2022 Fiscal Year Final Research Report
Diagnostics of Internal Compressible Flows based on Nozzle Temperature (Temperature Recovery Factor in Flows with Shockwave)
| Project/Area Number |
20K04270
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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 | Kagoshima University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 圧縮性流体 / 超音速ノズル / コールドスプレー |
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| Outline of Final Research Achievements |
The temperature recovery factor calculated from the measured wall pressure and nozzle wall temperature is found to be 0.835. Therefore, the value is used to diagnose the internal flows in this study. The stagnation temperature of the working gas was elevated by about 10 degrees by electric heating.
The experimental results show that Mach number measured from the present method agrees well for 0 < x < 140mm, where x = 0 is the throat position. However, for x > 140mm, Mach number measured from the present method is lower than that measured from the wall static pressure. This discrepancy will be attributed to the insufficient heating of the stagnation chamber.
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| Free Research Field |
圧縮性流体力学
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| Academic Significance and Societal Importance of the Research Achievements |
ノズル外表面温度から内部流れを診断する方法は申請者が考案したもので，流路に静圧孔や観測窓を設ける必要がない．そのため，大小様々な研究用の管路や実稼働している管路に適用することができる．加えて，熱電対や赤外線カメラで流路の温度を測定すればよいため，安価な測定法である．本研究の結果，流路の出口近傍を除いて本診断法は内部流れのマッハ数を適切に測定できることが分かった．ノズル出口近傍については測定結果に誤差が生じる原因を明らかにするとともに，本診断法をさらに改良する必要がある．
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