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Shock attenuation in a ‘gradual’ area expansion

Published online by Cambridge University Press:  29 March 2006

M. A. Nettleton
M. A. Nettleton
Affiliation:
Central Electricity Research Laboratories, Leatherhead, Surrey
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Abstract

The effect of the angle of divergence ϕ, the magnitude of the area ratio A21 and the specific-heat ratio of the gas γ on the attenuation of a shock in a two-dimensional area expansion has been experimentally determined. The results are compared with current theories relating shock strength and area ratio. At some distance from the expansion the change in shock strength, for shocks with strengths up to 10, is predicted reasonably accurately by an analysis of Chisnell (1957). Close to the area change surprisingly strong shocks were observed. This is shown to result from the diffracted shock undergoing a Mach reflexion at the end of the expansion.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 60 , Issue 2 , 4 September 1973 , pp. 209 - 223
Copyright
© 1973 Cambridge University Press

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