2023 Fiscal Year Final Research Report
Study of the three-dimensional structure of supersonic microjets by rainbow schlieren deflectometry
| Project/Area Number |
20K04272
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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 | The University of Kitakyushu |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 超音速流れ / 衝撃波 / 超音速噴流 / 流れの可視化計測 / レインボーシュリーレン偏向法 |
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| Outline of Final Research Achievements |
In this study, the three-dimensional structure of supersonic microjets emerging from convergent nozzles with circular and square cross sections was investigated experimentally and numerically by rainbow schlieren deflectometry and large eddy simulation. As a result, the shock-cell length, the supersonic length, the maximum Mach number in the jet and its position in the direction of flow, and the position of the Mach disk were determined as a function of the nozzle pressure ratio for the microjets from circular and rectangular nozzles. The flow fields of supersonic microjets from circular and square convergent nozzles in under-expanded conditions were found to exhibit unsteady characteristics of spiral modes.
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| Free Research Field |
圧縮性流体工学
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| Academic Significance and Societal Importance of the Research Achievements |
現時点において、円形および矩形超音速マイクロジェットの３次元密度場の取得に成功した研究報告は、国内および国外においても全くない。しかし、本申請者が開発した装置では、各種の断面形状をもつノズルからの超音速マイクロジェットに対して、高空間分解能で３次元の密度場を取得することが可能である。本研究の成果は次世代航空機用スクラムジェットエンジンの燃料噴射ノズルの効率化や他分野（冶金工学，農工業など）への波及を通じて，流体工学の発展と応用に貢献することが期待できる．
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