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REVIEW ARTICLES: Compressible Free Mixing and Jet Noise Reduction

Methods for Enhanced Turbulence Mixing in Supersonic Shear Flows

[+] Author and Article Information
E. J. Gutmark, K. C. Schadow, K. H. Yu

Research Department, Naval Air Warfare Center, Weapons Division, China Lake CA 93555-6001

Appl. Mech. Rev 47(6S), S188-S192 (Jun 01, 1994) doi:10.1115/1.3124403 History: Online April 29, 2009

Abstract

Supersonic shear layers have inherent low mixing rates due to compressibility effects. Their mixing rate relative to subsonic shear layers can be up to 5 times lower. Several important technological applications which require intense mixing of supersonic flows gave impetus to research aimed to develop methods to enhance mixing in compressible flows with minimal performance penalty. This paper reviews some of these methods applied to both planar shear layers and jets. The methods are arranged in several categories: passive and active control of shear layer instabilities, three dimensional jets, generation of axial vorticity and shock interaction with shear layers. The paper concludes by discussing the importance of the wide range of length-scales in which turbulent mixing occurs.

Copyright © 1994 by American Society of Mechanical Engineers
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