质心位置对超空泡射弹尾拍运动影响分析

基于均质平衡流理论,通过求解混合介质的RANS(Reynolds-Averaged Navier-Stokes equations)方程、SST(Shear Stress Transport)湍流方程和不同介质之间的质量输运方程,结合刚体运动方程和网格变形方法,研究了不同质心位置的超空泡射弹尾拍运动特性以及尾拍运动下超空泡形态特性,对比分析了不同质心位置的超空泡射弹尾拍运动的刚体运动和尾拍力的变化特征.结果表明,射弹尾拍运动对空泡形态的对称性有较大影响,发生碰撞处的空泡壁面朝着弹体转动的方向发展;射弹尾拍运动的转动角度、角速度、角加速度以及尾拍阻力和尾拍升力等都表现出周期性变化规律,且随着质心与射弹头部距离的增加,转动惯量增大,变化周期也增大.

Analysis of the effect of mass center position on tailslap of supercavitating projectile

The numerical simulation of the cavity morphology in supercavitating projectile tailslap was studied and the rigid body motion parameters and tail-slapping forces variations were comparatively analyzed under different mass centre positions of the supercavitating projectile, based on the theory of homogeneous equilibrium flows, by solving the Reynolds-averaged Navier-Stokes equations (RANS) of mixture fluid, shear stress transport (SST) turbulence transport equations and the mass transport equations between each phase, combined with rigid body motion equations and mesh deformation method. The result shows that the tail-slapping of the supercavitating projectile destroys the symmetry of cavity morphology, the cavity wall of the impact position develops along the direction of the projectile motion; the rotation angle, angular velocity, angular acceleration and tailslap force change periodically, and with the centroid position away from the head of the projectile, the larger the moment of inertia, the greater the period.