State-to-state modeling of radiation coupled to vibration-translation relaxation and dissociation in nonequilibrium gas flows

A radiation model is developed to obtain evolution of band intensities according to the state-to-state (STS) approach by considering vibration-translation and vibration-electronic jumps and dissociation. Investigation of the behavior of a nonequilibrium N-2 gas flow behind a shock shows that the radiation intensity remains weak and the flow is far from radiative equilibrium. Similar intensities are predicted by pure STS and hybrid approaches based on existing radiation models. However, the coupling between physicochemical and radiative processes increases with radiation intensity.