Accession Number : AD0600540

Title :   ASYMPTOTIC FLOW PATTERN OF A HYPERSONIC BODY.

Corporate Author : POLYTECHNIC INST OF BROOKLYN N Y

Personal Author(s) : Vaglio-Laurin,Roberto

Report Date : MAR 1964

Pagination or Media Count : 62

Abstract : A theoretical investigation of the steady, continuum, inviscid flow pattern at large distances downstream of finite hypersonic bodies is presented. Specifically, blunt nosed plates and cylinders representative of actual bodies and associated wakes are considered. Asymptotic solutions are obtained for perfect gas flows at infinite Mach number. It is shown that: (a) the flows in question are not self-preserving (automodel); (b) asymptotic description thereof can be obtained by the method of matched expansions in conjunction with standard matching principles; (c) the asymptotic behavior of the bow shock is described by the law y=a sub ox(m) 1+a sub 1 x (N sub 1+... with the exponent m=2/(3+nu), in accord with the blast wave analogy, and the exponent N sub 1=-m(1+nu) (gamma-1)/gamma, gamma being the isentropic exponent of the gas. Considerations are qualitatively extended to the analysis of flows at large but finite Mach numbers; it is indicated that a general feature thereof is the appearance of secondary trailing shocks for both twodimensional and axisymmetric configurations. (Author)

Descriptors :   (*HYPERSONIC FLOW, BLUNT BODIES), (*BLUNT BODIES, HYPERSONIC FLOW), HYPERSONIC CHARACTERISTICS, EQUATIONS, MATHEMATICAL ANALYSIS

Distribution Statement : APPROVED FOR PUBLIC RELEASE