重叠网格方法研究多子弹抛撒气动问题

子母弹抛撒气动问题是一类典型的有相对运动的多体气动问题,也是重叠网格方法最有价值的应用领域之一。采用MI-Grid重叠网格软件系统,耦合流动力学方程和动力学/运动学方程,研究子弹分离过程的气动性能和运动轨迹,并结合正交试验设计,讨论和评估了出舱条件及气动干扰对子弹分离运动的影响,指出子弹在抛撒流场中受激波干扰对姿态运动影响很大,单子弹抛撒时母弹激波扫射使子弹俯仰特性剧烈波动,多子弹抛撒时弹舱流动受子弹挤压反射激波使子弹姿态抬头。

Investigation of Cluster Bomb Projection Problem Using Overset Grid Method

Cluster bomb projection is a typical multi-body aerodynamic problem with relative motions, and is also a valuable application area for the overset grid method. In this paper, we employ the MI-GRID overset software to investigate the aerodynamic and movement characteristics coupling the fluid dynamic governing equation and the rigid body movement equations. The orthogonal experimental design is also employed to discuss the effect of the initial and the aerodynamic interference on the movement of the bomb. The results indicate that the bomb is greatly affected by the shock interference. When a singular bomb is projected, the shock of the missile makes the pitching movement of the bomb vary abruptly, while the multiple bombs projection makes the bomb rise due to the reflection shocks of the bomb bay.