枪弹外形对阻力特性影响的数值模拟

Numerical Simulation of Influence of Bullet Shape on Bullet Drag Coefficient

运用数值模拟方法计算了不同外形尺寸对某7.62 mm枪弹阻力特性的影响规律。分别计算枪弹在不同头部、尾部尺寸及带刻痕时阻力系数随马赫数的变化,并与标准枪弹外形尺寸下的阻力系数变化规律进行比较。计算表明:头部圆弧直径越大即头部越锐长,阻力系数越小;在一定范围内,尾部锥角越大,阻力系数越小;头部圆弧部的影响大于尾部截锥体的影响。带刻痕时枪弹阻力系数大于标准弹的阻力系数。

The method of numerical simulation was used to calculate influence of bullet size on drag coefficient of one 7. 62 mm bullet. Different head or tail size was calculated and the influence of nick was also considered in the simulation. From the comparison between the drag coefficient data changing with different much numbers in simulation and that calculated under standard bullet size,it is found that the larger the size of head or tail is,the smaller the drag coefficient is and the influence of the head size is larger than the tail size. The coefficient of the bullet with nick is larger than that with standard size.