Wake structure of a 70 deg blunted cone, DSMC results and patterson probe measurements

摘要

The establishment of a vortex in highly nonequilibrium flow (non-Maxwellian distribution function of the translational degrees of freedom) in the wake of a 70 deg blunted cone under rarefied hypersonic conditions is investigated numerically by the DSMC method and experimentally by Patterson probe measurements. The experiments give detailed information on the molecular number fluxes. The experimental results are compared to DSMC calculations, which given even more detailed information on the distribution function. A vortex is formed in the wake of the cone for the two freestream conditions considered. On the axis of symmetry, the distribution function can be approximated by an ellipsoidal one.