基于有限体积法的弹丸阻力系数数值模拟方法

Numerical Simulation of Projectile Drag Coefficient Based on FVM

配有一维弹道修正引信的受控弹,阻力片伸出后其气动外形较无控弹而言发生很大改变,工程算法求解其阻力系数存在困难。针对这一问题,将有限体积法引入求解弹丸阻力系数的数值模拟中。该方法通过对弹丸周围流场区域进行分块和网格划分,并在每个网格上积分求解N-S方程,来获取弹丸在零攻角不同马赫数下的阻力系数。对比计算数据与试验数据,两者基本吻合,表明该方法具有较高的精度,计算结果可以为外弹道仿真提供参考。

The aerodynamic configuration of one-dimensional trajectory correction fuze changes a lot comparing with the uncontrolled projectile as the damper stretches out. It is difficult to calculate the drag coefficient of pro- jectile by using engineering algorithm. In order to solve this problem, the finite volume method was introduced into the numerical simulation of solving the projectile drag coefficient. With the flow field partitioned and mesh- ed, this method obtained the projectile drag coefficient at zero angle of attack under different Mach number by calculating the navier-stokes equation on each grid with numerical integration. The fact that the calculation re- sults were consistent with the experimental results showed that this method was of high accuracy, calculation re- sults could provide reference for exterior ballistic simulation.