Numerical Simulation Of Hydrodynamic Characteristics Of Under-water Supercavitation Vehicle With Fins

The technology of super-cavitation could greatly reduce the drag of theunder-water vehicle, so that the velocity of the vehicle could be greatly promoted..nowadays, many countries in the world has began the research of super-cavitation.The supercavitation torpedo has high sailing speed, The poor flexibility is oneof its weakness. General speaking, the cavitator and the fins(some vehicles have nofins),which contact with the water directly, could provide considerable control tothe vehicle. In the control of the vehicle, Fin plays an important role.In this paper, the fluid dynamic characteristics of supercavitation vehicle withfins are simulated:Creat the calculation model according to the research contents, analyze theinfluences of different parameters to the calculation results. The simulations showthat the multiphase flow model has great influence to the results, the turbulencemodel has some influence to the results, and step time has little influence to the totalcavitations, but small time step could catch the subtle changes in the cavitationshape and hydrodynamic characteristics.Analyze the influences of vehicles with or without fins, different ventilations,velocities,attack angles and sweep angle to the cavitation shape and hydrodynamiccharacteristics.Research the fin’s active and passive control to the vehicle’s attitudes. Thesimulations show that the submerged depth of the fins has great effect to the vehiclecontrol. The gravity and angle of attack will effect submerged depth of the fins andthen effect the fins’ control. in the oscillating process of the vehicle after beingsubjected to a disturbance, the fins can reduce the swing period and amplitude, andthen improve the navigation stability.