中文摘要：

基于FLUENT软件,对聚合物熔体在三螺杆挤出机（TTSE）中的流动规律进行了三维模拟,利用示踪粒子技术分析了聚合物熔体在螺杆内的流动与混合规律,求解得出了聚合物熔体在三螺杆挤出机中的剪切速率分布云图、混合指数云图以及聚合物在流道内的停留时间分布（RTD）,并与双螺杆挤出机（TSE）的混合性能进行了对比分析。模拟结果表明,三螺杆挤出机的分散混合能力与分布混合能力都强于双螺杆挤出机,同时,由于中心环流区的存在使得物料在三螺杆挤出机的停留时间更长。因此,三螺杆挤出机在今后的实际生产应用中会有较好的前景。

英文摘要：

Based on FLUENT software, a three-dimensional simulation of polymer melt＇s flow pattern in the threescrew extruder（TTSE） was carried out, with the flow pattern and mixing pattern of polymer melt within the screw analyzed.Polymer melt＇s shear rate distribution map, the mixing index distribution map in three-screw extruder were obtained as well as polymer＇s residence time distribution（RTD） within the runner and were compared and analyzed with the mixing performance in twin-screw extruder（TSE）. Results show that the dispersive mixing capability and distribution mixing capability of three-screw extruder were stronger than those of the twin-screw extruder, while the residence time of materials was longer because of the presence of the central circulation zone in the three-screw extruder. Therefore the three-screw extruder would have good prospects in practical production and application in the future.