Stability of axisymmetric supersonic submerged microjet of nonequilibrium sulphur hexafluoride

Abstract

Abstract The influence of vibrational excitation and relaxation of molecules of gaseous sulphur hexafluoride (SF6) on the gas-dynamic structure and stability of high-velocity microjets flowing out of axisymmetric convergent micronozzles is studied numerically. The present numerical simulations are performed with allowance for vibrational relaxation of molecules with the use of a two-temperature model of relaxing flows by means of solving unsteady Navier-Stokes equations in a 3D formulation. The effects of vibrational relaxation of gas molecules on the gas-dynamic structure, intensity of disturbances, and length of the supersonic core of microjets are considered.