On the probabilistic particle simulation of an arcjet flow expansion

We apply a particle code (Direct Simulation Monte Carlo, DSMC) to a nozzle flow expansion set-up which is typical for thermal plasma spray systems. Although those systems tend to have a pressure level which is too high to be treated with DSMC we obtain good results with respect to Pitot pressure measurement based Mach number estimations at different axial distances from the nozzle exit plane. Precisely, we compare the Mach numbers at 0, 30, 60, and 90 mm distance from the nozzle exit plane which was chosen as inflow boundary. The relative deviation of the simulated Mach numbers (Ma) from the measured is mostly about 10%. An influence of the flow field upstream due to a static boundary condition downstream is also observed. The vital code extensions which allowed this simulation with DSMC are briefly discussed. Further code extensions for future research activities are outlined.