水中衝撃波のフォーカッシング現象と高圧発生のメカニズム

概要

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Underwater spherical shock focusing can be obtained in a closed ellipsoidal-shaped cavity by the explosion of a small silver azide pellet. The present paper reports on an experimental and numerical study of the generation of high pressure and its mechanism. The shock focusing pressure was measured in a 500mmx700mm ellipsoidal cavity with a PVDF pressure transducer which has a wide frequency response. A high pressure of 3000bar was obtained for a 100mg silver azide pellet. The process of shock focusing was also studied numerically by the TVD finite difference scheme. A quantitative agreement was obtained between the experiment and the simulation. It was demonstrated that the underwater shock focusing is one of the most efficient methods to obtain a controlled high pressure in a small region.
1990-06-25