Modelling radiative properties of gas mixtures in nonequilibrium high-altitude rocket plumes
Résumé
This paper presents the development of a Statistical Narrow Band model (SNB) in a nonequilibrium vibrational state for HCl and CO molecules. The population densities of the energy levels are obtained by a multi-temperature approach to compute nonequilibrium Line By Line (LBL) spectra. The SNB parameters are obtained by fitting the curves of growth from the LBL approach by a least squares error minimization using a Newton method for pure Lorentz and Doppler broadening regimes. The model is tested in Voigt broadening regime using a mixing rule and agrees well with the LBL approach. Finally, spectral correlation problems between η_σ /κ_σ and κ_σ , where η_σ and κ_σ are the emission and absorption coefficients respectively, have been exhibited for CO_2 .
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