平飞时内埋导弹弹射分离仿真与研究

利用应用计算流体动力学软件FLUENT的二次开发功能和RNGk-ε湍流模型建立了载机投弹流场数值模拟和弹道仿真相结合的仿真模型.运用动网格技术更新导弹与载机发生相对运动而导致的计算域变化.将整个流场的解与六自由度运动方程的解进行耦合,模拟计算了超音速条件下内埋导弹与载机分离的过程.结果表明,气动干扰对弹的纵向运动影响非常大,随着马赫数的增加,仿真结束时导弹下落距离减小,俯仰角曲线波动幅值增加.

Simulation of Missile Separation from Internal Weapon Bay

The model combining numerical simulation with trajectory simulation was established for the process of store separated from the plane by the second explore technologies of the CFD software(FLUENT)and the RNG k-ε turbulence model.The changed flow field caused by the relative motion between the store and the plane was renewed by the method of dynamic mesh.The process of a missile separated from aircraft was simulated under supersonic condition coupling the solution of whole field with the solution of 6-DOF equations.The result showed that:1) The aerodynamic interference has great effect on the store's longitudinal motion;and 2) As Mach number increases the displacement of dropping decreases and the amplitude of angle of pitching increases.