细长体射弹高速水平入水研究

为研究射弹在水中航行的弹道特性,对细长体射弹高速水平入水进行了实验,并利用高速摄像机进行了自动同步拍摄,研究了超空泡的形成和发展过程,以及水箱底部2处位置在水下压力波影响下的压力变化趋势; 基于动网格技术模拟了射弹在水中的航行过程,获得了射弹质心的位移、速度、加速度、射弹的偏转角度等物理量的变化规律,通过对航行过程中空化现象的详细分析得到了射弹空化发生的部位。结果表明:由于受水压力波影响,射弹周围水域压力会出现突跃; 射弹航行过程中先在弹肩部位发生空化; 射弹航行过程中尾部在空泡内发生偏移以保证航行的稳定性。

Study on Horizontal Water-entry of Slender Projectile With High-speed

To study the ballistic characteristics of the projectile in the water,the high-speed horizontal water-entry of slender projectile was experimented,which was automatically shot by using high-speed camera.The formation and development of the supercavitation were studied.The pressure variations of two points on the bottom of water tank were showed by pressure sensor.Based on the dynamic mesh method,the sailing process of the projectile was simulated,and the changes of the displacement,velocity,acceleration and the deflection angle of mass centre were obtained.The location of cavitation were obtained by analyzing the cavitation phenomenon.The results show that the water pressure around projectile sharply changes due to the effect of pressure wave.During the sailing process,the cavitation occurs at the shoulder of the projectile,and the tail of the projectile is displaced to ensure sailing stability in the cavity.