Characteristic and mechanism of pressure fluctuation caused by self-induced oscillation of supersonic impinging jet
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When the underexpanded supersonic jet impinges on the obstacle, it is well known that the self-induced flow oscillation occurs. This oscillation depends on the pressure ratio in the flowfield, the position of an obstacle and is related with the noise problems of aeronautical and other industrial engineering. The characteristic and the mechanism of self-induced flow oscillation, have to be clarified to control various noise problems. But, it seems that the characteristics of the oscillated flowfield and the mechanism of an oscillation have to be more cleared to control the oscillation. This paper aims to clarify the effect of the pressure ratio and the obstacle position and the mechanism of self-induced flow oscillation by numerical analysis and experiment, when the underexpanded supersonic jet impinges on the cylindrical body. From the result of this study, it is clear that occurrence of the self-induced flow oscillation depends on the pressure balance in the flowfield.
KeywordsSupersonic Jet Mach Disk Barrel Shock Flow Oscillation Flow Visualization Numerical Analysis
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- Aratani, S., Ojima, H. and Takayama, K.: The Observation of Supersonic Jets from Nozzles during the Glass Tempering Process, Proceedings of 2nd Symposium on High Speed Photography and Photonics, Sendai, pp.11–20, (1995).Google Scholar
- Katanoda, H. and Fukuhara, M.: Numerical Study on Supersonic Impinging Jet from Cold Spray Nozzle, Proceeding of 12 ACFM, (CD-ROM), (2008).Google Scholar
- Yasunobu, T., Otobe, Y. and Kashimura, H.: Effect of Pressure Ratio for Self-Induced Flow Oscillation of Underexpanded Supersonic Jet Impinging Cylindrical Body, Theoretical and Applied Mechanics Japan, Vol.58, pp.197–203, (2009).Google Scholar