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Dalian, China

Jin H.,91439 PLA Troops | Zhou H.,91439 PLA Troops | Shen X.-L.,91439 PLA Troops | Guo K.,Harbin Engineering University
Binggong Xuebao/Acta Armamentarii | Year: 2013

The process of bubble pulsation is observed by using high-speed camera and free field pressure sensor, and the dynamic characteristics of underwater explosion bubbles are analyzed. Based on the potential flow theory, the fluid around an underwater explosion bubble is assumed to be incompressible, inviscid and irrotational. The dynamic characteristics of underwater explosion bubble are simulated using a boundary integral method. The results show that the bubble pulsation law is consistent with the classical underwater explosion theory when explosive explodes in free field; when it explodes near the water bottom, the bubbles are absorbed by the water bottom, the pressure of secondary pulsation is smaller and the bubble pulsation period is longer than that in free field.; when the explosion bubble is near the boundary, its lower surface is flat at expansion stage, the jet pointing to the water bottom forms earlier at the collapse stage, and the bubble forms a reverse jet departing from the water bottom at rebound stage. The experimental results agree with simulation results. Source

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