微下击暴流风场模型在弹道仿真中的应用

Application of Micro-downburst Wind Field Model in Ballistic Simulation

为了研究微下击暴流风切变模型在外弹道仿真中的应用,基于流体力学基本原理,采用涡环法建立了微下击暴流风场模型,通过引入涡环倾斜变化矩阵来描述微下击暴流风场非对称特性,采用多涡环叠加的方法来模拟实际情况下的复杂风速分布。将六自由度刚体弹道模型与风场模型相结合,以某122 mm尾翼火箭弹为例进行弹道仿真。结果表明,所建立的微下击暴流风场模型具有良好的三维特性,能够合理描述实际微下击暴流风场分布;受微下击暴流影响,火箭弹的飞行时间、射程、侧偏、末速度以及角运动等弹道特性均发生较大变化。

To study the application of micro-downburst model to ballistic simulation,a vortex ring model based on principles of fluid mechanics was established,the asymmetric characteristics were described by using tilt matrix.The real wind field distribution was simulated by using multi-vortex method.The micro-downburst model was combined with 6DOF ballistic model,and a 122 mm fins rocket was taken as an example of simulation.The results show that the multi-vortex model has good three-dimension characteristics to describe the real micro-downburst wind field.Under the influence of micro-downburst,the ballistic parameters such as flight time,range,side deviation,falling velocity and angular motion change a lot.