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Shintaro Sato

Section

Graduate School of Engineering

Job title

Assistant Professor

Degree

博士（工学）（東北大学）
修士（工学）（東北大学）

researchmap

https://researchmap.jp/sato_shin

J-GLOBAL ID

201901011664706234

Research History 2

2019/10 - Present

Tohoku University　Graduate School of Engineering, Department of Aerospace Engineering
2018/04 - 2019/09

日本学術振興会特別研究員（DC２）

Education 3

Tohoku University　Graduate School of Engineering　Department of Aerospace Engineering

2017/04 - 2019/09
Tohoku University　Graduate School of Engineering　Department of Aerospace Engineering

2015/04 - 2017/03
Tohoku University　Faculty of Engineering　Department of Mechanical and Aerospace Engineering

2011/04 - 2015/03

Research Areas 3

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Fluid engineering /
Energy / Basic plasma science /
Aerospace, marine, and maritime Engineering / Aerospace engineering /

Papers 26

Role of surface discharge dynamics in the generation of electrohydrodynamic force: toward performance improvement of dielectric barrier discharge plasma actuators Invited Peer-reviewed

Shintaro Sato, Naofumi Ohnishi

Journal of Physics D: Applied Physics　58　(14)　143002-143002　2025/02/20
Publisher: IOP Publishing
DOI： 10.1088/1361-6463/adb3af 　

ISSN： 0022-3727

eISSN： 1361-6463

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Abstract Dielectric barrier discharge (DBD) plasma actuators are devices that actively control the airflow using nonequilibrium atmospheric-pressure plasmas, showing promise for practical applications in the field of aerospace engineering. Numerous studies have revealed the dynamics of surface discharge and the process of generating electrohydrodynamic (EHD) force in detail. The performance of DBD plasma actuators has improved continuously over the past 20 years. However, there is a need for further improvement in EHD force generation to enable the practical applications of DBD plasma actuators. In this review, we provide insights that contribute to the development of a high-performance DBD plasma actuator by reviewing previous studies focused on revealing the surface discharge and EHD force generation processes. The foundations of the discharge process in DBD plasma actuators are briefly described from the perspectives of experiments and numerical simulations. We also reviewed various strategies for improving EHD force generation by optimizing the geometric structure and the applied voltage waveform as well as by controlling the surface charge accumulation. Improving EHD force generation and its efficiency is a fundamental research area to realize the practical applications of a novel active airflow control device that uses nonequilibrium plasmas.
Application of proper orthogonal decomposition to flow fields around various geometries and reduced-order modeling Peer-reviewed

Yuto Nakamura, Shintaro Sato, Naofumi Ohnishi

Computer Methods in Applied Mechanics and Engineering　432　117340-117340　2024/12
Publisher: Elsevier BV
DOI： 10.1016/j.cma.2024.117340 　

ISSN： 0045-7825
Dynamic instability in lift-type reentry capsule at supersonic flow Peer-reviewed

Yasuhito Okano, Shintaro Sato, Hiroki Nagai, Naofumi Ohnishi

Physics of Fluids　36　(7)　2024/07/01
Publisher: AIP Publishing
DOI： 10.1063/5.0217605 　

ISSN： 1070-6631

eISSN： 1089-7666

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Numerical simulations were conducted to investigate dynamic instability of a Japanese lift-type reentry capsule, which is named H-II transfer vehicle Recovery Vehicle (HRV), at Mach 1.2 by comparing two capsule shapes of an original HRV model and a model with a different shoulder angle of 10°. The 10° model has a thicker aft-body with a smaller shoulder angle than the original model. A previous pitch-direction One-Degree Of Freedom (1DOF) experiment revealed that the original model was dynamically stable, whereas the 10° model was dynamically unstable at Mach 1.2. So as to reproduce the same trends as the experiment, a high-order numerical scheme and zonal detached eddy simulation were employed. In fixed angle simulations, we found that the static longitudinal stability of the 10° model is higher than that of the original model in contrast with the observed dynamic stability. 1DOF free oscillation simulations successfully reproduced the same trends as the experiment. We elucidated that the main factor of the dynamic instability of the HRV-type capsule is a hysteresis of a boundary layer separation on the upper side of the capsule. The hysteresis is induced by a variation of momentum in a boundary layer due to capsule motion. We also found that for HRV-type capsules, the lower the static stability within the statically stable range, the higher the dynamic stability might be. In addition, on the lower side, a sign of the work exerted by surrounding flow is different between the original model and the 10° model. A dynamic mode decomposition analysis indicated that the vortex structures on the capsule wake might induce this difference.
Proper orthogonal decomposition method of constructing a reduced-order model for solving partial differential equations with parametrized initial values Peer-reviewed

Yuto Nakamura, Shintaro Sato, Naofumi Ohnishi

Partial Differential Equations in Applied Mathematics　100654-100654　2024/02
Publisher: Elsevier BV
DOI： 10.1016/j.padiff.2024.100654 　

ISSN： 2666-8181
Ionic wind generation through coplanar discharge: A plasma actuator without exposed electrodes Peer-reviewed

Shintaro Sato, Mahoro Sakurai, Naofumi Ohnishi

AIP Advances　13　(6)　2023/06/01
Publisher: AIP Publishing
DOI： 10.1063/5.0150335 　

eISSN： 2158-3226

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This study demonstrates the successful induction of a unidirectional ionic wind by adding an embedded electrode in a coplanar discharge, thus breaking the generation of a symmetrical electric field. The strategy for the ionic wind generation is based on separating the ionization process and the charged-particle acceleration process. Conventional plasma actuators used to induce an ionic wind typically incorporate exposed electrodes that pose a risk of unexpected airflow disturbance and reduce durability due to oxidation. However, the coplanar discharge-based, exposed-electrodeless plasma actuator developed in this study overcomes these issues. The coplanar discharge generates a diffused and uniform surface discharge, a desirable attribute for plasma actuators. The ionic wind velocity generated by this coplanar discharge plasma actuator is comparable to that generated by conventional plasma actuators when applying a square-waveform bias voltage to the additional electrode. Furthermore, this study emphasizes the significance of the phase difference between the repetitive pulses for generating coplanar discharge and the square-waveform voltage for accelerating the charged particles.
Numerical simulation of atmospheric-pressure surface dielectric barrier discharge on a curved dielectric with a curvilinear mesh Peer-reviewed

Hideto Tamura, Shintaro Sato, Naofumi Ohnishi

Journal of Physics D: Applied Physics　56　(4)　045202-045202　2023/01/26
Publisher: IOP Publishing
DOI： 10.1088/1361-6463/aca61d 　

ISSN： 0022-3727

eISSN： 1361-6463

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Abstract A numerical simulation method for atmospheric-pressure surface dielectric barrier discharge (DBD) is presented using a structured curvilinear mesh that is fitted to a curved dielectric surface. The numerical method is based on the plasma fluid model with general coordinate transformation, which is widely used in the field of the computational fluid dynamics. The calculations of a potential distribution formed by a line electrode and a planar surface DBD are performed to confirm the validity of the proposed method. We conducted numerical simulations of the DBD on a wavy surface using the proposed method to investigate the characteristics of the DBD on a curved surface. The propagation velocity of the discharge front and the electric field strength of the discharge front changed depending on the surface shape. The proposed method enables the calculation of the DBD on a complex surface and widens the application range of the numerical simulation in the field of discharge physics.
The Effect of SiC-MOSFET Characteristics on the Performance of Dielectric Barrier Discharge Plasma Actuators with Two-Stroke Charge Cycle Operation Peer-reviewed

Shintaro Sato, Tomoki Yoshikawa, Naofumi Ohnishi

Actuators　11　(11)　333-333　2022/11/17
Publisher: MDPI AG
DOI： 10.3390/act11110333 　

eISSN： 2076-0825

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The low-voltage operation of a dielectric-barrier-discharge (DBD) plasma actuator with a simple electric circuit has the potential to put it into industrial applications. However, there is an issue that the efficiency of the low-voltage operated DBD plasma actuator is lower than that of the high-voltage operated one. In this study, the characteristics of silicon carbide (SiC) metal-oxide-semiconductor field-effect transistors (MOSFETs), which are used in the electric circuit, are investigated with a focus on the on-state resistance. The on-state resistance of the SiC-MOSFET affects the rise time of the applied voltage in our experimental condition. The energy consumption by applying a pulse voltage to the DBD plasma actuator increases with increasing the on-state resistance. Flow visualization with particle image velocimetry measurement reveals that a DBD plasma actuator with the SiC-MOSFET whose on-state resistance is the lowest induces the highest velocity of the ionic wind. Also, low on-state resistance is preferable in terms of the thrust-to-power ratio. These findings contribute to the development of an optimal power supply for DBD plasma actuators for industrial applications.
Enhancement of electrohydrodynamic force with AC bias voltage in three-electrode dielectric barrier discharge plasma actuators

Shintaro Sato, Mahoro Sakurai, Naofumi Ohnishi

Journal of Applied Physics　132　(11)　113301-113301　2022/09/21
Publisher: AIP Publishing
DOI： 10.1063/5.0100696 　

ISSN： 0021-8979

eISSN： 1089-7550

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A novel dielectric barrier discharge (DBD) plasma-actuator module with an exposed electrode and two covered electrodes was developed to enhance electrohydrodynamic force generation based on the concept that it separates the ionization and acceleration processes. The conventional three-electrode configuration of the DBD plasma actuator suffers from unexpected spark discharge between the exposed electrodes, thereby failing to strengthen the electric field intensity for accelerating charged particles or generating a stable ionic wind. In this study, a third electrode was embedded in the dielectric layer to prevent spark discharge. Furthermore, an alternating current (AC) waveform was employed as the bias voltage, which was applied to the third electrode, instead of the direct current (DC) voltage used in a conventional DBD plasma actuator. Induced flow visualization using particle image velocimetry technique revealed that the DC bias voltage forms a weak ionic wind in the proposed DBD plasma actuator owing to the electric field screening effect, and the ionic wind periodically appears when the polarity of the voltage is reversed by applying an AC-bias voltage. The velocity of the ionic wind increases with increasing frequency and the AC bias voltage amplitude. Also, decreasing the distance between the second and third electrodes results in ionic wind enhancement. The results obtained in this study provide insights into the drastic improvement in the performance of DBD plasma actuators with the enhancement of the electric field intensity for charged particle acceleration.
Fabrication and performance evaluation of full-inkjet-printed dielectric-barrier-discharge plasma actuators Peer-reviewed

Shintaro Sato, Kazuki Nishida, Toshimitsu Hirai, Masaki Ito, Hirofumi Teramae, Masaki Matsubara, Kiyoshi Kanie, Naofumi Ohnishi

Sensors and Actuators A: Physical　344　113751-113751　2022/09
Publisher: Elsevier BV
DOI： 10.1016/j.sna.2022.113751 　

ISSN： 0924-4247
Surface-charge control strategy for enhanced electrohydrodynamic force in dielectric barrier discharge plasma actuators Peer-reviewed

Shintaro Sato, Kodai Mitsuhashi, Tomoki Enokido, Atsushi Komuro, Akira Ando, Naofumi Ohnishi

Journal of Physics D: Applied Physics　54　(45)　455203-455203　2021/08/06
Publisher: IOP Publishing
DOI： 10.1088/1361-6463/ac1b5d 　

ISSN： 0022-3727

eISSN： 1361-6463
Connections between the modes of a nonlinear dynamical system on a manifold Peer-reviewed

Shintaro Sato, Hiroki Sakamoto, Naofumi Ohnishi

Physical Review E　103　(6)　2021/06/09
Publisher: American Physical Society (APS)
DOI： 10.1103/physreve.103.062210 　

ISSN： 2470-0045

eISSN： 2470-0053
Development of a flexible dielectric-barrier-discharge plasma actuator fabricated by inkjet printing using silver nanoparticles-based ink Peer-reviewed

Shintaro Sato, Tomoki Enokido, Kenichiro Ashikawa, Masaki Matsubara, Kiyoshi Kanie, Naofumi Ohnishi

Sensors and Actuators A: Physical　112823-112823　2021/05
Publisher: Elsevier BV
DOI： 10.1016/j.sna.2021.112823 　

ISSN： 0924-4247
Fabrication of a multi-stage plasma synthetic jet actuator using printed electronics Peer-reviewed

Shintaro Sato, Tomoki Enokido, Naofumi Ohnishi

AIP Advances　11　(4)　045105-045105　2021/04/01
Publisher: AIP Publishing
DOI： 10.1063/5.0047709 　

eISSN： 2158-3226
Development of small high-voltage AC power supply for a dielectric barrier discharge plasma actuator Peer-reviewed

Kento Suzuki, Atsushi Komuro, Shintaro Sato, Mahoro Sakurai, Kodai Mitsuhashi, Natsuko Sekiya, Yayoi Watanabe, Keito Kanagawa, Akira Ando

Review of Scientific Instruments　92　(2)　024707-024707　2021/02/01

DOI： 10.1063/5.0015377 　

ISSN： 0034-6748

eISSN： 1089-7623
Numerical Analysis of Shock Speed Attenuation in Expansion Tube

Hiroki Sakamoto, Shintaro Sato, Naofumi Ohnishi

AIAA Scitech 2021 Forum　2021/01/11
Publisher: American Institute of Aeronautics and Astronautics
DOI： 10.2514/6.2021-0058 　
Performance Improvement of Dielectric Barrier Discharge Plasma Actuator with Two-Stroke Cycle Operation

Shintaro Sato, Tomoki Enokido, Kenichiro Ashikawa, Naofumi Ohnishi

AIAA Scitech 2021 Forum　2021/01/11
Publisher: American Institute of Aeronautics and Astronautics
DOI： 10.2514/6.2021-1492 　
Computational Study of Discharge Process in Plasma Actuator for Enhanced Electrohydrodynamic Force Generation toward Low-Voltage Operation Peer-reviewed

Shintaro SATO, Haruki FURUKAWA, Masayuki TAKAHASHI, Naofumi OHNISHI

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN　19　(1)　17-23　2021
Publisher: Japan Society for Aeronautical and Space Sciences
DOI： 10.2322/tastj.19.17 　

ISSN： 1884-0485

eISSN： 1884-0485
Experimental demonstration of low-voltage operated dielectric barrier discharge plasma actuators using SiC MOSFETs Peer-reviewed

Shintaro Sato, Yuta Ozawa, Atsushi Komuro, Taku Nonomura, Keisuke Asai, Naofumi Ohnishi

Journal of Physics D: Applied Physics　53　(43)　2020/06/29

DOI： 10.1088/1361-6463/aba0e1 　

ISSN： 0022-3727

eISSN： 1361-6463
A fast solver of plasma fluid model in dielectric-barrier-discharge simulation Peer-reviewed

Shintaro Sato, Takashi Shiroto, Masayuki Takahashi, Naofumi Ohnishi

Plasma Sources Science and Technology　29　(7)　2020/06/09
Publisher: IOP Publishing
DOI： 10.1088/1361-6595/ab9b18 　

ISSN： 0963-0252

eISSN： 1361-6595
Discharge process and gas heating effect in nanosecond-pulse-driven plasma actuator

Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

AIAA Scitech 2019 Forum　2019
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
DOI： 10.2514/6.2019-1001 　
Successively accelerated ionic wind with integrated dielectric-barrier-discharge plasma actuator for low-voltage operation Peer-reviewed

Sato Shintaro, Furukawa Haruki, Komuro Atsushi, Takahashi Masayuki, Ohnishi Naofumi

Scientific Reports　9　5813　2019

DOI： 10.1038/s41598-019-42284-w 　

ISSN： 2045-2322
Induced flow simulation with detailed discharge modeling in dielectric-barrier-discharge plasma actuator

Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

AIAA Aerospace Sciences Meeting, 2018　(210059)　2018
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
DOI： 10.2514/6.2018-1293 　
Computational Study of Body Force Production Process and Performance Improvement in Dielectric-Barrier-Discharge Plasma Actuator Peer-reviewed

Sato Shintaro, Takahashi Masayuki, Ohnishi Naofumi

Transactions of the Japan Society for Aeronautical and Space Science, Aerospace Technology Japan　16　550　2018

DOI： 10.2322/tastj.16.550 　
Enhanced electrohydrodynamic force generation in a two-stroke cycle dielectric-barrier-discharge plasma actuator Peer-reviewed

Shintaro Sato, Masayuki Takahashi, Naofumi Ohnishi

APPLIED PHYSICS LETTERS　110　(19)　194101　2017/05

DOI： 10.1063/1.4983370 　

ISSN： 0003-6951

eISSN： 1077-3118
Inuence of voltage waveform on electrohydrodynamic force in a dielectric-barrier-discharge plasma actuator

Shintaro Sato, Naofumi Ohnishi

AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting　2017
Publisher: American Institute of Aeronautics and Astronautics Inc.
DOI： 10.2514/6.2017-1804 　
Theoretical modeling of pulse discharge cycle in dielectric barrier discharge plasma actuator Peer-reviewed

Shintaro Sato, Naofumi Ohnishi

JAPANESE JOURNAL OF APPLIED PHYSICS　55　(7)　07LD04　2016/07

DOI： 10.7567/JJAP.55.07LD04 　

ISSN： 0021-4922

eISSN： 1347-4065

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Misc. 2

S0530103 Numerical Analysis of Pulse Discharge Process in DBD Plasma Actuator

SATO Shintaro, OHNISHI Naofumi

Mechanical Engineering Congress, Japan　2015　"S0530103-1"-"S0530103-5"　2015/09/13
Publisher: The Japan Society of Mechanical Engineers

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Dielectric barrier discharge (DBD) plasma actuator has been investigated for decades because of its advantages compared to existing flow-control devices. Periodic current pulses are observed when intermittent discharges occur by applying a time-varying voltage. We have conducted two-dimensional simulations of the DBD plasma actuator with a drift-diffusion model. The discharge regime can be classified into two phases. In the first phase, a positive ion cloud is formed at the edge of the exposed electrode due to electron avalanche. A simple theoretical model is proposed, which takes into account time evolution of electron number density at the edge of the exposed electrode using the first Townsend ionization coefficient and provides a good agreement with the result of the numerical simulation. In the second phase, the cloud expands along the dielectric surface, followed by the streamer propagation at a high velocity. The period of streamer discharge cycle becomes shorter as the voltage slope increases. The simulation result shows that the period of the first phase is inversely proportional to the voltage slope, while that of the second phase is inversely proportional to the square of the voltage slope.
Theoretical analysis of pulse interval in DBD plasma actuator

46　5p　2015/04/16
Publisher: 日本航空宇宙学会

Research Projects 8

航空機の空力設計を変革する革新的流体低次元モデルの幾何学的定式化

佐藤慎太郎

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 若手研究

Institution: 東北大学

2024/04 - 2029/03
Drastic Acceleration of Fluid Simulation Using Combination of Low-Dimensional and High-Dimensional Models

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: RICOS Co. Ltd.

2024/06 - 2027/03
電荷制御に基づく革新的イオン風生成技術によるエアロイオニクスの確立

大西直文, 佐藤慎太郎

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2024/04 - 2027/03
アポステリオリ流体幾何学の創出

佐藤慎太郎

Offer Organization: 科学技術振興機構

System: 戦略的創造研究推進事業さきがけ

2021/10 - 2025/03
Establishment of active airflow control system based on unsteady aerodynamics

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

Category: Grant-in-Aid for Early-Career Scientists

Institution: Tohoku University

2021/04 - 2024/03
表面電荷制御による革新的流体制御技術の確立

大西直文, 佐藤慎太郎, 蟹江澄志, 野々村拓, 松野隆, 小室淳史

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(A)

Category: 基盤研究(A)

Institution: 東北大学

2020/04/01 - 2023/03/31

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以前より取り組んでいた小型化・多電極化によるプラズマアクチュエータ（PA）の低電圧化に引き続き取り組み，多電極化した PA の段を追うごとに加速されていることが PIV（Particle Image Velocimetry）で確認でき，期待通りの性能が 1.5 kV 程度の直流電圧と高速スイッチだけで得られた．次に，印刷電極によって小型化・多電極化した PA の性能評価を行った．銀ナノインクを用いて電極をインクジェット印刷した後，銅メッキすることで，従来の銅テープを用いた電極と同程度の抵抗値に抑えつつ，電極厚さが小さく加工精度の高い電極を誘電体上に製作することができた．性能評価は PIV による流速の測定，および放電による電磁ノイズの影響を受けにくい振り子式推力計による推力計測を行った．いずれの結果も従来の銅テープ電極を用いた性能に劣るどころか，むしろ性能が向上する結果を得た．走査電子顕微鏡で電極端を観察したところ，印刷電極には印刷時の濡れ性に起因した湾曲構造があり，これと電極厚さが小さくなったことが放電特性を向上させ，結果として気流生成能力も向上させた可能性を示唆している．また，表面電荷を計測するために，ポッケルス素子を用いた表面電位センサの開発を行った．その結果，一般的な表面バリア放電における電位の時空間変化を計測することに成功し，印加する電圧の正負の極性の違いにより誘電体表面の帯電分布に変化が生じることが分かった．さらに，鋸歯電極にした場合のプラズマアクチュエータの誘起速度をシングルピクセル PIV 技術を利用して計測した．鋸歯電極にした場合，誘起速度が安定して高くなることを確認した．またプラズマアクチュエータのバースト駆動による誘起流れを PIV で測定し，パラメータによって流れ場の分類ができることを明らかにした．
無人航空機のロバスト化に向けたプラズマアクチュエータによる流れの時空間的能動制御 Competitive

佐藤慎太郎

Offer Organization: 日本学術振興会

System: 特別研究員奨励費

2018/04 - 2020/03
誘電体表面電荷制御に基づく低電圧作動プラズマアクチュエータの開発-小型模型飛行機を用いた実証実験- Competitive

佐藤慎太郎

Offer Organization: 村田学術振興財団

System: 研究助成

2019 -

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