马赫数1.95超声速欠膨胀喷流声辐射数值分析
收稿日期: 2015-11-09
修回日期: 2015-12-25
网络出版日期: 2016-01-11
基金资助
国家自然科学基金（11302215）
Numerical investigation of acoustic radiation from Mach number 1.95 supersonic underexpanded jet
Received date: 2015-11-09
Revised date: 2015-12-25
Online published: 2016-01-11
Supported by
National Natural Science Foundation of China (11302215)
冯峰 , 郭力 , 王强 . 马赫数1.95超声速欠膨胀喷流声辐射数值分析[J]. 航空学报, 2016 , 37(11) : 3273 -3283 . DOI: 10.7527/S1000-6893.2015.0365
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.
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