Numberical Research On Verticalwater Entry Of The Rotational Small Solid Of Revolution

Air-injected torpedoes,super-cavitating missiles,etc.,usually have a certain angular velocity of rotation before they are launched from the air into the water.In this paper,the numerical simulation method is used to study the hydrodynamic characteristics of the vertical rotation of the small rotary body into the water process.The effects of parameters such as rotational angular velocity,surface roughness and head shape on the hydrodynamic characteristics of the incoming water are analyzed.The main research contents and results are as follows:Based on the RANS equation solving method,the VOF multiphase flow model and the k-? SST turbulence model are introduced,and the self-defined function is embedded in the spring approximate smooth model method to simulate the rotary motion,and the numerical simulation of the vertical rotation into the water process of the small rotary body is developed.The method is compared with the experimental data in the literature to verify the validity of the numerical calculation method.The numerical simulation of the influence of the hydrodynamic characteristics of the rotating water of the ball-end revolving body is carried out.The effects of the angular velocity and surface roughness on the hydrodynamic characteristics of the rotating water are analyzed.The rotational angular velocity and surface roughness are shown.The influence of angular velocity,cavitation shape and surface velocity.The numerical simulation study on the influence of the hydrodynamic characteristics of the rotating water of different head-type rotary bodies was carried out.The evolution process of the hollow bubbles in the rotation process of different head-type rotary bodies and the resistance coefficient,velocity,angular velocity,cavitation shape and surface of the head-type water inflow were analyzed.The law of the influence of speed.