A STUDY OF SOLUTION TO REDUCE DRAG FORCE OF A HIGH-SPEED TORPEDO BY A CONVEX CAVITATOR

Abstract

Torpedo is a projectile that moves underwater, so the drag force has big effects on using the efficiency and navigation of this device. One of the advantages of cavitation is reducing the drag force when super_cavitation has appeared on the body of torpedo. From the conclusion of the paper [5] that our team did, the convex cavitation makes a smaller drag force than basic triangular cavitation. This research focuses on studying the effect of convex cavitation attached on the nose of torpedo Set53M helps to make bubble cavitation and cover the whole body when torpedo moves at the high speeds. Therefore, the drag force is reduced significantly. The Singhal cavitation model and Rayleigh Plesset cavitation equations are used in simulating cavitating flow over 3D basic torpedo and an optimizing torpedo with convex cavitation when cavitation number     s changes.