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Interferometric test for N-wave flow

Published online by Cambridge University Press:  28 March 2006

D. H. Steininger  and
F. D. Bennett
D. H. Steininger
Affiliation:
Ballistic Research Laboratories, Aberdeen Proving Ground, Maryland
F. D. Bennett
Affiliation:
Ballistic Research Laboratories, Aberdeen Proving Ground, Maryland
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Abstract

An analytical expression for the fringe shift in the N-wave is derived from the improved linearized theory for a slender supersonic projectile. From this expression an approximate mapping function is found which gives a simple test for N-wave flow. The validity of the fringe-shift expression is quantitatively confirmed by measuring an interferogram of the flow around a sphere. N-wave flow is shown to exist around a small sphere for r greater than about 70 diameters. Measurements of the shock waves from a sphere and a cone-cylinder show that the shocks assume their asymptotic positions for r > 14 diameters for the sphere, and r > 7 diameters for the cone-cylinder.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 2 , Issue 3 , May 1957 , pp. 209 - 236
Copyright
© 1957 Cambridge University Press

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