隐身无人机内埋武器分离安全性数值研究

Numerical Analysis for Internal Weapon Separation Performance of a Stealth UAV

为了验证在结构化动态重叠网格系统上,耦合求解三维非定常NS方程及刚体六自由度方程技术路径的可行性,对跨声速外挂投弹标模和空腔标模进行了计算。结果显示,武器分离轨迹及空腔底部压力系数分布的计算与试验值吻合良好。在此基础上,以某隐身无人机为载机平台,模拟了跨音速下隐身无人机投放制导武器的动态分离过程,并就外流条件对导弹分离轨迹的影响进行了分析。研究结果表明:不同迎角下,导弹出舱后质心的运动轨迹差异较大,尤其在航向,说明外流条件对武器出舱轨迹影响很大,设计武器舱时应充分考虑外流条件的影响。

For validating the method of solving 3-D N-S equations coupled rigid-body 6 DOF movement equations,firstly,the wing-pylon-store and cavity standard model are calculated,the result shows the weapon separation trajectory and pressure distribution on cavity bottom have good agreements between numerical simulation and wind tunnel experiment. Secondly,the dynamic separation between a stealth UAV and air-ground missile is simulated,and the effects of free-stream conditions on separation trajectory of the missile is investigated. The results show separation trajectory at different angles of attack is obviously different,especially at yawing direction,it indicates the effects of free-stream conditions on separation trajectory is very obviously,we should consider the effects of freestream conditions in designing the weapon cavity.