差速平行同向三螺杆挤出机混合特性分析
Analysis of Mixing Characteristics of Differential-speed Parallel and Co-rotating Three-screw Extruder
针对差速平行同向三螺杆挤出机混合特性研究的不足,建立3种速比配置(1∶1∶1、2∶1∶2、1∶2∶1)的三螺杆三维模型,采用Bird-Carreau非牛顿流体模型和混合网格划分方法数值模拟流场压力、速度分布及混合性能。结果表明:在压力场方面,差速螺杆组2和螺杆组3的轴向压力梯度较等速螺杆组1分别降低5.26%和4.95%,压力分布更均匀。在速度场方面,差速构型的最大速度达到0.36~0.37 m/s,较等速构型提升80%以上。在分布混合性能方面,螺杆组3的分布指数最低,螺杆组2的分离尺度最小,差速构型的平均停留时间较等速构型显著缩短。在分散混合性能方面,螺杆组3的平均最大剪切应力最高,剪切应力分布范围最广,表现出最优的分散能力。综合来看,差速设计效应显著提升混合效率,其中螺杆组3的综合性能最优,适用于高精度分散混合,而螺杆组2则更适合高效连续生产。研究结果证实差速设计可显著提升混合效率,为高性能聚合物材料加工提供参考。
To address the research gap on the mixing characteristics of a differential parallel co-rotating three-screw extruder, three-dimensional models of three screw speed configurations (1∶1∶1, 2∶1∶2 and 1∶2∶1) were established. The flow field pressure, velocity distribution, and mixing performance were numerically simulated using the Bird‑Carreau non‑Newtonian fluid model and a hybrid mesh generation method. The results showed that in terms of the pressure field, the axial pressure gradients of screw group 2 and crew group 3 with differential-speed design were reduced by 5.26% and 4.95%, respectively, compared with screw group 1 with constant‑speed design, leading to a more uniform pressure distribution. Regarding the velocity field, the maximum velocity of the differential configurations reached 0.36~0.37 m/s, which was more than 80% higher than that of the constant‑speed configuration. Concerning distributive mixing performance, screw group 3 exhibited the lowest distribution index, screw group 2 showed the smallest separation scale, and the mean residence time of the differential designs was significantly shorter than that of the constant‑speed design. For dispersive mixing performance, screw group 3 achieved the highest average maximum shear stress and the broadest shear stress distribution, indicating the best dispersive capability. Overall, the differential design effect significantly improved mixing efficiency. Screw group 3 demonstrated the best overall performance and was suitable for high‑precision dispersive mixing, whereas screw group 2 was more appropriate for efficient continuous production. The results confirmed that the differential design can remarkably enhance mixing efficiency, providing a reference for the processing of high‑performance polymer materials.
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辽宁省自然科学基金项目(2022-MS-288)
2024年辽宁省教育厅高校基本科研项目(LJ212410149018)
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