A flowfield coupled excitation and radiation model for nonequilibrium reacting flows
Abstract
A secondorder method is developed to correct a radiative transfer analysis for possible local thermodynamic nonequilibrium (LTNE) effects. It uses a twospecies excitation model for nitrogen with chemical raction rates obtained from the Kunc and Soon (1989) atomic transition method. A vibrational energy equation is added to calculate a third temperature, which describes the average vibrational energy state of all the diatomic species. A new diffusional model is developed to improve the calculation of the diffusional fluxes of mass and energy, and secondorder radiative correction factors are developed for a twostep excitation model for atomic nitrogen. Radiation reaching the wall with the secondorder LTNE model shows a greater IRline contribution and less UVline center absorption than the firstorder one.
 Publication:

Space Manufacturing 8  Energy and Materials from Space
 Pub Date:
 June 1991
 Bibcode:
 1991aiaa.confR....G
 Keywords:

 Aerobraking;
 Aerothermodynamics;
 Computational Fluid Dynamics;
 Nonequilibrium Thermodynamics;
 Radiative Transfer;
 Reacting Flow;
 Energy Levels;
 Infrared Radiation;
 Line Spectra;
 Local Thermodynamic Equilibrium;
 Nitrogen;
 Reaction Kinetics;
 Ultraviolet Radiation;
 Vibrational Spectra;
 Thermodynamics and Statistical Physics