Accession Number : AD0664597

Title :   HEAT TRANSFER RATES IN THE VICINITY OF SURFACE PROTUBERANCES AT MACH 6.3,

Corporate Author : GENERAL DYNAMICS/CONVAIR SAN DIEGO CALIF

Personal Author(s) : Baltakis,F. P.

Report Date : 10 MAR 1961

Pagination or Media Count : 34

Abstract : Wind tunnel tests were conducted to determine the effects of various protuberances on heat transfer rates to a flat surface. The protuberance models included three cylinders inclined 45 degrees backward, two cylinders inclined 45 degrees forward, two cylinders normal to the flow, one semicone-afterbody and one wedge-afterbody model. Tests were performed at Mach 6.3 and at gas total temperature of 4350R. The degree and the lateral extent of disturbances produced by cylindrical protuberances depend on the protuberance orientation with respect to the flow. Models inclined forward produced the highest heating rates while models inclined backward produced the lowest. Cylindrical protuberances inclined 45 degrees backward produced no significant increase in heating rates upstream of the models. Models in normal or forward facing orientation produced an increased heating rate area that extends approximately 2-1/2 protuberance diameters upstream. The highest heating rate region in the vicinity of cylindrical protuberances inclined 45 degrees backward occurred along the lines that are trailing the models at approximately 10 degrees with respect to the plate centerline. Cylindrical protuberances in normal and forward-facing attitudes produced the highest heating rates just upstream of the models. The highest heating rates, about 40 times the undisturbed value, occurred upstream of the forward-facing cylindrical protuberances. (Author)

Descriptors :   (*AIRCRAFT PROTUBERANCES, *HEAT TRANSFER), HYPERSONIC CHARACTERISTICS, WIND TUNNEL MODELS, MODEL TESTS, CYLINDRICAL BODIES, WEDGES, AFTERBODIES, AERODYNAMIC HEATING, FLAT PLATE MODELS

Subject Categories : Aerodynamics
      Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE