新型同向双螺杆元件——S型元件研究(Ⅰ)——流场数值模拟

Study on a New Type "S" Element of Co-Rotating Twin Screw Extruders (Ⅰ) ──Field Simulation

对一种作者设计的新型同向双螺杆元件———S元件进行了流场计算。建立了三维非牛顿等温流场模型 ,利用ANSYS软件和自行编程计算了元件流场中的压力场、挤出量、回流量、速度场、剪切速率和拉伸速率 ,并对S形元件的流场与常规螺纹元件的流场作了一定的比较。在后续的文章中将对S形元件的流场及常规螺纹元件的流场计算结果进行实验验证。

A three-dimensional non-newtonian isothermal flow field model is established for a new type of screw element 'S' in intermeshing co-rotating twin-screw extruders. Velocity profile and pressure profile are obtained by using FEM package ANSYS. Post-processing software is developed to calculate the throughput, backflow, shear rate and elongation rate. In order to search the differences between S elements and common screw elements, a comparison is made. In part two of this paper, experimental verification of 'S' element's melting and mixing will be shown.