Abstract
Optical observation has been performed for interactions between shock waves and vortex rings generated by a shock tube having two branches. A spherical shock wave impinges on a vortex ring which is traveling in the opposite direction. The shock front passing over the vortex ring is diffracted spirally around the vortex core. A part of the diffracted waves intersects the intensified wave front passing through the inside of the ring, and the intersecting points focus. The wave front leaving at the focusing point expands spherically and propagates. The diffracted waves travelling in the opposite direction interact with the other vortex ring and diffract again. The two vortex rings get close to each other, and these forward motions are obstructed. The rings are stretched in the radial direction, and a shocklet is formed between the two ring-shaped vortex cores. Moreover a region of high density is produced behind the both rings. This stimulates propagation of pulse-like waves.
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