Accession Number : AD0286173

Title :   EVAPORATIVE FILM COOLING AT HYPERSONIC VELOCITIES FOR RE-ENTRY VEHICLES

Corporate Author : MINNESOTA UNIV ROSEMOUNT ROSEMOUNT AERONAUTICAL LABS

Personal Author(s) : HERMANN,RUDOLF ; MELNIK,W.L.

Report Date : APR 1961

Pagination or Media Count : 1

Abstract : A theoretical analysis of similarity parameters of evaporative film cooling was developed for blunt bodies indicating the effect of mass transfer on heat transfer and skin friction for Prandtl and Lewis numbers unity. Calculated interface temperatures are in good agreement with wall temperatures measured around a hemisphere in a hypersonic wind tunnel. Application of theANALYSIS SHOWS THAT EVAPORATIVE FILM COOLING IS FEASIBLE FOR TYPICAL RE-ENTRY VEHICLES. At circul r velocities the effective heat of evaporation of water i as high as 11,000 Btu/lbm. The significant advantage of evaporative film cooling is that the walls of a vehicle during re-entry are maintained at relatively low temperatures. (Author)

Descriptors :   *FILM COOLING, *REENTRY VEHICLES, ATMOSPHERE ENTRY, BLUNT BODIES, EVAPORATION, FEASIBILITY STUDIES, FRICTION, HEAT TRANSFER, HYPERSONIC CHARACTERISTICS, MODEL TESTS, TEMPERATURE, WIND TUNNEL MODELS

Distribution Statement : APPROVED FOR PUBLIC RELEASE