Research To Response Of The Fixed Plate Subjected To Non-contact Underwater Explosions

The status of the study of underwater explosion bubble, the characteristics of bubble campaign, importance of bubble pulse and shock wave and the effect of bubble pulse on the target are introduced in detail in this paper.Some methods ,which describing bubble campaign and the flow field, have been presented in other papers, but these are a little inconvenience to work in the application up. The purpose of this paper is to find a convenient way to the application based on the two assumptions :the first, water is incompressible fluid; the second, unlimited flow of the explosion is spherically symmetric. This paper analyzes bubble movement to and from the barrier by the use of conservation of momentum and gets equations of the motion and some useful conclusions. The energy loss considered by a new form of virtual force in the process of the pulse, a spherical model better meets with the experimental phenomenon; The new equations of pulsating flow field and the law of bubble pulse are obtained with energy loss, and the results by calculation are very accuracy compared with the experimental. Since this method is simple and effective and helpful for engineering applications.In many documents, usually explosive heat is only used to shock wave or bubble pulse. Based on some conclusions, the energy released by explosive is used into three parts: shock wave, bubble pulse and pressure wave and the energy dissipation. Then the expression of peak of shock wave is got and the pressure of shock wave is more reasonable.