摘要
为求解射表编拟中弹道计算所需的弹丸空气动力系数,采用有限容积法求解N-S方程、S-A湍流模型并考虑具体边界条件,借助FLUENT模拟弹丸外流场。对某型榴弹实现了流场模拟,得到了攻角为0°、4°、8°和马赫数为0.6-2.1时的弹丸阻力系数、升力系数、俯仰力矩系数。通过该弹气动力系数数值模拟计算值与雷达数据提取值、工程计算值、纸靶试验值进行比较,表明数值模拟得到的曲线规律较好。在此基础上,采用阻力、升力符合系数修正方法,实现了数值结果在射表编拟中的应用,且精度满足射表编拟等弹道计算应用的需要。
To achieve the aerodynamic coefficients of the projectiles required in calculating trajectories to compile firing tables,numerical simulation on the outer flow field of the projectiles was performed with the aid of the FLUENT to solve N-S equations and a turbulence model by applying the finite volume method and considering the boundary conditions. Numerical simulation was performed on the outer flow field of the shrapnel with the coefficients of the drag,lift,pitching moment achieved for different angles of attack and different Mach numbers. Through a comparison of the numerical results,the experimental radar data results,engineering estimate results and paper target test results of the aerodynamic coefficients of the shrapnel,it is shown that the aerodynamic coefficients curves obtained by means of the numerical simulation are in good agreement with those of the credibility values. Based on this,by using the modification method on drag and lift coincidence coefficients,the numerical results are successfully applied to the compilation of firing tables with precision meeting the requirement of the ballistic calculations like the compilation of firing tables.
出处
《火炮发射与控制学报》
北大核心
2016年第4期63-67,72,共6页
Journal of Gun Launch & Control
关键词
流体力学
射表编拟
弹丸
气动力
数值模拟
hydromechanics
making firing tables
projectile
aerodynamic
numerical simulation
