文献类型：期刊文献

中文题名：等弧厚复杂药型螺压成型模具的模拟仿真研究

英文题名：Simulation study of screw extrusion forming die for complex propellant grains with uniform arc thickness

作者：徐成龙[1];李果[1];王玉[1];谢林生[1];张国辉[2];梁鹏飞[2]

机构：[1]华东理工大学机械与动力工程学院,上海200237;[2]山西北方兴安化学工业有限公司,山西太原030008

年份：2025

卷号：76

期号：8

起止页码：3954

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：;EI(收录号：20253919214293);北大核心:【北大核心2023】；

语种：中文

中文关键词：数值模拟;药柱模具;螺压成型;复杂药型;流动平衡;挤出胀大

外文关键词：numerical simulation;propellant grain die;screw extrusion;complex grain geometry;flow balance;extrusion swelling

摘要：固体推进剂的螺压成型过程具有工艺流程连续、产品质量稳定、自控性强等优点,所制备的推进剂药柱适合大面积推广应用。为了充分提高螺压推进剂的燃烧利用率,针对4种等弧厚复杂药型,设计了不同的螺压挤出模具结构,基于数值模拟的方法,对固体推进剂螺压成型过程进行模拟研究,分析了药料在不同模具结构挤出成型过程中的流场特性和挤出胀大现象,并与实验结果进行对比分析,探究了影响复杂药型精密挤出成型质量的主要因素。研究结果表明:模具出口药料的流动行为很大程度上由模具内的压力分布决定,不同模具结构能够改善药料在横截面内的不均匀流动;分析药料在螺压成型过程的流动平衡系数发现,匹配车轮型药柱的模具结构使药料出口处的流动平衡系数最小,低速区流速为最大流速的42%~56%,且挤出胀大比较小,为1.095,此时药柱成型质量最佳。
The screw extrusion process of solid propellant has the advantages of continuous process flow,stable product quality and strong self-control.The propellant grain produced is suitable for large-scale promotion and application.To fully enhance the combustion efficiency of screw-extruded propellants,this paper focuses on four complex grain geometries with equal arc thickness.Different screw extrusion die structures were designed,and the screw extrusion process of solid propellants was simulated based on numerical simulation methods.The flow characteristics and extrusion swelling phenomena of the propellant material during the extrusion process with different die structures were analyzed.The simulation results were compared with experimental data to explore the main factors influencing the precision extrusion quality of complex grain geometries.The results indicate that the flow state of the propellant material at the die outlet is largely determined by the pressure-building capability of the screw.Different die structures can improve the non-uniform flow of the material within the cross-section.By analyzing the flow balance coefficient during the screw extrusion process,it was found that the die structure matching the wheel-type grain geometry resulted in the smallest flow balance coefficient at the material outlet,with the flow velocity in the low-speed region being approximately 42%—56%of the maximum velocity.Additionally,the extrusion swelling ratio was relatively small at 1.095,indicating optimal grain formation quality.