抄録
Stability of cylindrical imploding shocks is numerically studied. It is particularly investigated how disturbed imploding waves change the shape of the front as they propagate. Analyses were performed by the ray-shock theory. The finite difference calculation of conservation equations was also made. It is shown that even small disturbances which are generated at the initiation affect the symmetry of the wave to a large extent. The propagation speed of disturbances relative to the imploding speed, that is the propagation speed along the periphery, also affects the change of shape of the imploding wave front. When the shock wave is locally deformed, the propagation direction of the deformed wave also affects the shock stability. The shock fronts disturbed artificially were visualized by shadow photography and compared with numerical results. Both results showed qualitative agreement.
