Shock-Induced Motion of a Spherical Particle Floating in Air
Shock tube experiments were conducted to investigate the shock-induced motion of spherical solid particles and the flow structure around them. In each shot, a spherical particle initially placed on the shock tube floor was tossed into the air and then collided with a planar shock wave with a Mach number of 1.3 when it reached the top of its trajectory almost at rest. The shock-induced motion of the particle and the flow field around it were visualized by the shadowgraph technique coupled with a high-speed video camera. It was found that (1) the separation points and wakes noticeably fluctuated, (2) the shocked particles moved not only in the horizontal (shock propagating) direction but also in the vertical direction, and (3) the drag coefficients obtained from the present experiments were larger than those from the standard drag curve at the same particle Reynolds numbers.
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