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On the transition between regular and Mach reflection in truly non-stationary flows

Published online by Cambridge University Press:  20 April 2006

S. Itoh ,
N. Okazaki  and
M. Itaya
S. Itoh
Affiliation:
Department of Mechanical Engineering of Kyushu Sangyo University, Fukuoka, Japan
N. Okazaki
Affiliation:
Department of Mechanical Engineering of Kyushu Sangyo University, Fukuoka, Japan
M. Itaya
Affiliation:
Department of Mechanical Engineering of Kyushu Sangyo University, Fukuoka, Japan
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Abstract

Shock reflections over a convex and a concave wedge were investigated by using a 5 × 7 cm ordinary pressure-driven shock tube. Dry air was used for both the driving and driven gases. The large difference between the transition from regular (RR) to Mach reflection (MR) and that from MR to RR was observed, confirming the results obtained by Ben-Dor, Takayama & Kawauchi (1980). These results contradict all of the previous theoretical transition criteria. A new theory on the transition between RR and MR was developed by applying Whitham's ‘ray shock’ theory. This new theory agrees quite well with the experimental results.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 108 , July 1981 , pp. 383 - 400
Copyright
© 1981 Cambridge University Press

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