弹形变化对超音速下弹丸气动特性的影响  

Bullet-Shape Change on Effect of Aerodynamic Characteristics of Supersonic Projectile

作　　者：沈思颖 陈川琳[1] 吴志林[1] 

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《兵器装备工程学报》2016年第4期15-19,40,共6页Journal of Ordnance Equipment Engineering

摘　　要：通过建立小口径弹丸三维模型,采用混合网格划分方法,运用工程流体软件进行了弹丸外流场数值仿真,并对仿真计算的准确性进行了验证。以某5.8 mm枪弹为基础,改变弹丸外形,弧形部和尾锥部尺寸,计算得到弹丸超音速飞行状态下不同气动力参数,研究弹形变化对其气动特性的影响规律,结果表明:弹形各部分尺寸变化对气动力影响不同,弧形部较尾锥部影响更加明显,而尾锥长度比尾锥角的影响更大。The projectile exterior flow field was simulated by fluid software through the establishment of three dimensional models of small caliber projectile and the hybrid grid method, and the accuracy of simulation was verified. Based on a 5.8 mm bullet, the projectile shape including arc and tail cone size were changed, and the different aerodynamic parameters of projectile flying in supersonic irrotational condition were got. Some effect laws about aerodynamic characteristics caused by bullet-shape change were studied. The results show that the effects of bullet size change on the aerodynamic are different, and the effect of are is more obvious than that of tail cone and the effect of tail cone length is greater than that of tail cone angle.

关 键 词：弹丸 混合网格 弹形变化 气动特性 

分 类 号：TJ011.2[兵器科学与技术—兵器发射理论与技术]