为了探索连续化生产工艺中变燃速发射药尺寸波动的影响因素,选择硝化棉与溶剂的体积比为1/1.35和1/1.50的单基药物料为挤出物,采用Bird-carreaulaw模型对不同操作条件下挤出物共挤段流动情况进行了数值模拟.研究结果表明:螺杆转速波动对变燃速发射药尺寸精度影响比人口压力大,主要体现在对交界面半径的影响上;入口压力波动对变燃速发射药尺寸精度有所影响,特别在20∶30的螺杆转速组合下对变燃速发射药尺寸波动影响较大;减小芯料和皮料入口压力波动、适当提高芯料入口压力、减少芯料溶剂量及增加皮料溶剂量都有利于提高变燃速发射药尺寸精度.%In order to explore the factors affecting the size fluctuation for the variable-burning rate propellant in the co-extension process,numerical simulation method was used to simulate the flow under different operating conditions. Results show that the screw velocity fluctuation has more influence than the entrance pressure fluctuation on the size fluctuation of the variable-burning rate propellant,especially have an influence on the interface radius. The entrance pressure fluctuations have an impact on the size fluctuation of the variable-burning rate propellant,especially when the screw velocity combination is 20 : 30. The decrease of the entrance pressure fluctuation of the inside layer and outside layer materials, and increase of the entrance pressure of the inside layer materials properly, and reducing the solvent content of the inside layer materials and enhance the solvent content of the outside layer materials will be helpful to improve the precision of grain size for the variable-burning rate propellant.
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