摘要
复合固体推进剂含有固体颗粒较多,传统的有限元分析方法难以准确实现复合固体推进剂在双螺杆挤出过程的仿真模拟。离散单元法(DEM)与计算流体力学(CFD)耦合是一种适合复合固体推进剂生产过程仿真的有效方法,但实现难度很大。基于标定的接触模型参数通过DEM实现了以铝粉和高氯酸铵为主要组分的固体推进剂固体颗粒在双螺杆挤出输送过程的模拟,利用测得液相黏度模型参数通过DEM-CFD耦合计算实现了固体推进剂固体颗粒与液相在双螺杆挤出过程的耦合仿真。结果表明,通过DEM计算得到的固体推进剂固体颗粒在双螺杆中的输送与实验规律相符;对比DEM-CFD耦合仿真与DEM中固体颗粒仿真结果,可见加入了液相的DEM-CFD耦合仿真物料流动性比未添加液相的DEM固体颗粒更好,物料在螺杆输送段的填充率从20%提升到40%,固体颗粒平均输送速度提升150%,螺杆的受力变化不大。
Composite solid propellant contains more solid particles,so it is difficult to accurately simulate the extrusion process of the propellant in twin-screw extruder with traditional finite element analysis method. Whereas,the coupling of discrete element method(DEM)and computational fluid dynamics(CFD)is an effective method for simulation the production process of composite solid propellant,but it is very difficult to implement. In this paper,based on the calibrated contact model parameters,the simulation of solid particles in solid propellant with aluminum powder and ammonium perchlorate as main components in twin-screw extrusion process was realized with DEM,and then the DEM-CFD coupling calculation of the solid propellant solid particles and the liquid phase was realized. The results show that the transportation of solid propellant particles in twin-screw calculated by DEM is consistent with the experimental law. Comparing the results between DEM-CFD coupled simulation and DEM for solid particles,it can be seen that the fluidity of materials was significantly improved by adding the liquid phase The filling rate of materials in the screw conveying section increases from 20% to 40%,and the average conveying speed of solid particles increases by 150%,but the stress of screw does not change much.
作者
王建
刘皓
赵亚风
乔晓林
李兴刚
赵慧
WANG Jian;LIU Hao;ZHAO Ya-feng;QIAO Xiao-lin;LI Xing-gang;ZHAO Hui(Beijing University of Chemical Technology,Beijing 100029,China;Beijing Institute of Aerospace Testing Technology,Beijing 100074,China;Xi′an Aerospace Chemical Propulsion Co.,Ltd,Xi′an 710025,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2022年第2期138-145,共8页
Chinese Journal of Energetic Materials
基金
国防基础科研项目(JCKY2016203A008)
中央高校基本科研业务费专项资金资助(buctrc202005)。
关键词
复合固体推进剂
双螺杆挤出
离散单元法
计算流体力学
耦合仿真
composite solid propellant
twin screw extrusion
discrete element method
computational fluid dynamics
coupling simulation
