APPLICATION OF THE DSMC METHOD TO HIGH-TEMPERATURE NONEQUILIBRIUM FLOWS WITH CHEMICAL REACTIONS

摘要

A novel approach to modeling high-temperature nonequilibrium dissociation in air with the DSMC method is proposed. Microscopic information on vibrationally specificrnreaction cross sections, which is necessary for suchrnmodeling, is determined numerically from known macroscopicrninformation on the dependence of the reactionrnrate constant on translational and vibrational temperatures. DSMC computations with the use of the calculated nitrogen and oxygen dissociation cross sectionsrnshow that the proposed model yields a correct reactionrnrate in vibrational-translational nonequilibrium. The usernof the new model in DSMC computations of high-altitudernaerothermodynamics results in obtaining a noticeably different flow structure and a higher heat flux as comparedrnwith that predicted by standard DSMC models.