三角形排列三螺杆反应器挤出特性的数值模拟

三角形排列三螺杆反应器是一种新型的多螺杆挤出设备，对其结构的设计和挤出工艺的研究还处于起步阶段。利用CFD法对聚合物熔体在三角形排列三螺杆反应器中的流动规律进行了计算机模拟，分析了物料在三螺杆中心区的流动和混合情况。计算了三螺杆反应器的螺杆挤出特性参数，并和双螺杆反应器进行了对比分析。结果表明，最小轴向速度并未出现在最大面积的中心区内，而是出现在最小面积的中心区内，三螺杆反应器的流动死区出现在最小面积中心区。与双螺杆反应器相比，三螺杆反应器具有较强的物料输送能力、塑化和混合能力；同时，三螺杆反应器的产能比又大于双螺杆和四螺杆反应器，因此，三螺杆反应器具有较好的工程应用前景。

Numerical Simulation of Extrusion Characteristics of Triangle Arrayed Triple Screw Reactor

Triangle arrayed triple screw reactor （TATSR） is a newly multiple screw equipment of polymer processing. The studies about structural design and extrusion technics of TATSR are still in the initiatory conditions. Based on Computational Fluid Dynamics （CFD） method, the polymer melt flow in TATSR was simulated by computer. The mixing and flow of polymer melt in special central region of TATSR were also studied. Moreover, the extrusion characteristics of TATSR were calculated and compared with those of twin screw and four screw reactor. The results show that the minimal axial velocity of polymer flow have appeared in central region with small area but not in that with big area. The flow dead zone is in the center of the central region with big area. By comparison, the TATSR has higher efficiency of pumping, plasticization and mixing than that of twin screw reactor. At the same time, the productivity ratio of TATSR is bigger than that of twin screw and four screw extruder. So TATSR has a good outlook of engineering application.