Supercavitation has been recently presented as an effective method for the drag reduction of underwater vehicles. However, maintaining the supercavitating state requires a lot of energy, making vehicles difficult to control. Therefore, it is necessary to design an underwater vehicle with low drag in the fully wetted state while being able to move at ultra-high speed in the supercavitating state. In this study, a detachable fairing design for underwater vehicles is proposed, which has the advantage of increasing the total voyage and avoiding the problem of difficult steering in the supercavitating state. On the other hand, the study of non-body-of-revolution (non-BOR) has become a prevalent area of interest in the shape design of underwater vehicles. The cavity generated by an elliptical disk-shaped cavitator is studied numerically. It is found that the cavity profile on the cross-section near the cavitator is approximately elliptical. The cavity length of an elliptical disk-shaped cavitator is almost the same as that of a disk-shaped cavitator when they have the same inflow area. Based on these two characteristics, the parameters of the internal elliptical disk-shaped cavitator are optimized, which provides a promising strategy for the issue of cavitators increasing drag in a fully wetted state.

最近提出超空泡作为水下航行器减阻的有效方法。然而，维持超空泡状态需要大量能量，使车辆难以控制。因此，需要设计一种在全湿润状态下阻力小，同时又能在超空泡状态下超高速运动的水下航行器。本研究提出了一种可拆卸的水下航行器整流罩设计，其优点是增加了总航程，避免了超空泡状态下转向困难的问题。另一方面，非旋转体（non-BOR）的研究已成为水下航行器外形设计中的一个普遍关注领域。对椭圆盘形空化器产生的空腔进行了数值研究。发现靠近空化器的横截面上的腔体轮廓近似为椭圆形。在入流面积相同的情况下，椭圆盘形空化器的腔长与圆盘形空化器的腔长几乎相同。基于这两个特性，优化了内部椭圆盘形空化器的参数，为解决空化器在完全润湿状态下增加阻力的问题提供了一种有前途的策略。