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Experiments on shock stand-off distance in non-equilibrium flow

Published online by Cambridge University Press:  29 March 2006

Peter P. Wegener  and
George Buzyna
Peter P. Wegener
Affiliation:
Department of Engineering and Applied Science, Yale University, New Haven, Connecticut
George Buzyna
Affiliation:
Department of Engineering and Applied Science, Yale University, New Haven, Connecticut
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Abstract

An experimental investigation of the non-equilibrium behaviour of the shock stand-off distance ahead of spheres at low supersonic Mach number is reported. An intermittent wind tunnel operating with a reacting gas mixture with one non-equilibrium mode is described. A non-equilibrium parameter after Damköhler is determined for the flow and the experiments cover a range of this variable from near-frozen to near-equilibrium states. The shock stand-off distance is measured and found to vary as expected between these two bounds with a low value at equilibrium. With all other variables governing shock standoff distance held constant, such measurements can also be used to determine the relaxation time of the non-equilibrium mode.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 37 , Issue 2 , 23 June 1969 , pp. 325 - 335
Copyright
© 1969 Cambridge University Press

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