2022 Fiscal Year Final Research Report
Turbulent flow control based on wall pressure fluctuation field using high-density microphone array and focused ultrasound acoustic flow
| Project/Area Number |
19K04176
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 19010:Fluid engineering-related
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| Research Institution | Meiji University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 乱流 / 乱流計測 / 乱流制御 / 乱流の直接数値シミュレーション |
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| Outline of Final Research Achievements |
In this project, the following subjects have been clarified: (1) development of high-density microphone arrays for the measurement of wall pressure fluctuation field; (2) development of ultrasound acoustic flow actuator for turbulent flow control; (3) understanding the relation between wall pressure fluctuations and turbulence structures using a direct numerical simulation (DNS) database. For subject #1, we have developed a flexible microphone array that can be applicable to curved surfaces and a 60ch two-rows microphone array that can evaluate the spatial gradient field of wall pressure fluctuation. Regarding subject #2, an ultrasound acoustic flow generated by a strong acoustic pressure field that is formed by phased-array ultrasound transducers has been realized. For subject #3, clustering analysis to the turbulent channel flow DNS database is applied, and representative turbulence structures that can be associated with the strong wall pressure fluctuations has been clarified.
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| Free Research Field |
流体工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究で開発したマイクロフォンアレイによって乱流場の情報を壁面で計測可能な新たな手法の構築が進められた。超音波音響流アクチュエータについて、ハプティクス分野で開発・発展しているフェーズドアレイ集束超音波技術を流れの制御に応用する異分野融合の試みであり、今後さらなる発展が期待される。DNSデータベースを用いた壁面圧力変動と乱流構造の関係解明について、学術的に新たな視点としてクラスター解析を適用している。
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