基于动网格技术的飞机舱弹分离过程 CFD/ RBD耦合数值仿真

飞机舱弹分离瞬间特性严重影响导弹/炸弹的打击精度。采用计算流体动力学(CFD)和刚体动力学(RBD)模型耦合求解的数值仿真方法,应用网格弹性光顺和局部重构相结合的动网格技术,有效地避免了刚体运动而引起的网格畸变,仿真计算了炸弹舱弹分离后俯仰角度变化过程 .仿真结果表明,舱弹分离时向炸弹施加 1个合适的抛 射力矩,有助于炸弹在下降过程中快速地调整其打击姿态。

CFD/RBD Coupling Numerical Simulation of Aircraft Cabin Bomb Separation Process Based on Dynamic Grid Technology

The instantaneous characteristics of aircraft cabin bomb separation seriously affect the strike accuracy of missiles/bombs.The numerical simulation method of coupling solution of computational fluid dynamics (CFD) and rigid body dynam.ics (RBD) model is adopted, and the dynamic grid technology combining grid elastic smoothing and local reconstruction isapplied to effectively avoid the grid distortion caused by rigid body motion. The pitch angle change process after cabin bombseparation is simulated and calculated. The simulation results show that an appropriate ejection torque is applied to thebomb when the cabin bomb is separated, which helps the bomb to quickly adjust its attack attitude in the process of descent.