This paper briefly introduces the current development of supercavitating torpedoes in the world,and explains some confusable terms,including cavity,supercavitation,natural supercavitation,air supercavitation and cavity number.

A series of high-speed projectile experiments were conducted to investigate the characteristics of natural supercavitation.

To study the shape stabilities of natural supercavitation,a numerical method was brought forward to calculate the shape of unsteady natural supercavitation based on the principle of Logvinovich of the cavity sections expansion.

In order to obtain the characteristics of natural supercavity form with perfect reducible drag,and based on homogeneous flow hypothesis,a multi-phase model of natural supercavity flow for underwater projectiles is built using commercial CFD software Fluent 6.

In this paper, the three- dimensional numerical simulations are carried out to hydrodynamic of the natural supercavitating projectile by mainly commercial software Fluent.

Secondly, the unsteady process of the evolution and interaction between natural cavity and exhausted gas of the underwater vehicle is simulated using the boundary conditions defined by UDF, based on the 2D mathematical model of high speed underwater vehicle.

This dissertation is aimed at exploring more sound cavitation models, developing efficient and accurate numerical methods, and creating computer software with independent intellectual property rights, for the simulation of three-dimensional multi-phase unsteady natural cavitating flows, and utilizing them to analyze actual engineering cavitation problems.

Edge location and detection in supercavitation s digital imagery;

Research progress of supercavitation hydrodynamics;