Numerical simulation of rarefied nozzle plume impingements

Abstract

This paper describes numerical simulation of rarefied nozzle plume impingements. Two different reservoir pressures 400 kPa are considered. In the case of 400 kPa, the simulation of the nozzle flow was conducted by using the Navier-Stokes equation, and then the analysis of the plume flow was carried out by the DSMC method, employing the nozzle exit conditions obtained by Navier-Stokes equation. On the other hand, for 4 kPa, both the nozzle flow and the plume impingement have been calculated using the DSMC method. Concerning the angle between the nozzle axis and the flat plate, three kinds of angle are selected, that is, 90°, 45° and 0°. In addition, we considered the case where there exists a flat plate behind the nozzle. Simulated results have been compared with the existing experiments for the pressure and shear stress distributions on the flat plate. A good agreement between the DSMC results and the experiments are shown. In the case of the oblique and parallel impingements, the location of the impingement pressure peak and the stagnation point shifted upstream with increasing rarefaction.This paper describes numerical simulation of rarefied nozzle plume impingements. Two different reservoir pressures 400 kPa are considered. In the case of 400 kPa, the simulation of the nozzle flow was conducted by using the Navier-Stokes equation, and then the analysis of the plume flow was carried out by the DSMC method, employing the nozzle exit conditions obtained by Navier-Stokes equation. On the other hand, for 4 kPa, both the nozzle flow and the plume impingement have been calculated using the DSMC method. Concerning the angle between the nozzle axis and the flat plate, three kinds of angle are selected, that is, 90°, 45° and 0°. In addition, we considered the case where there exists a flat plate behind the nozzle. Simulated results have been compared with the existing experiments for the pressure and shear stress distributions on the flat plate. A good agreement between the DSMC results and the experiments are shown. In the case of the oblique and parallel impingements, the location of the impingem...