某灵巧枪弹气动特性数值计算分析

Numerical Evaluation and Analysis of Aerodynamic Characteristics of Certain Type Smart Bullet

为提高枪弹的命中精度,对一种增程灵巧枪弹的气动特性数值计算进行分析。建立枪弹计算模型,应用气动仿真软件FLUENT,采用数值仿真的方法,分析弹头及弹尾外形尺寸变化对灵巧枪弹气动特性的影响规律,并以国外枪弹为基础对其进行算例验证。仿真结果证明了该数值仿真方法的准确性,可为枪弹气动特性分析提供参考依据;随着弹尖半径的增加,枪弹阻力系数逐渐增大,升力及俯仰力矩系数的变化并不明显;随着圆弧部半径的增加,枪弹阻力系数增大,升力系数减小,俯仰力矩系数增大,枪弹纵向静稳定性减弱;随着交界处半径的增加,枪弹阻力系数减小,升力系数减小,俯仰力矩系数增大,枪弹纵向静稳定性减弱。

In order to improve the hitting accuracy of guns and bullets,the numerical calculation of the aerodynamic characteristics of a new extended range smart bullet is analyzed.Establish a bullet calculation model and apply the pneumatic simulation software FLUENT.The influence of the shape of warhead and tail on the aerodynamic characteristics of smart bullet is analyzed by numerical simulation and validated on the basis of foreign bullets.The simulation results show that this method is correct and it can provide reference for the analysis of the aerodynamic characteristics of projectiles.With the increase of tip radius,the drag coefficient increases,the lift coefficient increases first and then decreases,and the pitching moment coefficient decreases first and then increases.With the increase of arc radius,the drag coefficient increases,the lift coefficient decreases,the pitching moment coefficient increases,and the longitudinal static stability decreases.With the increase of the radius at the intersection,the drag coefficient decreases,the lift coefficient decreases,the pitching moment coefficient increases,and the static stability decreases.