中文摘要：

介绍了几种不同工况下高速细长体入水过程的实验研究工作.用高速摄影仪实时记录了细长体高速入水时与自由液面之间的瞬态相互冲击作用,清晰地观察了细长体高速入水后诱导生成的水中空泡流的形态及其演化过程.具体分析了几种工况下高速细长体入水瞬间自由面的波动特性和细长体入水后运动的不稳定性.从实时记录的照片中,测量出相邻2帧图片之间的细长体的位移差之后,计算出细长体在入水过程中以及在水中的瞬时速度.通过分析物体速度的变化趋势,了解了超空泡流动的复杂过程.

英文摘要：

This paper presents an experimental study on the fluid dynamic processes of water entry of a slender body in some different cases.The impact effect between slender body and water surface after water entry of a slender body are recorded at real time by a high-speed camera.The development process of supercavitation which is induced by high-speed slender body is visualized clearly.The oscillation of water surface after water entry of a slender body and the instability of the motion of slender body in some different cases are analyzed in detail.The velocities of slender body after entry water are calculated from experiment data.According to our analysis to the variation tendency of the slender body＇s velocity,the effect of supercavitation on drag reduction is validated.