为了获得弹体入水后的运动规律、液体压缩状况、空泡发展演化规律，建立包含空气、弹体和水的三维流-固耦合数值计算模型。在弹体初始速度分别为500 m/s、750 m/s、1000 m/s、1250 m/s、1500 m/s的情况下，开展数值仿真计算，获得高速入水过程中弹体的速度、加速度、表面压力以及弹体周围薄层内流体密度的变化规律。计算分析结果表明，弹体的加速度、弹体周围薄层内流体的压强峰值随着弹体初始速度的增加而增加，而弹体的速度在入水过程中反而快速下降；弹体高速入水时，表面液体压力急剧增加，弹体周围薄层内的流体密度随之增大，弹体表面的空泡不易闭合。
In order to obtain the motion law, liquid compression state and development & evolution law of cavitation after the water-entry of projectile，a 3-D fluid-solid coupling (FSI) numerical model involving air, projectile and water is established. In the condition of the initial velocity of the projectile is 500 m/s, 750 m/s, 1000 m/s, 1250 m/s and 1500 m/s respectively, the numerical simulation is carried out, and then the change law of velocity, acceleration, surface pressure and fluid density in the thin layer around the projectile during high-speed projectile water entry were obtained. The results show that the acceleration of the projectile and the peak pressure of the fluid in the thin layer around the projectile increased with the increase of the initial velocity of the projectile, but the velocity of the projectile decreased rapidly during the process of water-entry. When the projectile entered water at high speed, the pressure of surface liquid increased sharply and the fluid density in the thin layer around the projectile increased accordingly, the surface cavitation of the projectile is not easy to get closed.
2024,46(24): 40-45 收稿日期：2023-12-17
DOI：10.3404/j.issn.1672-7649.2024.24.007
分类号：U661.1；O359
基金项目：国家自然科学基金资助项目（51969017）
作者简介：费根胜(1979-),男,硕士,高级工程师,研究方向为流固数值仿真模拟
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