A wavelet transform analysis applied to unsteady aspects of supersonic jet screech resonance

被引：0
|
作者：
S. H. Walker
S. V. Gordeyev
F. O. Thomas
机构：
[1] Department of Aerospace and Mechanical Engineering University of Notre Dame Notre Dame,
[2] IN 46556,undefined
[3] USA,undefined
来源：
Experiments in Fluids | 1997年 / 22卷
关键词：
Shear Layer; Velocity Fluctuation; Wavelet Transformation; Mode Switching; Fourier Space;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
 The multiple acoustic modes and shear layer instability waves which characterize a supersonic underexpanded rectangular jet are investigated experimentally via the Morlet wavelet transform. Because of its quasi-locality in both physical-space and Fourier space, the wavelet transformation allows one to track the time evolution of the various scales in both acoustic and velocity fluctuation signals. Using this technique it is demonstrated that multiple acoustic modes produced by the jet coexist and are not due to a mode switching mechanism. Unsteady screech tone modulation is observed and a mechanism for its occurrence is proposed.
引用
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页码：229 / 238
页数：9
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