不同头型射弹低速倾斜入水空泡及弹道特性试验研究

为研究射弹头型对低速倾斜入水空泡及弹道特性的影响，基于高速摄像方法，开展不同头型射弹低速倾斜入水对比试验，得到了射弹头型对入水空泡、运动速度、俯仰角和阻力系数的影响规律。试验结果表明：同一入水时刻，空泡直径随着头部锥角增加而增大，半球头型射弹入水空泡直径小于锥角头型射弹；锥角头型射弹速度衰减速率随着锥角增加而增大，半球头型射弹速度衰减率小于锥角头型射弹；入水过程中半球头型射弹俯仰角变化最为剧烈，弹道稳定性也较差；不同头型射弹在入水过程中运动参数呈现出较强的非线性特性。

Experimental Investigation into the Cavity and Ballistic Characteristics of Low-speed Oblique Water Entry of Revolution Body

The oblique water entry of revolution body is experimentally studied. Cavity evolution is discussed. The influences of head form on the water entry cavity, velocity, pitch angle and drag coefficient were experimentally obtained. The experimental results show that the diameter of water-entry cavity increases with the increase in the cone angle of the head, and the cavity formed by revolution body with elliptical head is smaller than that formed by revolution body with cone-shaped head. When the angle of cone-shaped head is larger, the attenuation rate of velocity of revolution body is larger. And the velocity of revolution body with elliptical head is always higher than that of revolution body with cone-shaped head. The pitch angle of elliptical revolution body changes greatly, along with an unstable trajectory. During the water entry of revolution bodies with different head forms, the kinematic parameters change non-linearily.