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Transition to global instability in transverse-jet shear layers

Published online by Cambridge University Press:  27 July 2010

J. DAVITIAN ,
D. GETSINGER ,
C. HENDRICKSON  and
A. R. KARAGOZIAN
J. DAVITIAN
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA
D. GETSINGER
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA
C. HENDRICKSON
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA
A. R. KARAGOZIAN*
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095-1597, USA
*
†Email address for correspondence: [email protected]
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Abstract

In a recent paper (Megerian et al., J. Fluid Mech., vol. 593, 2007, pp. 93–129), experimental exploration of the behaviour of transverse-jet near-field shear-layer instabilities suggests a significant change in the character of the instability as jet-to-crossflow velocity ratios R are reduced below a critical range. The present study provides a detailed exploration of and additional insights into this transition, with quantification of the growth of disturbances at various locations along and about the jet shear layer, frequency tracking and response of the transverse jet to very strong single-mode forcing, creating a ‘lock-in’ response in the shear layer. In all instances, there is clear evidence that the flush transverse jet's near-field shear layer becomes globally unstable when R lies at or below a critical range near 3. These findings have important implications for and provide the underlying strategy by which active control of the transverse jet may be developed.

JFM classification

Instability: Absolute/convective instability Wakes/Jets: Jets Wakes/Jets: Shear layers
Type
Papers
Information
Journal of Fluid Mechanics , Volume 661 , 25 October 2010 , pp. 294 - 315
Copyright
Copyright © Cambridge University Press 2010

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References

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