关键词: 变壁厚壳体, 沉底装药, 水下爆炸, 冲击波载荷, 增强效应

Abstract: Bottom-mounted mines are typically deployed on the seabed and are designed to damage surface ships and submarines through underwater explosions. The casing is the key factor influencing the energy output structure of charge underwater explosion(UNDEX). In this paper, based on the theory of UNDEX, the coupled Euler-Lagrange method (CEL) was used to establish a numerical model of the UNDEX of near sea bottom cased charge. The research on UNDEX shock wave load characteristics of cased charge was carried out. The research investigates the characteristics of underwater shock wave loads generated by cased explosives and reveals the effects of various factors, such as charge shape, detonation method, casing configuration, casing thickness ratio, and casing-to-charge mass ratio. Furthermore, a new type of casing with a variable wall thickness suitable for near sea bottom conditions is proposed, which significantly enhances the shock wave load.The results show that: The constraint characteristics of the shell will cause the attenuation and slowing down of the shock wave of the underwater explosion of the submerged charge with distance. The variable wall thickness shell has an enhancing effect on the shock wave load of underwater explosive charges. The peak pressure of the shock wave at 800 mm increases the most with the increase of δ, and the growth rate can reach 9.74%. It can provide reference for the design of underwater weapons.

Key words: cased charge, near sea charge, underwater explosion, shock wave load, enhance effect