Calculation of Gas Dynamics and Radiation of High-Altitude Jets

A method for calculating high-altitude jets exhausting into a rarefied gas has been developed. This method is based on the use of quasi-gas-dynamic (QGD) equations. The solution of quasi-gasdynamic equations requires the use of significantly smaller computer resources as compared with the methods of direct numerical simulation. The equations of the continuity of gas mixture components and the equations for vibrational energies transfer in the quasi-gas-dynamic formulation were obtained from the Boltzmann equation. It was shown that when calculating with the use of QGD, the radiation intensity is significantly lower than when calculating the standard system of Navier‒Stokes equations (NS). This is due to the decrease in temperature (translational, rotational and vibrational) in the mixing layer.