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模具内流道结构对硝基胍发射药成型过程的影响
Effect of the Mold Inner Flow Channel Structure on the Forming Process of Nitroguanidine Gun Propellant
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中文摘要:
      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。
中文关键词: 发射药  数值模拟  挤出成型  流道结构
英文摘要:
      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.
英文关键词: gun propellant  numerical simulation  extrusion molding  channel structure
DOI:10.11943/j.issn.1006-9941.2018.02.004
投稿日期:2017-02-20
最后修改日期:2018-01-22
网络出版日期:2018-02-11
书版出版日期:2018-02-12
基金项目: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
引用文献:常飞,朱春鸠,南风强,何卫东,等.模具内流道结构对硝基胍发射药成型过程的影响[J].含能材料,2018,26(2):130~137
作者单位E-mail
常飞 南京理工大学火药装药技术研究所, 江苏 南京 210094 changfei3120@163.com,nanfq@163.com 
朱春鸠 南京理工大学火药装药技术研究所, 江苏 南京 210094  
南风强 南京理工大学火药装药技术研究所, 江苏 南京 210094 nanfq@163.com 
何卫东 南京理工大学火药装药技术研究所, 江苏 南京 210094  
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