马赫数1.95超声速欠膨胀喷流声辐射数值分析

doi:10.7527/S1000-6893.2015.0365

Abstract

Abstract:

Acoustic radiation from a supersonic underexpanded jet with a designed exit Mach number 1.95 is investigated using large eddy simulation (LES). By comparing the statistical results of the mean flow and the turbulence fluctuation of the jet, we verify the accuracy of the numerical method. We carry out a detailed analysis of the flow characteristic of the supersonic jet flow, and pay particular attention to the interaction between shock-cell and turbulence. According to the correlation between jet dynamic and its acoustic field, the features and generation mechanisms of Mach wave radiation and broad band shock associated noise from the jet are carefully analyzed. Numerical results show the shear layer dynamic evolution and the interaction between shock-cell and turbulence constitute the major noise sources of the supersonic underexpanded jet.

Key words: supersonic underexpanded jet, Mach wave radiation, broadband shock noise, shock-turbulence interaction, large eddy simulation

CLC Number:

V411.3

FENG Feng, GUO Li, WANG Qiang. Numerical investigation of acoustic radiation from Mach number 1.95 supersonic underexpanded jet[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(11): 3273-3283.

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Numerical investigation of acoustic radiation from Mach number 1.95 supersonic underexpanded jet

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