基于Fluent的火炮减后坐喷管数值计算与分析  

Numerical calculation and analysis of gun recoil nozzle based on fluent

作　　者：薛滨 何永[1] 胡元涛 XUE Bin;HE Yong;HU Yuantao(School of Mechanical Engineering, Nanjing University of Science & Technology, Nanjing 210094, China)

机构地区：[1]南京理工大学机械学院,南京210094

出　　处：《兵器装备工程学报》2022年第6期162-168,共7页Journal of Ordnance Equipment Engineering

摘　　要：针对小口径高射速火炮发射时威力与后坐力的匹配问题,建立了喷管减后坐模型,重建了内弹道程序,利用计算流体动力学软件Fluent对喷管进行了流场仿真。为保证仿真结果的真实性,将喷管划分为导气管和直喷管2个区域,建立了导气管转角的三维流体模型和直喷管的二维轴对称流体计算模型,并利用用户自定义函数编写UDF嵌入Fluent进行耦合计算。仿真结果表明,采用喷管减后坐装置时炮弹初速降低8%就可获得17.3%的后坐效率。为火炮喷管的减后坐及与膛口制退器的减后坐耦合研究提供了理论支撑。Aiming at the problem that the power and recoil do not match when the small-caliber high-rate gun is fired,a nozzle recoil subtraction model was established,the interior ballistic program was reconstructed,and the flow field of the nozzle was simulated by the computational fluid dynamics software Fluent.In order to ensure the reality of the simulation results,the nozzle was divided into two regions:nozzle angle and straight nozzle,and a three-dimensional fluid model of nozzle angle and a two-dimensional axisy-symmetric fluid calculation model of straight nozzle were established.UDF embedded in Fluent was written by user defined functions for coupling calculation.The results show that 17.3%recoil efficiency can be obtained when the muzzle velocity is reduced by 8%.The theoretical basis is provided for the research of the subtraction recoil of the nozzle and the coupling of the subtraction recoil with the muzzle brake.

关 键 词：威力 喷管 减后坐 流场仿真 耦合 

分 类 号：TJ303.4[兵器科学与技术—火炮、自动武器与弹药工程]