수제 기폭장치를 이용한 캐비테이션 버블거동의 실험적 연구

Abstract

A small amount of gunpowder is used as an explosive method to create cavitation bubbles under water to investigate very short total life from generation to disappearance, and the experiments are conducted under four boundary conditions: near bottom solid wall; near bottom wall and side wall; near free water surface; near free water surface and side wall surface to study how the shape of bubble changes. A high-speed camera was used to observe and record the production, expansion, contraction, and collapse processes of cavitation bubbles under four different boundary conditions. And with the PRESCALE method, the size of the impact area when the jet generated when the cavitation bubble bursts hits the wall surface is obtained. PVDF (Polyvinylidene fluoride) sensor is tested to record the impact pressure when it hits the bottom wall surface.