弹体高速入水弯曲弹道实验研究

通过模型高速入水实验，利用高速摄像机拍摄了弹体入水过程和空泡形态演变过程，得到了4种头部外形模型的弹道曲线，并分析了头型、入水角、入水速度对水下弹道的影响。研究结果表明：椭圆斜截头弹体由于其特殊的头部更容易产生偏向水面的弯曲弹道，而其他3种弹体在一定速度内弹道比较稳定，基本趋于直线，虽然在有些工况下弹道发生了偏转，这是由于弹体加工过程中结构误差等造成的弹道不稳定性；入水角对弹道影响比较显著，小的入水角条件下弹体迅速向水面偏转，而入水角增大到一定程度时弹道向缸体底部偏转。所得结论可为高速入水武器的研究提供参考。

Experimental Research on Curved Trajectory of High-speed Water-entry Missile

The experiment about the four geometries are carried out. A digital high-speed camera is used to record the evolution of the water-entry process and cavity shapes. The flat-trajectory curves of the four different geometries are obtained, and the effects of the head shape, entry angle and velocity on the trajectory are analyzed . The results show that the projectile body with oval-beveled warhead is easier to form the curved trajectory because of its special warhead. The other three kinds of trajectories are more stabilized. When it is at certain speed range, the trajectories verge to be linear; when it is at a higher speed, the trajectory may be curved. The effect of entry angle on the trajectory is obvious. When the entry angle is little, its trajectory deflects to the free surface quickly; when it is larger, the trajectory deflects to the bottom of the cylinder. The conclusions provide reference for the research on the water-entry weapons.