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MULTI-SCALE k-DISTRIBUTION MODEL FOR GAS MIXTURES IN HYPERSONIC NONEQUILIBRIUM FLOWS

DOI: 10.1615/ICHMT.2010.RAD-6.330
14 pages

Ankit Bansal
The Pennsylvania State University, University Park, PA 16802 University of California, Merced, CA 95343

Michael F. Modest
School of Engineering, University of California, Merced, California, USA, 95343

D. A. Levin
Department of Aerospace Engineering, The Pennsylvania State University, University Park, PA 16802

Resumo

A k-distribution model is presented for gas mixtures in thermodynamic nonequilib¬rium, containing strongly radiating atomic species N and O together with molecular species of N2, N2+, NO and O2. In the VUV range of the spectrum there is strong absorption of atomic radiation by bands of N2. For this spectral range, a multi-scale model is presented, where RTEs are solved separately for each emitting species and overlap with other species is treated in an approximate way. Methodology for splitting the gas mixture into scales and evaluation of the overlap parameter between different scales is presented. Accuracy of the new model is demonstrated by solving the radiative transfer equation along the stagnation line flow field of the Crew Exploration Vehicle (CEV).

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