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EVOLUTION AND GROWTH OF LARGE SCALE STRUCTURES IN HIGH COMPRESSIBILITY MIXING LAYERS

Tobias Rossmann
Department of Mechanical Engineering, Stanford University Stanford, California 94305-3032 USA

M. Godfrey Mungal
Mechanical Engineering Department, Stanford University, Stanford, CA 94305; Dean, School of Engineering, Santa Clara University, Santa Clara, CA 95053, USA

Ronald K. Hanson
High Temperature Gasdynamics Laboratory, Mechanical Engineering Department, Stanford University, Stanford, CA 93405

Abstract

The basic physical mechanisms for shear layer growth have been shown in computations to change at very high compressibilities. A double diaphragm, shock tunnel driven hypersonic mixing layer facility is used to reach compressibility levels not possible in blowdown-type facilities. Mixing layers at Mc = 0.8 and 1.7 are examined in streamwise, plan, and end views using Schlieren and acetone PLIF imaging schemes. Analysis of these images yields normalized shear layer growth rates, concentration information on the fast side of the shear layer, and visualization of the behavior of large scale structures. Normalized growth rate data is reported for Mc = 0.8 − 2.7 as derived from averaged schlieren images.