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Controlled interactions in a forced axisymmetric jet. Part 2. The modulation of broadband turbulence

Published online by Cambridge University Press:  26 April 2006

R. A. Petersen  and
T. A. Long
R. A. Petersen
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, AZ 85721, USA Current address: Jet Propulsion Laboratory, Pasadena, CA 91109, USA.
T. A. Long
Affiliation:
Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, AZ 85721, USA
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Abstract

Incoherent turbulent motion modulated by coherent large-scale motion contributes to second-order coherent stresses. The spatial distribution of wave-induced stress was measured in a jet whose cross-section had been distorted through controlled resonant interactions between two forced, helical waves spinning in opposite directions. The transfer of energy from the coherent motion to broadband turbulence is documented. Shape assumptions are examined by comparing radial distributions to predictions from linear, inviscid stability theory. Control over small-scale mixing is examined by demodulating the coherent envelope of small-scale turbulence and by correlating it with features of the coherent, large-scale motion. Coherent production is shown to be associated with the roll-up process and there is evidence of secondary, inflexional instabilities.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 235 , February 1992 , pp. 57 - 72
Copyright
© 1992 Cambridge University Press

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