Numerical analysis of 3D rarefied supersonic jet of molecular nitrogen on the base of the generalized Boltzmann equation

The supersonic rarefied jet of molecular nitrogen issued from a rectangular slit into vacuum is studied on the base of numerical solution of the Generalized Boltzmann Equation that includes rotational degrees of freedom of molecules. The fields of density, translational and rotational temperatures, and the rotational spectrum at some locations inside the jet are presented. The effect of "freezing" of rotational temperature and the non-equality of diagonal components of the temperature tensor are observed. The shape of the distribution function of the first rotational level in a selected location is shown.