基于重叠网格技术的超声速子母弹分离研究

Research on separation of supersonic cluster munitions based on overlapping grid technology

超声速下子母弹分离是一种包括多体运动边界与复杂气动流场干扰的多体分离问题。本文中基于重叠网格技术,耦合了流体力学方程和六自由度刚体运动方程组,对子母弹多体分离过程进行了数值模拟,重点分析了子弹穿越母弹头部激波过程中的气动参数变化和流场特性。结果表明:重叠动网格技术可以很好完成对子母弹分离过程中复杂流场的模拟;母弹激波会对子母弹分离过程中的子弹产生较大影响;子母弹的转动使得不同位置子弹的升力出现不同的变化并使得子弹快速分离;速度是影响子母弹分离过程气动参数的一个重要因素。

The separation of cluster munitions at supersonic speeds is a multi-body separation problem which includes the interference of multi-body motion boundaries and complex aerodynamic flow fields.Based on overlapping grid technology,coupled with hydrodynamics equations and six-degree-of-freedom rigid body motion equations,this paper numerically simulates the multi-body separation process of cluster munitions.It also emphatically analyzes the changes of aerodynamic parameters and flow field characteristics of the shock wave generated when the bullet penetrates the master projectile head.The results show that the overlapping dynamic grid technology can well simulate the complex flow field in the process of cluster munition separation.The shock wave of the master projectile will have a great influence on the bullet in the separation process.The rotation of the cluster munitions causes different changes in the lift of the bullet in different positions and makes the bullet separate quickly.Velocity is an important factor affecting the aerodynamic parameters in the separation process of cluster munitions.