A wavelet transform analysis applied to unsteady aspects of supersonic jet screech resonance |
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Authors: | S H Walker S V Gordeyev F O Thomas |
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Institution: | (1) Department of Aerospace and Mechanical Engineering University of Notre Dame Notre Dame, IN 46556, USA, US |
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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.
Received: 9 February 1996 / Accepted: 17 June 1996 |
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