水可压缩性对高速航行体入水过程的影响

Influence of water compressibility on the entry process of high-speed projectile

为研究流体的可压缩性对航行体高速入水的影响,对不同入水速度和不同入水角度的航行体入水过程进行了数值仿真。结果表明:在不同入水角度情况下,与不考虑流体可压缩性相比,随着航行体入水速度的增加,空泡尺寸逐渐减小、航行体阻力增大。考虑流体可压缩性引起的空泡尺寸偏差最大超过20%,入水运动轨迹速度方向的偏移程度最大可达1.7倍的差距。对于高速入水航行体,流体可压缩性对于流场参数的影响愈加显著。

In order to study the influence of fluid compressibility on the high-speed water entry projectiles,the numerical simulation of the entry process of projectiles with different entry speeds and different entry angles was carried out.The results show that at different entry angles,compared with the incompressible fluid,with the increase of the water entry speed of the projectile,the cavitation size gradually decreases,and the resistance of the projectiles increases.Considering the compressibility of the fluid,the maximum deviation of the cavitation size exceeds 20%,and the maximum deviation of the velocity direction of the water entry trajectory can reach 1.7 times of the difference.For high-speed water entry projectiles,the influence of fluid compressibility on flow field parameters is more significant.