Abstract
The flow field induced by two vortex rings approaching each other at a high speed has been experimentally and numerically studied. The two vortex rings have been generated after shock waves are emitted into the atmosphere at the same time from two nozzles connected to a shock tube, after which they follow a jet flow. The flow field, where the vortex rings come close to each other, has been clarified from optical shadowgraph and numerical results. As the vortex rings approach each other, a supersonic region grows upstream of the rings and a high-pressure region occurs downstream of the rings. As these approach more closely, an inward-facing shock is generated in the narrow region between the two vortex rings. It has been shown that the formation of the shock is due to the same mechanism as that in the convergent-divergent nozzle flow.
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