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Instability of wake-dominated compressible mixing layers

Zhuang, Mei and Dimotakis, Paul E. (1995) Instability of wake-dominated compressible mixing layers. Physics of Fluids, 7 (10). pp. 2489-2495. ISSN 1070-6631. http://resolver.caltech.edu/CaltechAUTHORS:ZHUpof95

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Abstract

The instability of supersonic mixing layers, with velocity profiles possessing a wake component, is investigated using linear, inviscid, spatial theory. The mean-velocity profile is represented by a hyperbolic-tangent profile plus a wake component. Such profiles are encountered in the initial region of experimental supersonic shear-layer flows, as well as in envisaged hypersonic propulsion systems in which ingested boundary layers generate substantial wake components. Shear-layer and wake instability modes previously found in incompressible mixing layers are also found in compressible mixing layers. The existence of a wake component in the velocity profile renders the mixing layer more unstable at all free-stream Mach numbers. For convective Mach numbers exceeding unity, the shear-layer mode splits into two supersonic modes, and the mixing layer becoming more unstable with increasing wake deficit. The wake mode becomes less unstable and eventually stable with increasing compressibility, i.e., increasing convective Mach numbers.


Item Type:Article
Additional Information:Copyright © 2006 American Institute of Physics. Received: 26 July 1994; accepted: 5 June 1995. We would like to acknowledge our discussions with Professor T. Kubota and many helpful comments by Professor M. Koochesfahani and M. Slessor. This work was supported by the Air Force Office of Scientific Research, Grant Nos. B-0155 and F49620-94-l-0353.
Subject Keywords:COMPRESSIBLE FLOW; INSTABILITY; MACH NUMBER; MIXING; SUPERSONIC FLOW; SHEAR FLOW; WAKES
Record Number:CaltechAUTHORS:ZHUpof95
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:ZHUpof95
Alternative URL:http://dx.doi.org/10.1063/1.868692
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6007
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:13 Nov 2006
Last Modified:26 Dec 2012 09:17

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