Accession Number : AD0753109

Title :   Compact Transpiration Cooling Free-Jet Test Results and Comparison with Theory.

Descriptive Note : Technical memo.,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Newman,Robb W.

Report Date : OCT 1972

Pagination or Media Count : 78

Abstract : A series of free-jet tests has been carried out to obtain experimental data for use in evaluating the accuracy of a Compact Transpiration Cooling computer program. Nominal test conditions were Mach 2, 115 psia total pressure, and 500F total temperature. The test model was a flat plate with partially semicylinder leading edge; nitrogen gas was used as the transpirant. Tests were carried out for a wide range of coolant flow rates and the results correlated with theory. Good agreement was obtained between measured and computed results of plenum pressure variation, porous surface temperatures without transpiration cooling, and solid surface temperatures for all runs. However, the predicted temperatures for the stagnation line on the porous matrix surface were consistently lower than the measured values. (Author)

Descriptors :   (*AERODYNAMIC HEATING, *FILM COOLING), LEADING EDGES, COOLANTS, BOUNDARY LAYER, SUPERSONIC NOZZLES, ORIFICES, FLAT PLATE MODELS, HEAT TRANSFER

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE