摘要
为了进一步提升火炮发射弹丸的炮口动能,传统粒状药由于其装填条件的制约,在很大程度上无法满足现代火炮的需求。杆状药以其优异的装填性能得到了广泛的关注,采用杆状药以序列形式进行装填,可以有效调高火药装填密度。对于花边形的多孔杆状药,为更好研究其内弹道性能,采用仿真计算分析其燃烧性能,此过程需要大量辅助方程以保证计算结果的准确性。其中,燃气在序列堆积杆状药床微细孔道内流动的阻力系数是两相流内弹道的重要参数。利用实验装置分别完成氮气在杆状药内孔、花边间隙及装填药床流动的阻力特性实验研究,测量孔道进出口压降以及流量,总结出相间阻力系数f与雷诺数Re与间的关系。在同等条件下,使用Fluent仿真软件对氮气在微细孔道的流动特性进行计算分析,与实验结果吻合较好。在验证此模型的合理性后,将氮气更换为杆状药燃烧生成的火药燃气,结果表明:随着雷诺数Re增大,阻力系数f不断降低,可以拟合出相应的无量纲关系式f(Re),为两相流内弹道计算提供基础。
In order to further improve the muzzle kinetic energy of gun projectiles,the traditional granular charge is restricted by the loading conditions,and can’t meet the charge requirements of modern large-caliber gun to a large extent.Stick propellant has received extensive attention for its excellent loading performance.Loading in sequence with stick propellant can effectively increase the loading density of gunpowder.For the lace-shaped stick propellant,simulation calculation was used to analyze its combustion performance in order to better study its interior ballistics performance.This process requires a large number of auxiliary equations to ensure the accuracy of the calculation results.Among them,the friction coefficient of gunpowder gas flow in the micro-channels of stick propellant bed is an important parameter of two-phase flow interior ballistics.The friction characteristics of nitrogen flow in the inner hole,lace gap and packed bed of stick propellant were studied on experimental device.The pressure drop between inlet and outlet of micro-channels and flow rate were measured,and then the relationship between the interphase friction coefficient and Reynolds number was illustrated.Under the same conditions,the Fluent simulation software was used to calculate and analyze the flow characteristics of nitrogen in the micro-channels.The calculated result is in good agreement with the experimental result.After verifying the rationality of this model,the nitrogen was replaced with the gunpowder gas generated by the combustion of the stick propellant.The results show that the friction coefficient f decreases with the increase of Reynolds number Re,and the corresponding dimensionless relation f(Re)can be generalized which can provide the basis for the calculation of two-phase flow interior ballistics.
作者
王禹博
刘东尧
WANG Yubo;LIU Dongyao(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《弹道学报》
CSCD
北大核心
2022年第3期80-85,共6页
Journal of Ballistics
关键词
杆状药
序列堆积装药
微细通道
相间阻力
stick propellant
accumulated sequence charge
micro-channels
friction characteristics
