Numerical Simulation And Experimental Of Supercavity Of Mall Scale Projectile

Supercavitation is a new type of technology; supercavitation can make navigation torealize high speed. Supercavitation can reduce more than90%of the underwater vehicle ofresistance; it can realize the high-speed navigation of the underwater vehicle. Supercavitationis a revolutionary breakthrough of the drag reduction technology. The flow field around thenatural supercavitation projectile has a strong impact on supercavity pattern. Supercavitationflow is one of the most complicated flows, that involves unsteady flow, phase transformation,turbulence and compressibility phenomena.In this paper, fluent software is used for the numerical simulation of cavitationcharacteristics and drag reduction characteristics of natural supercavitating projectiles. A setof underwater high-speed projectiles is designed, and tests of the underwater high-speedprojectile bodies done. The cavitation form and fluid dynamics problems of high-speedprojectiles through a combination of methods of numerical simulation and test of projectilesare studied. The specific contents are as follows:Part I: Understanding of the situation at home and abroad in the supercavity numericalsimulation of the underwater high-speed projectiles. Summarize the numerical simulation ofturbulence model and the method of control equations which are widely used of theunderwater projectile. The wall function of the turbulence model is illustrated. The numericalsimulation method and the boundary conditions used in this paper are explained. Supercavitycontrol equations are elaborated. Characteristics and scope of application of differentturbulence models are compared. Simulation that is widely used to several typical is analyzed,advantages and disadvantages are compared, And numerical simulation of the several typicalturbulence model are used in this experiment. Comparative simulation results obtained underthe same experimental model and the same cavitation number, select the most suitable for thenumerical simulation method.Part II: Multiphase flow force characteristics of the natural vacuoles underwaterhigh-speed projectiles are studied using the methods of numerical simulation. The naturalsupercavitation and the Resistance characteristics of the underwater high-speed projectiles arestudied. The simulation results of the vacuolar morphology characteristics and the drag reduction characteristics under different diameter cavitator different Reynolds numbers areanalyzed. The law of the Projectiles vacuolar morphology affected by the diameter ofcavitation and the cavitation number is got by comparing with known empirical formula andprojectiles test data. It provides theoretical basis and technical support for underwaterhigh-speed projectiles natural supercavity.Part III: A small proportion of the projectile model is established based on a foreignsupercavitay torpedoes. Numerical simulation and underwater projectile test are done for thismodel. The simulation results of the vacuolar morphology characteristics and the dragreduction characteristics under different diameter cavitator different Reynolds number areanalyzed. The law of the projectiles vacuolar morphology affected by the diameter ofcavitation and the cavitation number is got by comparing with known empirical formula andthe result of the Numerical simulation.