Accurate molecular and soot infrared radiation model for high-temperature flows

T. Ozawa, M. B. Garrison, D. A. Levin

Research output: Contribution to journalArticlepeer-review


The accurate computation of infrared spectral radiation from high-temperature, nonequilibrium flows remains a challenging problem, particularly for polyatomic species and particulates. A versatile computer model for calculating the infrared radiation of water and carbon dioxide and soot in generic flowfields is proposed and examined. Molecular radiation is calculated using the high-resolution transmission absorption molecular database/ high-temperature spectroscopic absorption parameters and carbon dioxide spectroscopic databank-1000 line-by-line databases to provide high-resolution, accurate spectra between 200 and 8200 cm-1. Soot particulate radiation is modeled using the first-term approximation of Mie scattering theory, and the pseudogas approximation is used. The program was parallelized in spectral increments to run efficiently on a message-passing interface equipped cluster. Validation was performed against well-documented radiation models such as ATHENA and nonequilibrium air radiation - infrared. Soot radiative properties were validated against measurements made on a sooting diffuse laminar flame, and carbon dioxide spectra were validated against experimental data. The computer radiation model is applied to two situations: a nonequilibrium bow shock and an Atlas-like sooting plume.

Original languageEnglish (US)
Pages (from-to)19-27
Number of pages9
JournalJournal of thermophysics and heat transfer
Issue number1
StatePublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Space and Planetary Science


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