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

A wavelet transform analysis applied to unsteady aspects of supersonic jet screech resonance  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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

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

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Publisher
Springer-Verlag
Copyright
Copyright © 1997 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s003480050041
Publisher site
See Article on Publisher Site

Abstract

 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.

Journal

Experiments in FluidsSpringer Journals

Published: Jan 20, 1997

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