Acta scientiarum naturalium Universitatis Pekinensis
SUN Zhili, YAN Dachun, NIE Jin
Experimental researches on coherent characteristics of sound generated by instability waves in the mixing layer of a planar jet under acoustic excitation are proceeded through the measurement of the coherent time scale. It demonstrates that the coherent time scale keeps a high level in the growing stage of coherent structures under the motivation of instability waves and then turning down abruptly at the breaking point where the large-scale eddies begin to shed downstream. It provides a criterion whether the instability wave or convective eddy becomes dominant in the contour map of the fluctuating velocity amplitude distribution with their particular expression of Lighthill stress.
SUN Zhili,YAN Dachun,NIE Jin. Coherent Acoustic Sources in the Mixing Layer of A Planar Jet[J].Acta scientiarum naturalium Universitatis Pekinensis, 2003, 39(1): 29-34.
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