跨介质弹体出水稳定性

研究弹头构型、发射角及弹射速度对弹体跨介质稳定性的影响机制，为多样化弹道跨介质兵器/飞行器的设计提供试验及理论支持.开展弹体跨介质出水试验及数值仿真，经瞬时图像集解析获取弹体跨介质偏转角变化量及运动轨迹，构建高精度气/水跨介质数值模型，揭示弹体穿越气/水界面过程中弹头构型、发射速度、发射角对弹体承载分布及跨介质稳定性的作用机制.研究结果表明，弹体气/水跨介质数值模型计算误差<5%；同一弹体跨介质出水稳定性随发射速度、发射角增大而提高；相同发射工况时，各弹头构型跨介质出水稳定性：圆弹头>90°锥形头>120°锥形头>平弹头；跨介质弹体表面液膜形态对称性越好、液膜面积变化量越小则有利于减少弹体跨介质径向载荷振幅，提升跨介质稳定性.

Water-to-Air Stability of Trans-Phase Missile

The influence mechanism of the missile-head shape, launch angle and ejection velocity on the missile trans-phase stability was studied to provide the experimental and theoretical support for the design of diversified ballistic trans-phase weapon/aircraft. Carried out the missile water-to-air trans-phase experiments and numerical simulations, obtained the missile trans-phase deflection angle variation and trajectory through processing the transient images, established the high-precision air/water trans-phase numerical model, and the function mechanism of the missile head, launch velocity, launch angle on the load-sustaining distributions on the missile surface and the trans-phase stability as passing through the air/water interface was revealed. The research results indicated that the calculation error of the missile air/water trans-phase numerical model is < 5%; for the same missile model, the water-to-air trans-phase stability increases as the launch velocity, angle increase; under the same launch conditions, the water-to-air trans-phase stability of different missile-head shapes: round head > 90° conical head > 120° conical head > flat head; the better symmetric water film shape on the missile surface and the smaller water film area variation amid trans-phase process will reduce the missile trans-phase radial load amplitude, which improves the trans-phase stability.