基于多重网格技术的炮射导弹气动数值模拟

Numerical Simulation of Aerodynamics Characteristics of Gun-launched Missile Based on Multi-grid Method

对炮射导弹进行数值模拟研究,是获取导弹气动特性变化规律的有效途径。采用多重网格生成方法,在保持总网格数不大的前提下,可快速获得收敛解。以三维Navier-Stokes方程为出发方程,采用S-A湍流模型,得到较大长径比的炮射导弹气动特性参数。研究结果表明:采用鸭式布局可以提高炮射导弹控制效率;在跨音速阶段压力中心会随着马赫数的增大而前移,使导弹的静稳定度降低;通过增大导弹长径比,可以提高静稳定度。

The gun-launched canard-controlled missile has high control efficiency,but it complicates the aerodynamic characteristics during missile flight,which is more obvious in the transonic range.Numerical simulation is an effective way to obtain the change law of aerodynamic characteristics of missile.The multi-grid method is used to obtain a convergent solution quickly while keeping fewer grids.Based on the three-dimension Navier-Stokes equations closed with S-A turbulence model,the aerodynamic characteristics of gun-launched missile with larger length-diameter ratio were obtained.The research shows that the control efficiency of gun-launched missile can be improved by adopting canard configuration,but the pressure center moves forward with the increase in Mach number in the transonic stage,which reduces the static stability of the missile.The static stability can be improved by increasing the length-diameter ratio of the missile.