小口径步枪弹头后效期运动特性试验与数值研究

doi:10.3969/j.issn.1000-1093.2019.02.006

摘要/Abstract

摘要： 开展弹头在膛口流场运动特性的研究，在准确理解膛口气流对弹头作用以及提高武器射击精度方面都具有重要意义。以某发5.8 mm口径步枪弹为例，提出了结合高速摄影与阴影照相法，对弹头在膛口流场运动特性进行了试验研究。以试验测试膛压数据为依据，运用耦合内弹道的计算流体力学方法研究弹头在膛口流场中的受力和运动规律。试验结果表明，采用所设计的试验方案可以捕捉到后效期清晰的流场变化和弹头运动。数值计算研究发现：弹头在膛口流场中的运动并非全程加速，冠状气团和火药核心射流的作用是弹头速度变化的主要原因；在轴向力转变时刻，弹头底部仍存在弹底激波。

关键词: 小口径枪弹, 膛口流场, 后效期, 阴影照相法

Abstract: The study on the motion characteristics of bullet in muzzle flow field is of great practical signi- ficance to the better understanding of the effect of muzzle flow on a bullet, and it also has a realistic meaning for improving the firing accuracy of weapon systems. The high-speed photography and shadowgraph method are used to study the motion characteristics of 5.8 mm bullet in the muzzle flow field. Based on chamber pressure data observed in experiment, the force and motion of bullet in muzzle flow field are studied by using coupled interior ballistic computational fluid dynamics method. The experimental result shows that the clear flow field and bullet motion can be captured by using the designed test scheme; the numerical calculation indicates that the motion of bullet in the muzzle flow field is not always accelerated. The effects of the coronal air mass and the core jet of propellant gas are the main cause to lead to the change in bullet velocity. At the moment of axial force conversion, there is still shock wave at the bottom of the bullet. Key

Key words: smallcaliberbullet, muzzleflowfield, aftereffectperiod, shadowgraphmethod

中图分类号:

陈川琳，黄陈磊，许辉，李忠新，吴志林. 小口径步枪弹头后效期运动特性试验与数值研究[J]. 兵工学报, 2019, 40(2): 265-275.

CHEN Chuanlin， HUANG Chenlei， XU Hui， LI Zhongxin， WU Zhilin. Experimental and Numerical Research on Motion Characteristics of a Small Caliber Bullet in Muzzle Flows[J]. Acta Armamentarii, 2019, 40(2): 265-275.

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第40卷第2期
2019 年2月兵工学报ACTA
ARMAMENTARIIVol.40No.2Feb.2019

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