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Numerical Analysis of Convection/Transpiration CoolingAn innovative concept utilizing the natural porosity of refractory-composite materials and hydrogen coolant to provide CONvective and TRANspiration (CONTRAN) cooling and oxidation protection has been numerically studied for surfaces exposed to a high heat flux, high temperature environment such as hypersonic vehicle engine combustor walls. A boundary layer code and a porous media finite difference code were utilized to analyze the effect of convection and transpiration cooling on surface heat flux and temperature. The boundary, layer code determined that transpiration flow is able to provide blocking of the surface heat flux only if it is above a minimum level due to heat addition from combustion of the hydrogen transpirant. The porous media analysis indicated that cooling of the surface is attained with coolant flow rates that are in the same range as those required for blocking, indicating that a coupled analysis would be beneficial.
Document ID
Document Type
Technical Memorandum (TM)
Glass, David E. (NASA Langley Research Center Hampton, VA United States)
Dilley, Arthur D. (FDC/NYMA, Inc. Hampton, VA United States)
Kelly, H. Neale (Analytical Services and Materials, Inc. Hampton, VA United States)
Date Acquired
September 7, 2013
Publication Date
December 1, 1999
Subject Category
Fluid Mechanics and Thermodynamics
Report/Patent Number
NAS 1.15:209828
Funding Number(s)
CONTRACT_GRANT: F33657-93-C-2227
PROJECT: RTOP 242-33-03-20
Distribution Limits
Work of the US Gov. Public Use Permitted.

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NameType 20000012950.pdf STI