模具内流道结构对硝基胍发射药成型过程的影响

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英文篇名：Effect of the Mold Inner Flow Channel Structure on the Forming Process of Nitroguanidine Gun Propellant 作者：常飞 ; 朱春鸠 ; 南风强 ; 何卫东 英文作者：CHANG Fei;ZHU Chun-jiu;NAN Feng-qiang;HE Wei-dong;School of Chemistry and Engineering,Nanjing University of Science and Technology; 关键词：发射药 ; 数值模拟 ; 挤出成型 ; 流道结构 英文关键词：gun propellant;;numerical simulation;;extrusion molding;;channel structure 中文刊名：HNCL 英文刊名：Chinese Journal of Energetic Materials 机构：南京理工大学火药装药技术研究所; 出版日期：2018-02-10 14:21 出版单位：含能材料 年：2018 期：v.26;No.148 基金：国防科工局基础产品创新计划(火炸药专项A26201333007);; 国防基础科研计划 语种：中文; 页：HNCL201802009 页数：8 CN：02 ISSN：51-1489/TK 分类号：34-41

摘要

为研究发射药模具内流道结构对硝基胍发射药成型过程的影响,建立了11/7硝基胍发射药模具内流道模型,对以收缩角为30°,45°,60°,成型段长度为25,30,45 mm不同组合的9种方案进行了数值仿真,分析挤压过程中收缩角和成型段长度对剪切速率、压力、速度分布的影响。结果表明,收缩角对不同收缩段和成型段交界面以及近出口等截面的影响相似,都表现出靠近中心模针以及壁面附近处发射药药料剪切速率高于周围部分,截面压力分布均匀,药料流动速度分布呈现中间大两边小的特点;成型段长度对药料流动过程中剪切速率分布影响较大,成型段长度越小,剪切速率越容易发生突变,可能导致非稳态流动;同时确定较优的内流道参数方案为收缩角45°,成型段长度30 mm。
        To investigate the effect of mold inner flow channel structure on the forming process of nitroguanidine gun propellant,the mold inner flow channel model of 11/7 nitroguanidine gun propellant was established. The numerical simulation of nine schemes of different combinations of shrinkage angle as 30°,45° and 60° and forming section length as 25,30 mm and 45 mm was performed. The effect of shrinkage angle and forming section length on the shear rate,pressure and velocity distribution in the extrusion process were analyzed. Results show that the shrinkage angle has similar effects on the interfaces of different contraction sections and forming section and nearing-outlet etc.sections,and it shows that the shear rate of the propellant dough near the center of mold needle and the wall surface is higher than that of the surrounding pare. The sectional pressure distribution is uniform and the flow velocity distribution of the dough has the characteristics of large middle parts and small two sides. The length of forming section has a great influence on the shear rate distribution during the extrusion process of dough. The smaller the length of the forming section,the more likely the sudden change of shear rate,which may lead to the unsteady flow.At the same time,it can be determined that the optimal inner flow channel parameter scheme is the shrinkage angle of 45° and the forming section length of 30 mm.

引文

[1]韩博.高增面性大弧厚硝基胍发射药工艺技术研究[D].南京:南京南京理工大学,2009.HAN Bo.Studies on process technology of high progressive and large web NQ-based gun propellant[D].Nanjing:Nanjing University and Technology,2009.
    [2]季丹丹,刘志涛,廖昕,等.19孔发射药挤出过程的数值模拟与模具优化[J].含能材料.2016,24(11):1114-1120.JI Dan-dan,LIU Zhi-tao,LIAO Xin,et al.Numerical simulation of extrusion process and die optimization for 19-hole propellant[J].Chinese Journal of Energetic Materials(Hanneng Cailiao),2016,24(11):1114-1120.
    [3]丁亚军,应三九.螺杆挤出过程中物料在线流变行为及其数值模拟[J].兵工学报,2015(8):1437-1442.DING Ya-jun,YING San-jiu.In-line rheological behaviors and numerical simulation of material in extrusion processing[J].Acta Armamentarii,2015,36(8):1437-1442.
    [4]唐小军,冯昌林,赵煜华,等.七孔发射药内外弧厚差异对其燃烧性能的影响[J].火炸药学报,2016,39(4):97-101.TANG Xiao-jun,FENG Mao-lin,ZHAO Yu-hua,et al.Effect of inside and outside web thickness difference on the combustion performance of 7-perf granular gun propellant[J].Chinese Journal of Explosives,2016,39(4):97-101.
    [5]Zhou Ke.Numerical simulation for exploring the effect of viscosity on single-screw extrusion process of propellant:ISSST[Z].2014.
    [6]刘林林,马忠亮,高可政,等.变燃速发射药挤出过程中药料流动计算研究[J].含能材料,2010(5):583-586.LIU Lin-lin,MA Zhong-liang,GAO Ke-zheng,et al.Computational study of flow for outside layer of variable-burning rate propellant during extrusion[J].Chinese Journal of Energetic Materials(Hanneng Cailiao),2010(5):583-586.
    [7]张丹丹,何卫东.硝基胍七孔发射药挤压成型过程的数值模拟[J].火炸药学报,2015,38(1):82-86.ZHANG Dan-dan,HE Wei-dong.Numerical simulation of 7-hole nitroguanidine-based gun propellant in extrusion forming process[J].Chinese Journal of Explosives&Propellants,2015,38(1):82-86.
    [8]高可政,马忠亮,萧忠良.变燃速发射药芯料体积流率波动值的数值模拟[J].火炸药学报.2010,33(1):71-74.GAO Ke-zheng,MA Zhong-liang,XIAO Zhong-liang.Numerical simulation of the fluctuation of the volume flow rate of the core of variable burning rate propellant[J].Chinese Journal of Explosives&Propellants,2010,33(1):71-74.
    [9]常飞,南风强,何卫东.多孔硝基胍发射药压伸数值仿真及验证[J].含能材料,2017,25(2):106-112.CHANG Fei,NAN Feng-qiang,HE Wei-dong.Numerical simulation and Verification of nitroguanidine gun propellant[J].Chinese Journal of Energetic Materials(Hanneng Cailiao),2017,25(2):106-112.
    [10]Yang K,Xin C,Yu D,et al.Numerical simulation and experimental study of pressure and residence time distribution of triple-screw extruder[J].Polymer Engineering&Science,2015,55(1):156-162.
    [11]陈富华,胡小秋,刘志涛.基于有限元分析Workbench软件的多孔发射药挤压过程仿真分析[J].兵工学报,2017,38(4):695-703.CHEN Fu-hua,HU Xiao-qiu,LIU Zhi-tao.Workbeneh-based simulation gun propellant in analysis of multi-perforated extrusion process[J].Acta Armamentarii,2017,38(4):695-703.