啮合同向双螺杆挤出机不同螺杆流场仿真分析

Intermeshing Co-rotating Twin-screw Extruder with Different Screw of Flow Field Simulation Analysis

根据啮合同向双螺杆几何学,运用Solid Works三维建模软件建立螺杆的实体模型。采用190℃聚乳酸熔体作为流体,通过ANSYS软件划分网格得出有限元模型,然后在Polyflow里进行仿真,分别得到了两种不同截面的螺纹元件的流场模拟结果。分析对比了压力场,速度矢量场、剪切速率场和黏度场,得出螺棱厚度对流场的影响。结果表明,I型截面螺杆的建压能力强于II型截面螺杆。II型截面的剪切能力强于I型截面的剪切能力,II型截面增强了螺杆的分散混合能力。

According intermeshing co-rotating twin screw geometry,SolidWorks 3D modeling software was used to establish a solid model of the screw. The melt of poly lactic acid was used as fluid at 190℃ . Finite element model was drawed by ANSYS meshing,flow field simulation results of different cross-section of the threaded elements were obtained by simulation in Polyflow software. Comparative analysis of the pressure field,velocity vector field,shear rate and viscosity field field was conducted. The results show that the build pressure ability of cross section I of the screw is stronger than section II screw. The shear capacity of section II is stronger than section I,section II enhance the dispersive mixing ability.