Modeling of high-temperature air species nonequilibrium spectral radiation properties

The correlated multitemperature coupled-vibration-dissociation (CMTCVD) model was used to calculate the nonequilibrium population distribution of vibrational energy levels. The high-temperature equilibrium or nonequilibrium air species absorption coefficient is an important parameter for the calculation of reentry vehicle radiation properties, heat shielding, and aerodynamic flowfield. The CMTCVD model is combined with the three-temperature model and the contribution of various radiation transition processes of 11 species in air is directly calculated based on the atomic and molecular theory. The comparisons with experimentally measured data and NEQAIR's results indicate that the model is applicable when calculating air radiation properties of thermal equilibrium or nonequilibrium.