基于FLUENT的微型修正弹药气动特性仿真

摘要

Research optimizing the structural design of the micro correction projectile aerodynamic shape.The paper proposed a method which meshes a projectile with unstructured grids using CFD software Fluent,uses density based to calculate and simulate the aerodynamic force of a projectile in different attack angle and different Mach meter,and gains the small-caliber guided projectile's movement trend of lift coefficient,drag coefficient and the pitching moment coefficient with variety of flight Mach number and attack angle.We also obtained the distributing trend of pressure and inflow velocity distribution,and analyzed the simulation results.The results indicate that the computational aerodynamic coefficient results conform the exterior ballistics rules of correction projectile,and well simulated projectile flight status on transonic.It can offer some reference for the shape design of projectiles.%研究微型修正弹药的的气动外形结构优化设计问题.由于传统的气动力参数计算方法,计算新型修正弹的气动力参数会造成大的误差,不利于弹道参数计算和飞行稳定性校核.针对上述问题,提出采用计算流体动力学软件Fluent对修正弹进行非结构化网格划分,利用密度基显式求解法,对修正弹在不同攻角、不同飞行马赫数下的气动力进行了仿真计算,得到了修正弹药的升力系数、阻力系数和俯仰力矩系数随飞行马赫数和攻角的变化规律,以及弹丸表面的压力分布和来流速度分布,并对仿真结果进行分析.结果表明,计算所得气动参数符合修正弹外弹道学规律,较好地模拟了弹丸跨音速时的飞行状态,可以为微型修正弹药的制导外形设计提供依据和参考.