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Active cancellation of pure tones in an excited jet

Published online by Cambridge University Press:  20 April 2006

H. Arbey  and
J. E. Ffowcs Williams
H. Arbey
Affiliation:
Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ Permanent address: Laboratoire de Mécanique des Fluides, Ecole Centrale de Lyon, 69131 Ecully, France.
J. E. Ffowcs Williams
Affiliation:
Cambridge University Engineering Department, Trumpington Street, Cambridge CB2 1PZ
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Abstract

This paper describes the results of experiments conducted on a circular jet simultaneously excited by two different acoustic tones. By varying the phase between two signals at harmonically related frequencies, control can be exercised on the process of harmonic generation – sometimes the process being virtually destroyed. This is shown to be so for both harmonic and subharmonic generation, but the latter is more difficult to control.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 149 , December 1984 , pp. 445 - 454
Copyright
© 1984 Cambridge University Press

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