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Numerical Simulation of the Dynamic Mixing Process of HTPB/Al/AP/RDX Solid Propellant
- Acta Armamentarii Vol. 46, Issue 7, Pages: 240611(2025)
- 作者机构：
1. 北京理工大学 宇航学院, 北京 100081
2. 北京理工大学重庆创新中心, 重庆 401100
- 作者简介：
- 基金信息：
DOI：10.12382/bgxb.2024.0611
CLC：Received：22 July 2024，
Published Online：12 August 2025，
Published：31 July 2025
- 稿件说明：
移动端阅览
Mulin HU, WUYi, Xingyuan WANG, et al. Numerical Simulation of the Dynamic Mixing Process of HTPB/Al/AP/RDX Solid Propellant[J]. Acta Armamentarii, 2025, 46(7): 240611.
Mulin HU, WUYi, Xingyuan WANG, et al. Numerical Simulation of the Dynamic Mixing Process of HTPB/Al/AP/RDX Solid Propellant[J]. Acta Armamentarii, 2025, 46(7): 240611. DOI： 10.12382/bgxb.2024.0611.
摘要
混合工艺作为固体推进剂制备的重要工序
一般是指将Al、AP、RDX等颗粒相加入到高分子黏合剂基体中
经机械捏合、搅拌使黏合剂浆料涂敷在固体粒子表面的过程。基于Mixture固-气-液多相流模型
进行固体颗粒相加注混合釜中的扩散伴随桨叶动态捏合过程的数值仿真研究。开展不同固含量(0%~95%)药浆的动态流变测量实验
构建了药浆流变模型;考虑颗粒浓度动态变化对局部流变特性影响
开展了不同颗粒加注流量的混合动态过程仿真。分析不同工况条件下颗粒浓度、压力场和扭矩随时间的变化规律。实验结果表明:建立的数值仿真方法与文献实验结果对比
平均误差在15%内
具有良好的一致性;混合过程中近、远桨叶叶尖处的挤压力最大
而叶中部存在低压区;混合过程中
桨叶扭矩呈锯齿状波动变化
随着颗粒相的加注
扭矩逐渐增大;固体颗粒相加注流量小幅增大时
扭矩变化较小;加注流量大幅增大时
扭矩增幅可达90%。连续加料混合过程中远心桨的扭矩值持续上升
最终平均值可达初始阶段的19倍。所得成果可为固体推进剂的混合工艺效率提升和安全性研究提供参考。
Abstract
The mixing process
as a crucial step in the fabrication of solid propellants
typically involves the incorporation of particulate phases such as aluminum (Al)
ammonium perchlorate (AP)
and RDX into a polymeric binder matrix.The binder slurry is applied onto the solid particles through mechanical kneading and stirring.The dispersion accompanied by dynamic blade kneading during the co-mingling of solid particulate phases in a mixer is simulated based on the Mixture solid-gas-liquid multiphase flow model.Dynamic rheological measurements of slurries with varying solid contents (0%-95%) are performed to construct a rheological model of propellant slurry.Considering the dynamic changes in granular concentration and their impact on local rheological properties
the mixing dynamic processes at different granular injection flow rates are simulated.The analysis focuses on the temporal patterns of granular concentration
pressure fields
and torque under various operating conditions.The results indicate that the proposed numerical simulation method is in good agreement with experimental results in Ref.[39] with an average error of less than 15%.The study reveals that the greatest pressure occurs at the tips of the near and far blades
while a low-pressure zone exists in the middle of the blades.During mixing
the blade torque exhibits a serrated fluctuation
and gradually increases with the addition of the particulate phase.A slight increase in the granular injection flow rate results in a minimal torque change.However
a significant increase in flow rate could lead to a torque increase of up to 90%.In the continuous feeding mixing process
the torque value at the farthest blade from the axis of rotation continues to rise
eventually reaching an average value 19 times that at the initial stage.This research provides insights for enhancing the efficiency and safety studies of solid propellant mixing processes.
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