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The glancing interaction of a Prandtl-Meyer expansion fan with a supersonic wake

Published online by Cambridge University Press:  04 July 2016

M. K. Smart  and
R. J. Stalker
M. K. Smart
Affiliation:
Department of Mechanical Engineering, University of Queensland, Australia
R. J. Stalker
Affiliation:
Department of Mechanical Engineering, University of Queensland, Australia
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Abstract

The glancing interaction of a Prandtl-Meyer expansion fan with a supersonic wake is examined. The particular supersonic wakes of interest are the combustion wake generated by a vertical strut injected scramjet, and the side wall boundary layer of a supersonic wind tunnel. A physical structure for the interaction is defined, and an approximate analysis of the downstream behaviour of the wake is presented. The phenomenon of wake over-turning by the glancing expansion fan is introduced, based on this analysis. This over-turning produces a high pressure zone on the expansion generating surface, which for the vertical strut injected scramjet, is part of the thrust nozzle. Combustion wake over-turning is suggested to be a major thrust producing mechanism in this form of scramjet.

Pressure measurements were taken on the expansion generating surface of a glancing interaction involving the side wall boundary layer of a small supersonic wind tunnel. Results from the analysis presented were found to be consistent with these measurements.

Type
Research Article
Information
The Aeronautical Journal , Volume 95 , Issue 942 , February 1991 , pp. 39 - 47
Copyright
Copyright © Royal Aeronautical Society 1991 

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Footnotes

*

Now at WBM Pty Ltd, Brisbane, Australia

References

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