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Experimental and computational study of laminar cavity flows at hypersonic speeds

Published online by Cambridge University Press:  07 February 2001

A. P. JACKSON ,
R. HILLIER  and
S. SOLTANI
A. P. JACKSON
Affiliation:
Department of Aeronautics, Imperial College of Science, Technology and Medicine, London, SW7 2BY, UK
R. HILLIER
Affiliation:
Department of Aeronautics, Imperial College of Science, Technology and Medicine, London, SW7 2BY, UK
S. SOLTANI
Affiliation:
Department of Aeronautics, Imperial College of Science, Technology and Medicine, London, SW7 2BY, UK Present address: Renault, Mecanique des Fluides et Combustion, France.
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Abstract

This paper presents a combined experimental/computational study of a surface cavity in a low Reynolds number Mach 9 flow. The geometry is based on a body of revolution, which produces highly two-dimensional time-averaged flow for all experimental test cases. A range of cavity length-to-depth ratios, up to a maximum of 8, is investigated. These correspond to ‘closed’ cavity flows, with the free shear layer bridging the entire cavity. For most cases the free shear layer is laminar. However, there is evidence of three-dimensional unsteadiness which is believed to be the consequence of Taylor–Görtler-type vortex formation. The effect of this is first detected on the cavity floor but progressively spreads as the cavity length is increased. For the longest cavities the flow is also influenced by the early stages of laminar–turbulent transition in the free shear layer.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 427 , 25 January 2001 , pp. 329 - 358
Copyright
© 2001 Cambridge University Press

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