人员离机轨迹数值模拟及快速预测研究

Numerical Simulation and Quick Prediction of Men's Separation Trajectory

离机轨迹研究在分析外挂物分离、导弹投放以及人员空中脱离过程等方面有着重要的参考意义。运用动态嵌套网格技术,通过CFD方法来模拟人员空中离机后的运动轨迹。提出一套基于本征正交分解(POD)方法的人员离机轨迹快速预测算法。将CFD数值模拟得出的离机轨迹作为样本,以飞行马赫数和攻角双参数变化为例,详细介绍POD方法预测离机轨迹的实现步骤。结果表明:POD方法相对于CFD方法可以大大减少计算时间,并且POD预测结果与CFD方法得到的结果吻合较好,为离机轨迹预测在工程应用上提供了一种快速简便的方法。

Separation trajectory research has an important reference value to analyse the process of store separa tion, missile launch and people separate from the aircraft. Using the dynamic nested grid and the CFD method, the separation trajectory is simulated. To predict the trajectory of the object from the airplane, a numerical sim- ulation program based on the proper orthogonal decomposition（POD） method is established. Using the CFD simulation trajectory as samples, changing the flight Maeh number and the angle of attaek as an example, the implementation steps of the POD method are introduced to predict the trajectory from the airplane. Results show that based on the existing sample data, the POD method relative to the CFD method can greatly reduce the computation time, and the results obtained by the POD are well agree with the results from CFD method. POD method provides a quick easy prediction for the separation trajectory in engineering applications.