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The influence of higher harmonics on vortex pairing in an axisymmetric mixing layer

Published online by Cambridge University Press:  26 April 2006

R. A. Petersen  and
R. C. Clough
R. A. Petersen
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, AZ 85721 Present address: Jet Propulsion Laboratory, Pasadena, CA 91109, USA.
R. C. Clough
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, AZ 85721 Present address: Rocketdyne Division, Rockwell International, Canoga Park, CA 91304, USA.
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Abstract

Strong forcing was used to produce vortex pairing in a submerged axisymmetric water jet. Phase-averaged hot-wire measurements were combined with phase-averaged flow visualization to identify the relevant nonlinear interactions. The leading resonant interaction was not a subharmonic resonance. Instead it was a triad resonance involving the subharmonic, the fundamental and the 3/2 harmonic. The profound influence of higher harmonics on the amplification of the fundamental and subharmonic was demonstrated in a systematic way by successive truncation of the Fourier series representation of the excitation waveform.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 239 , June 1992 , pp. 81 - 98
Copyright
© 1992 Cambridge University Press

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