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Nonequilibrium finite-rate carbon ablation model for earth reentry flows

Document Type

Article

Publication Date

3-2016

Abstract

There is considerable uncertainty in the application of many well-known surface kinetic models to predict carbon ablation rates for Earth reentry. Alba et al. [1] compared cyanogen (CN) shock-layer radiation predicted by two of the more common finite-rate ablation models found in the literature with ultraviolet (UV) spectrometer measurements in the X-2 expansion tunnel at the University of Queensland. The experiments used a pure graphite model tested in 8.5  km/s Earth entry flow at surface temperatures ranging from 1770 to 2410 K. The first ablation model was due to the work of Park [2–5] and it was found to provide reasonable comparisons at the higher considered surface temperatures only if the nitridation reaction efficiency was lowered by two orders of magnitude. The second ablation model was due to Zhluktov and Abe [6] (ZA) and it consistently underpredicted the radiation intensities except at a surface temperature of 1770 K, where there was excellent agreement. The most interesting result was that both ablation models were insensitive to the considered surface temperatures and, respectively, predicted similar radiance profiles for each case.

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Source Publication

Journal of Spacecraft and Rockets (ISSN 0022-4650 | eISSN 1533-6794)

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