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Ablation of carbonaceous materials in a hydrogen-helium arc-jet flowThe stagnation-point ablation rates of a graphite, a carbon-carbon composite, and four carbon-phenolic materials are measured in an arc-jet wind tunnel with a 50% hydrogen-50% helium mixture as the test gas. Flow environments are determined through measurements of static and impact pressures, heat-transfer rates to a calorimeter, and radiation spectra, and through numerical calculation of the flow through the wind tunnel, spectra, and heat-transfer rates. The environments so determined are: impact pressure approx. 3 atm, Mach number approx. 2.1, convective heat-transfer rate approx. 14 kw/sq cm, and radiative heat-transfer rate approx. 7 kw/sq cm in the absence of ablation. Ablation rates are determined from the measured rates of mass loss and recession of the ablation specimens. Compared with the predicted ablation rates obtained by running RASLE and CMA codes, the measured rates are higher by about 15% for all tested materials.
Document ID
19830015075
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Park, C. (NASA Ames Research Center Moffett Field, CA, United States)
Lundell, J. H. (NASA Ames Research Center Moffett Field, CA, United States)
Green, M. J. (NASA Ames Research Center Moffett Field, CA, United States)
Winovich, W. (NASA Ames Research Center Moffett Field, CA, United States)
Covington, M. A. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
March 1, 1983
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
A-9286
NAS 1.15:84346
NASA-TM-84346
Accession Number
83N23346
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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