Multi-scale k-distribution model for gas mixtures in hypersonic nonequilibrium flows

Ankit Bansal, M. F. Modest, D. A. Levin

Research output: Contribution to journalArticlepeer-review


A k-distribution model is presented for gas mixtures in thermodynamic nonequilibrium, 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. The 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).

Original languageEnglish (US)
Pages (from-to)1213-1221
Number of pages9
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Issue number7
StatePublished - May 2011
Externally publishedYes


  • Hypersonics
  • Nonequilibrium
  • Plasma radiation

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy


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