Accession Number : AD0274535

Title :   VORTEX LOOPS IN THE TRAILS BEHIND HYPERVELOCITY PELLETS

Corporate Author : AVCO EVERETT RESEARCH LAB EVERETT MASS

Personal Author(s) : GOLDBERG,A. ; FAY,J.A.

Report Date : FEB 1962

Pagination or Media Count : 1

Abstract : The periodic shedding of vortices behind bluff bodies in subsonic flow at low Reynolds numbers is a well-known phenomenon. Self-luminous photographs of the hypervelocity trail behind spherical pellets in xenon at a free stream Mach number of about 25 are compared with those of dye-traced incompressible wakes. As a result it is postulated that, as in the subsonic case, vortex loop generation in the body base region is the controlling mechanism for transition to and development of the turbulent hypersonic wake. (Author)

Descriptors :   *HYPERSONIC FLOW, *HYPERVELOCITY PROJECTILES, *PELLETS, *SUBSONIC FLOW, *VORTICES, BLUNT BODIES, CONDENSATION TRAILS, HYPERSONIC CHARACTERISTICS, LUMINESCENCE, PHOTOGRAPHS, REYNOLDS NUMBER, TURBULENCE, WAKE, XENON

Distribution Statement : APPROVED FOR PUBLIC RELEASE