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An investigation of supersonic oscillatory cavity flows driven by thick shear layers

Published online by Cambridge University Press:  04 July 2016

X. Zhang  and
J. A. Edwards
X. Zhang
Affiliation:
Department of Engineering, University of Cambridge
J. A. Edwards
Affiliation:
Department of Engineering, University of Cambridge
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Abstract

Flows around two-dimensional rectangular cavities driven by thick shear layers are investigated experimentally at two supersonic Mach numbers (Me = 1.5 and 2.5) to show the effects of variations in Mach number and length to depth ratio of the cavity. Flow oscillation is observed in the cavity. The characteristics of the oscillatory behaviour are determined by Mach number and the length of depth ratio of the cavity, as well as the shear layer spanning the cavity. Two oscillatory mechanisms can be identified: one in which a strong trailing-edge vortex and vortices which are shed from the leading-edge interact, the other in which a transverse oscillation of a single vortex occurs within the cavity. Changes in the time-dependent and the time-mean flow characteristics at different flow conditions are discussed.

The time-dependent experimental results are compared with existing theoretical analyses of the frequencies. For one of these characteristic types of oscillation, the longitudinal oscillation, an existing theoretical description is improved with a modified phase relation.

Type
Research Article
Information
The Aeronautical Journal , Volume 94 , Issue 940 , December 1990 , pp. 355 - 364
Copyright
Copyright © Royal Aeronautical Society 1990 

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Footnotes

†

Now in the Department of Aeronautics and Astronautics, The University, Southampton

‡

Now in the College of Aeronautics, Cranfield

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