Research on the equivalent relationship of torpedo penetrated by underwater supercavitation projectile based on energy consumption model

Supercavitation projectile is one of the research hotspots of underwater defence technology. The cost of underwater damage test is so high that equivalent test on land is considered as a possible alternative. Therefore, it is necessary to obtain the equivalent relationship between the target and related materials under the condition of supercavitating projectile underwater penetration. Taking MK48-5 torpedo as the object, a typical torpedo structure model composed of shell and 14 key components is constructed. Considering the influence of aqueous medium on penetration, the process of underwater supercavitating projectile penetrated torpedo could be divided into two stages: (1) the projectile penetrated the aqueous medium and the torpedo shell, (2) the projectile penetrated key parts of the torpedo. The energy consumption model of aqueous medium and target plate are established. According to the principle of limit penetration velocity equivalence and energy equivalence, the relationship between target and equivalent target in two stages is obtained respectively. In order to obtain the damage effect of projectiles hitting torpedoes vertically in different directions and under different working conditions, it is necessary to study the four typical sections of torpedoe: warhead, control section, fuel tank and torpedo afterbody. Therefore, the multi-layer equivalent target models of underwater penetration and torpedo penetration under different conditions are established.