Particle-laden high-speed flows over a blunted cone

The ubiquitous particle-laden flows affecting the performances of flight vehicles, such as erosion and cratering on the vehicle surface, have been well-recognized. However, the dynamics of particle-laden high-speed flow have yet to be fully understood. This study examines the particle dynamics in an air over an axisymmetric blunted-cone configuration at Mach numbers 6, 9, and 14 and an altitude of 45km. The direct simulation Monte Carlo (DSMC) method is employed to obtain flow solutions in rarefied flow regimes. A one-way coupled Lagrangian particle methodology with an inelastic rough hard sphere model is developed to examine particle-laden flow dynamics for the particle size range of 0.01 micro meter <= dp <= 2 micro meter. The results showed the bow shocks affect the light particle dynamics, including trajectory deflecting upward, streamwise velocity deceleration, and quick temperature rise. In comparison, the effects on the heavy particles are negligible. A dust-free region is observed along the body of the blunted cone for light particles of dp=0.02micro meter. Heavy particles dp=0.2 micro meter have a broad impact region where the post-collisional particles are presenting.