Water Entry Cavitation Evolution And Motion Characteristics Of Double Revolving Body In Tandem

The double-revolving body water entry in tandem refers to the process of spatially arranging in the axial direction and entering the water in sequence.It has important military and chemical application backgrounds,such as airborne spreading type lightning protection and segmented navigation body design,surface treatment and heat treatment of multiple objects.In this context,the water entry in tandem study is carried out by combining the experimental and numerical methods.In the test aspect,Established a release system with adjustable water entry speed and controlled enter water timing.Based on this test system,the double-rotating body in tandem water entry test under fixed height is carried out.By comparing the motion processes under different water entry sequences,four motion modes are divided,and obtaines the bubble evolution characteristics and motion laws of the four modes.The water entry test of the rotating body with different structural parameters was carried out,and studies the influence of the slenderness ratio and the taper angle on the water movement of the rotating body in tandem.The water entry test of the rotating body under different water entry speeds was carried out,and studies the experimental images.The characteristics of typical cavitation evolution under water entry velocity are analyzed.The distribution characteristics of collision time and critical collision time under different Fr are analyzed,and compares the attitude distribution characteristics of two moving bodies in the same time.In the numerical simulation,a six-degree-of-Freedom movement simulation model of water entry in tandem is established,which results is in good agreement with the experimental.Based on the simulation model,the simulations of different water inflow sequences were carried out,and the multi-phase flow field and hydrodynamic characteristics under different water inflow sequences were analyzed.Then the hydrodynamic characteristics under closed cavity disturbance were studied,and the closed cavity was analyzed by combining the pressure characteristics.The effect of the independent tail bubble on the first movement.