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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

FLOW BEHAVIOR OF SUPERSONIC IMPINGING MOIST AIR JETS

pages 447-452
DOI: 10.1615/TSFP6.700
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摘要

Pronounced aeroacoustic resonances are exhibited in the flowfield where a jet emerges from an orifice or a nozzle and impinges on a solid surface. One instance where such resonances are produced is in a high speed jet impingement, such as in the space launch vehicle systems, multi-stage rocket separation, jet-engine exhaust impingement, terrestrial rocket launch, and in the next generation short take off and vertical landing (STOVL) aircraft, etc. Supersonic impinging jets produce a highly unsteady flowfields leading to a drastic increase of noise level with very high dynamic pressure loads and thermal loads on nearby surfaces. These high-pressure, high-temperature and acoustic loads are also accompanied by dramatic lift loss, severe ground erosion and hot gas ingestion to the inlet in the jet engines aircraft. Previous studies of supersonic impinging jets suggest that the highly unsteady behavior of the impinging jets is due to a feedback loop between the fluid and acoustic fields, which leads to these adverse effects. In actual jet flow, the working gas may contain condensable gas such as steam or moist air. In these cases, the non-equilibrium condensation may occur at the region between nozzle exit and an object. The jet flow with non-equilibrium condensation may be quite different from that without condensation. Therefore, in this study, the effect of the non-equilibrium condensation of moist air on the axisymmetric under-expanded supersonic impinging jet on a vertical flat plate was investigated numerically.

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