基于有限体积方法,对嵌入式行星单螺杆熔体输送段流场进行三维等温数值模拟。通过简化的物理模型来模拟行星螺杆复杂的几何结构,使用用户自定义程序设定了行星螺杆运动的边界条件。通过对嵌入式行星螺杆挤出机内螺槽压力、速度、形变速率张量、拉伸强度的分析,表明行星螺杆速度都有周期性的波动,嵌入式行星螺杆平均形变速率更高并且伴有强的拉伸场作用。通过停留时间分布曲线分析,嵌入式行星螺杆内物料停留时间分布曲线较普通单螺杆更窄,同等转速下产量更高。
The numerical simulations of three-dimensional isothermal flow in a embedded planet-screw is carried out using finite-volurne approach. The boundary conditions of planet screws were imposed by user define function （UDF） developed by ourselves. The distributions of the velocity, pressure obtained from the strain rate and residence time distribution（RTD） are investigated for single-screw and planet-screw. Compared with the conventional single- screw extruder, the planet-screw leads to perturbation on the flow field and the material elements are suffered higher strain rate and elongation effect. After analysis the residence time distribution curve, it is found that the residence time distribution in the planet-screw is narrower than in the conventional single-screw extruder, so the planet-screw can has a higher output with the better extrusion characteristic performance.
参考文献
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