Unsteady Dynamics of Particles Accelerated by a Shock Wave
The dynamics of shock-accelerated nylon microparticles (dp = 4 um) are studied in the post-shock relaxation zone for incident Mach numbers, Ms = 1.2, 1.3, 1.4, and 1.5. Particle motion is imaged using a multi-pulse laser and a high-speed camera system. The velocity, acceleration, and the coefficient of drag for an individual particle are estimated based on its recorded trajectory. The absolute shock location is obtained using a shadowgraph system. Results show significant difference from earlier empirical relationships in the variation of CD with respect to particle Reynolds number (Rep).