Interaction of a shock wave with a vortex ring is investigated experimentally and computationally. The experimental observation is made by the shadowgraph method, using a spark light of very short duration of about 20 ns. The shadowgraphs are transformed into digital images by an image processor, and the intensity distributions are processed digitally. Compressive (longitudinal) waves generated (scattered) by the shock-vortex interaction are observed experimentally and compared with a computer simulation. The speeds of the shock wave, vortex and scattered wave obtained from the digitized images are compared with the simulation, and agreement is obtained between them. It is found that the scattered wave is regarded as an acoustic wave whose source is identified at the position and instant of the crossing of the shock wave over the core of the vortex ring.

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