枪口压力对水下发射膛口流场特性的影响

张 旋;余永刚;张欣尉

弹道学报 ›› 2021, Vol. 33 ›› Issue (03) : 37-43.

弹道学报 ›› 2021, Vol. 33 ›› Issue (03) : 37-43. DOI: 10.12115/j.issn.1004-499X(2021)03-006

枪口压力对水下发射膛口流场特性的影响

  • 张 旋,余永刚,张欣尉
作者信息 +

Influence of Muzzle Pressure on Muzzle Flow FieldCharacteristics of Underwater Launching

  • ZHANG Xuan,YU Yonggang,ZHANG Xinwei
Author information +
文章历史 +

摘要

为了研究机枪水下发射枪口燃气喷射压力对膛口流场分布特性的影响,基于流体计算软件FLUENT,采用结构化网格并结合动网格技术,建立了水下枪膛口流场二维轴对称仿真模型,针对14.5 mm水下枪,分别采用30 MPa、45 MPa和60 MPa燃气喷射压力对水下密封式发射膛口流场进行了数值模拟。计算结果表明:3种枪口喷射压力条件下,火药燃气喷出膛口后都迅速形成射流膨胀区,膛口轴向压力急剧衰减,燃气扩展过程中受到水和弹丸的较大阻力,在弹后空间聚集,使得压力有不同程度的升高; 燃气喷射压力在30~60 MPa范围内,膛口马赫盘初步形成的时间略有不同,约在145~152 μs之间,压力越小时,马赫盘形成越早且弹丸越早脱离火药燃气的包围; 3种压力条件下马赫盘距离膛口中心位置随时间的变化都呈指数分布规律。

Abstract

In order to study the influence of muzzle gas injection pressure on the distribution characteristics of muzzle flow-field of underwater gun firing,based on computational fluid dynamics software Fluent,a two-dimensional axisymmetric simulation model of underwater muzzle flow-field was established by using structured mesh and dynamic mesh technology. For the 14.5 mm gun,the numerical simulation of the underwater sealed launching muzzle flow-field was carried out with the gas injection pressure of 30 MPa,45 MPa and 60 MPa respectively. The calculation results show that,under the three kinds of muzzle gas injection pressure conditions,a jet expansion zone forms rapidly after the gas is sprayed out of the muzzle,and the axial pressure of the muzzle decreases sharply. The gas expansion process is greatly hindered by water and projectile,resulting in gas accumulation in the space behind the projectile,and the pressure increases again. While the gas injection pressure is in the range of 30~60 MPa,the initial formation of the Mach disk is slightly different. For about 145~152 μs,the smaller the pressure is,the earlier the Mach disk forms,and the sooner the projectile breaks away from the gunpowder gas. Under the three kinds of pressure conditions,the position of the Mach disk at the center of the muzzle distributes exponentially with time.

关键词

机枪 / 水下发射 / 膛口流场 / 马赫盘 / 燃气射流

Key words

machine gun / underwater launch / muzzle flow-field / Mach disk / gas jet

引用本文

导出引用
张 旋,余永刚,张欣尉. 枪口压力对水下发射膛口流场特性的影响. 弹道学报. 2021, 33(03): 37-43 https://doi.org/10.12115/j.issn.1004-499X(2021)03-006
ZHANG Xuan,YU Yonggang,ZHANG Xinwei. Influence of Muzzle Pressure on Muzzle Flow FieldCharacteristics of Underwater Launching. Journal Of Ballistics. 2021, 33(03): 37-43 https://doi.org/10.12115/j.issn.1004-499X(2021)03-006
中图分类号: TJ201   

参考文献

[1] KLINGENBERG G. Gun muzzle blast and flash[J]. Propellants,Explosives,Pyrotechnics,1989,14(2):57-68.
[2]李子杰,王浩. 膛口初始流场对火药燃气射流的影响[J]. 含能材料,2017,25(4):282-290.
LI Zijie,WANG Hao. Effect of precursor flow field of muzzle on the combustion gas jet flow of gun propellant[J]. Chinese Journal of Energetic Materials,2017,25(4):282-290.(in Chinese)
[3]朱冠南,王争论,马佳佳,等. 低压环境下膛口冲击波实验研究[J]. 兵工学报,2014,35(6):808-813.
ZHU Guannan,WANG Zhenglun,MA Jiajia,et al. Research on muzzle shock wave in low pressure environment[J]. Acta Armamentarii,2014,35(6):808-813.(in Chinese)
[4]郭则庆,王杨,姜孝海,等. 小口径武器膛口流场可视化实验[J]. 实验流体力学,2012,26(2):46-50.
GUO Zeqing,WANG Yang,JIANG Xiaohai,et al. Visual experiment on the muzzle flow field of the small caliber gun[J]. Journal of Experiments in Fluid Mechanics,2012,26(2):46-50.(in Chinese)
[5]HARBY K,CHIVA VICENT S,MU(~overN)OZ C J L. An experimental investigation on the characteristics of submerged horizontal gas jets in liquid ambient[J]. Experimental Thermal & Fluid Science,2014,53(2):26-39.
[6]莽珊珊,余永刚. 高压燃气射流在整装液体中扩展过程的实验和数值模拟[J]. 爆炸与冲击,2011,31(3):300-305.
MANG Shanshan,YU Yonggang. Experiment and numerical simulation for high pressure combustible gas jet expansion process in a bulk-loaded liquid[J]. Explosion and Shock Waves,2011,31(3):300-305.(in Chinese)
[7]XUE X C,YU Y G,ZHANG Q. Expansion characteristics of twin combustion gas jets with high pressure in cylindrical filling liquid chamber[J]. Journal of Hydrodynamics,2013,25(5):763-771.
[8]孟祥宇,侯健,魏平,等. 水下枪(炮)发射技术综述[J]. 兵工自动化,2020,39(5):84-89.
MENG Xiangyu,HOU Jian,WEI Ping,et al. A review of underwater gun firing techniques[J]. Ordnance Industry Automation,2020,39(5):84-89.(in Chinese)
[9]刘育平,李金新,杨臻,等. 水下炮内弹道分析与数值仿真[J]. 火炮发射与控制学报,2007(4):30-33.
LIU Yuping,LI Jinxin,YANG Zhen,et al. Analysis and numerical simulation of underwater gun internal ballistics[J]. Journal of Gun Launch & Control,2007(4):30-33.(in Chinese)
[10]张欣尉,余永刚. 水下发射对机枪膛口温度场影响的数值分析[J]. 含能材料,2017,25(11):932-938.
ZHANG Xinwei,YU Yonggang. Numerical analysis for the effect of underwater launch on the temperature field of machine gun muzzle[J]. Chinese Journal of Energetic Materials,2017,25(11):932-938.(in Chinese)
[11]张旋,代淑兰,余永刚,等. 水下机枪密封式发射膛口流场特性分析[J]. 兵器装备工程学报,2019,40(11):60-63.
ZHANG Xuan,DAI Shulan,YU Yonggang,et al. Analysis of flow field characteristics of sealed launching muzzle of underwater machine gun[J]. Journal of Ordnance Equipment Engineering,2019,40(11):60-63.(in Chinese)
[12]赵嘉俊,余永刚. 柱形充液室内多股燃气射流流场的气体与液体两相流场演化特性[J]. 兵工学报,2016,37(10):1852-1859.
ZHAO Jiajun,YU Yonggang. The evolution of gas-liquid flow of multiple combustion gas jets in a cylindrical water-filled chamber[J]. Acta Armamentarii,2016,37(10):1852-1859.(in Chinese)
[13]李鸿志,姜孝海,王杨,等. 中间弹道学[M]. 北京:北京理工大学出版社,2015.
LI Hongzhi,JIANG Xiaohai,WANG Yang,et al. Intermediate ballistics[M]. Beijing:Beijing Institute of Technology Press,2015.(in Chinese)

10

Accesses

0

Citation

Detail

段落导航
相关文章

/