Study On Load Reduction Of Revolved Body Entering Water At High Speed

The high-speed water entry of revolved body is a very complicated problem,involving the coupling of gas,liquid and solid.When it hits the water surface at high speed,the revolved body needs to withstand a large overload,which causes the structure of the rotating body to be damaged and the internal components to fail.Therefore,it is of great guiding significance for the development of maritime weapons to the research on buffer and load reduction of highspeed water entry of revolved body.In this paper,a numerical simulation method is used to research the buffer and load reduction of high-speed water entry of the revolved body with a cylinder.The main study contents are as follows:A numerical model for the high-speed water entry problem of the revolved body with a cylinder was established and verified based on MSC.DYTRAN.The influence of three constitutive models on the drag of a revolved body with a cylinder entering the water at high speed and the dynamic response characteristics of a cylinder are studied;The buffering process of high-speed water entry of the revolved body with a cylinder was studied by vertical and oblique 45°.The shape of cavitation is discussed.The change of the pressure field and the dynamic characteristics of the rotating body are analyzed when it hit the water surface.And the buffering process is further analyzed.In addition,the stress and strain of the rotating body are also analyzed.The overload and load reduction characteristics of the revolved body with a cylinder are studied from six angles: the pressure in the cylinder,the mass ratio of the cylinder body to the piston,the length-to-diameter ratio of the gas chamber,the incident velocity of the revolved body,the incident angle and the angle of attack.The change law of the overload of the revolved body and the load reduction rate of the cylinder is given.Through the analysis and calculation of buffer and load reduction of the revolved body with a cylinder,the characteristics of the cylinder’s load reduction are obtained,which can provide some reference for the structural buffering load reduction of torpedoes or projectiles.