利用轻气炮设备对截卵形弹进行了速度在100～150 m/s的水平入水实验,利用高速相机记录了整个入水过程,获取了截卵形弹体在水中运动的速度衰减规律,并对平头弹、卵形弹及截卵形入水弹道稳定性及速度衰减规律进行了对比,对截卯形弹体入水形成的空泡扩展行为进行了理论研究,建立了关于空泡扩展的理论模型,得到了固定位置和固定时间处空泡扩展半径、速度分别与时间和侵彻距离的关系,实验数据与理论计算吻合很好.%In this paper,the horizontal water-entry experiments of truncated-ogive projectiles at the velocity range of 100～150 m/s were conducted using a light-gas gun and a high-speed camera to record thc whole water-entry process.The characteristics of the velocity attenuation and the drag coefficients of truncated-ogive projectiles were obtained,and the trajectory stability and the characteristics of velocity attenuation for the flat-nosed,the ogive-nosed and the truncated ogive-nosed projectiles were compared and analyzed.The cavity expanding behaviors induced by the truncated ogive-nosed projectile's water entry were studied and a theoretical model of the cavity expansion was established.The relationships between the radial cavity radius,cavity wall velocity and time,penetration distance at fixed locations and fixed times were obtained,and good agreements were found between the experimental observations and the theoretical analysis.
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