椭球形头部旋转弹丸外弹道转速衰减规律  

The Rotating Speed Decaying Law in External Ballistic of Ellipsoidal Head Spinning Projectile

作　　者：朱乐乐 王雨时[1] 闻泉[1] ZHU Lele;WANG Yushi;WEN Quan(School of Mechanical Engineering,Nanjing University of Science&Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《探测与控制学报》2021年第6期29-37,共9页Journal of Detection & Control

摘　　要：为了给椭球形头部弹丸及其引信的设计提供较为准确的外弹道环境参数,分别基于空气动力学理论和Fluent软件仿真弹丸极阻尼力矩系数两种方法建立了椭球形头部旋转弹丸的外弹道转速衰减规律数学模型。将两种方法得到的数学模型与弹丸质心外弹道方程联立,借助Matlab软件进行数值解算,得到椭球形头部弹丸外弹道转速衰减规律。将所得结果与外弹道转速衰减经验公式比较,发现上述两种方法得到的弹丸外弹道转速衰减曲线略有差异:基于空气动力学理论得到的弹丸外弹道转速衰减速度比通过仿真弹丸极阻尼力矩系数得到的快;前者得到的衰减规律与用幂函数公式得到的接近,而后者得到的规律则与用指数函数公式得到的接近。通过对比靶场试验结果可知,基于空气动力学理论得到的弹丸外弹道转速衰减规律更准确。In order to provide more accurate external ballistic parameters for the design of an ellipsoidal head projectile and its fuze,the mathematical model of rotating speed decaying law of external ballistic of an ellipsoidal head rotating projectile was established,basing on the aerodynamic theory and Fluent software simulation result about projectile polar damping moment modulus.The mathematical model obtained by these two methods was combined with the exterior ballistic equation of projectile centroid and numerically solved by Matlab software,obtaining the rotating speed decaying law of external ballistic of the ellipsoidal head rotating projectile.After comparing the obtained results with the empirical formula of rotating speed decaying law of external ballistic,it was found that the rotating speed decaying curves of external ballistic obtained by the above two methods were slightly different:the decaying speed of the projectile s external ballistic rotating speed based on aerodynamic theory was faster than that obtained by simulating the polar damping moment coefficient of the projectile;the decaying law obtained by the former method was closer to that obtained by the power function formula,while the law obtained by the latter method was closer to that obtained by the exponential function formula.By comparing to the results of the range test,the rotating speed decaying law in external ballistic based on the aerodynamic theory was more accurate.

关 键 词：椭球形头部弹丸 外弹道 转速衰减 数值计算 数值仿真 

分 类 号：TJ43[兵器科学与技术—火炮、自动武器与弹药工程]