水下并联超空泡射弹外弹道数值分析

为获取水下并联发射超空泡射弹的弹道特性,基于重叠网格技术、RANS方程、Schnerr-Sauer空化模型和k-ε湍流模型,对超空泡射弹的水下同步发射与异步发射工况进行了多工况数值模拟研究。通过设置不同的弹丸间距与发射时间间隔,对比分析了并联超空泡射弹水下运动的流场特性与弹道特性。研究结果表明:对于水下同步发射,弹丸内侧空泡发展受到抑制,弹丸在不对称的水动力作用下向外侧偏转,当弹丸间距增加至4D以上时,两弹丸之间几乎无干扰; 对于异步发射的先发弹丸,随着发射时间间隔的增加,其弹道偏移量先增大后减小; 对于异步发射的后发弹丸,随着发射时间间隔的增加,侧空泡扩张的抑制作用逐渐解除,并有过度膨胀的趋势,时间间隔越大,速度衰减越慢。

Numerical Analysis of External Trajectory of Underwater Parallel Supercavitation Projectiles

To obtain the ballistic characteristics of supercavitation projectiles during underwater parallel launching,the underwater processes of synchronous and asynchronous parallel projectiles were simulated based on overset mesh,RANS equation,k-ε turbulence model and Schnerr-Sauer cavitation model. By setting different projectile spacing and launching time interval,the flow field characteristics and ballistic characteristics of underwater parallel supercavitation projectiles were compared and analyzed. The result shows that for underwater synchronous launching,the development of cavitation inside the projectile is inhibited,and the projectile deflects outwards under asymmetric hydrodynamic action. When the projectile spacing increases to be greater than 4D,there is almost no interference between the two projectiles. For asynchronous launch projectile,the offset of projectile increases first and then decreases with the increase of launch time interval. For the projectile launched after asynchronous launching,with the increase of launch time interval,the inhibitory effect of lateral cavitation expansion is gradually relieved,and there is a tendency of excessive expansion. The longer the time interval is,the slower the velocity attenuation is.