水下炮弹水弹道特性仿真研究

Simulation Research on Ballistic Characteristics of Underwater Projectile

应用了超空泡技术的水下炮弹在水下航行过程实现极大减阻,水下航程大幅提升,应用前景更为明朗。基于弹箭外弹道学及流体仿真软件对水下炮弹开展研究,建立了水下刚体弹道方程组,数值求解了水动力系数,仿真解算了相关弹道曲线,分析了水弹道稳定的初始攻角阈值。研究结果表明:水下炮弹弹丸发生沾湿的临界攻角为1.5°;900 m/s初速、8000 rad/s转速、1°初始攻角的水下炮弹在水下可稳定航行100 m,存速大于100 m/s,转速大于6300 rad/s;为保证水下炮弹稳定航行,初始攻角应小于1.3°。

With the application of supercavitating technology,the drag of an underwater projectile is greatly reduced,the underwater range is greatly improved,and the application prospect clearer.Based on an exterior ballistics and fluid simulation software program,this paper studies the underwater shell.Underwater rigid body trajectory equations were established,the hydrodynamic coefficient were numerically solved,the relevant trajectory curve was simulated and solved,and the initial angle of attack threshold when water trajectory stability was achieved was analyzed.The results showed that the critical angle of attack when the projectile was wetted was 1.5°.Under the initial conditions of a muzzle velo-city of 900 m/s,a rotational speed of 8000 rad/s and an angle of attack of 1°,the underwater projectile can sail 100 m stably with an residual velocity of more than 100 m/s and a rotational speed of more than 6300 rad/s.The initial angle of attack should be less than 1.3°to ensure the stable navigation of underwater shells.