

Busan, Korea

2019/09/24 - 2019/09/25

Activity type: Academic society, research group, etc.
3rd Intenational Syposium of Cavitation and Multiphase Flow International Technical Committee

Shanghai

2019/04/19 - 2019/04/22

Activity type: Academic society, research group, etc.
JAXA宇宙科学研究所（ISAS）/ 宇宙工学委員会委員

2015/04 - 2019/04
ターボ機械協会創立45周年記念式典および仙台講演会現地実行委員長

仙台

2018/10/11 - 2018/10/12

Activity type: Other
29th IAHR Symposium on Hydraulic Machinery and Systems 実行委員（論文担当）

2018/09/17 - 2018/09/21

Activity type: Academic society, research group, etc.
女子学生向けセミナー「夢、未来、宙－宇宙航空業界で働くというコト－」企画・運営

東北大学河内北キャンパスマルティメディア教育研究棟

2018/09/08 - 2018/09/08

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東北大学流体科学研究所75周年記念事業主催宙女講演会
混相流シンポジウム2018 実行委員

仙台

2018/08/08 - 2018/08/10

Activity type: Academic society, research group, etc.
女子高校生のためのミニフォーラム「工学にかける私の夢」講演

東北大学青葉山キャンパス中央棟

2016/07/28 - 2016/07/28

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講演タイトル「液体ロケットエンジン・ターボポンプインデューサの研究～下町ロケットを目指して～」
日本機械学会東北支部講演会実行委員（総務）

仙台

2013/03/15 - 2016/03/11

Activity type: Academic society, research group, etc.
日本流体力学会年会2014 実行委員（幹事）

仙台

2014/09/15 - 2014/09/17

Activity type: Academic society, research group, etc.
可視化情報シンポジウム2014 セッションオーガナイザー(OS11: キャビテーションの可視化・計測・解析)

東京

2014/07/21 - 2014/07/22

Activity type: Academic society, research group, etc.
可視化情報シンポジウム2013 セッションオーガナイザー(OS13: キャビテーションの可視化・計測・解析)

東京

2013/07/16 - 2013/07/17

Activity type: Academic society, research group, etc.
第50回日本伝熱シンポジウム実行委員

仙台

2013/05/29 - 2013/05/31

Activity type: Academic society, research group, etc.
JAXA角田宇宙センター/ 客員研究員（客員教授）

2008/04 - 2012/03
第14回キャビテーションに関するシンポジウム実行委員（幹事）

仙台

2009/03/19 - 2009/03/20

Activity type: Academic society, research group, etc.
第54回ターボ機械協会仙台講演会実行委員

仙台

2005/10/07 - 2005/10/07

Activity type: Academic society, research group, etc.

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