中国塑料 ›› 2025, Vol. 39 ›› Issue (6): 59-65.DOI: 10.19491/j.issn.1001-9278.2025.06.012

• 加工与应用 • 上一篇    下一篇

幂律流体在单螺杆中的流场特性仿真分析

宋宇谟(), 董立佳(), 李国胜, 王金霞   

  1. 大连橡胶塑料机械有限公司,辽宁 大连 116000
  • 收稿日期:2024-07-02 出版日期:2025-06-26 发布日期:2025-06-20
  • 通讯作者: 董立佳(1998-),男,硕士,工程师,研究领域:单螺杆流场特性仿真研究,15504089553@163.com
    E-mail:songyumo@dxs1907.cn;15504089553@163.com
  • 作者简介:宋宇谟(1992-),男,硕士, 工程师, 主要从事机械设计工作,songyumo@dxs1907.cn

Simulation analysis of flow field characteristics of power law fluid in single screw

SONG Yumo(), DONG Lijia(), LI Guosheng, WANG Jinxia   

  1. Dalian Rubber & Plastics Machinery Co,LTD,Dalian 116000,China
  • Received:2024-07-02 Online:2025-06-26 Published:2025-06-20
  • Contact: DONG Lijia E-mail:songyumo@dxs1907.cn;15504089553@163.com

摘要:

以幂律流体为研究对象,利用数值方法分析幂律流体在三维单螺杆模型中的流动规律,使用ANSYS Polyflow软件实现幂律流体在三维螺杆模型中的流动仿真。采用无量纲表示方式确保结论具有通用性。首先,计算得到不同幂律指数下,螺杆产量与压力梯度的关系,以此验证仿真方法的准确性。随后,提取螺杆螺槽中沿槽深方向的流场特性剖面,包括速度、剪切速率以及黏度,对各个变量在不同幂律指数、不同压力下的特性进行分析。最后对幂律流体流动规律进行结论,其中较为重要的规律为:随着幂律流体的幂律指数不断减小,其流场受压力的影响不断增大,导致螺杆输送能力降低。反映在黏度场上,则是流体在靠近槽上下端面的黏度不断减小,使得流体受螺杆的推进力减小,最终导致输送能力降低,甚至出现逆流。

关键词: 幂律流体, 单螺杆, 熔体输送, 压力流, ANSYS Polyflow

Abstract:

This study focuses on power⁃law fluid dynamics within a three⁃dimensional single⁃screw model. Numerical methods were employed to analyze the flow behavior of power⁃law fluids, and the ANSYS Polyflow software was utilized to simulate their flow patterns in the 3D screw geometry. Dimensionless parameters were adopted to ensure the generalizability of the results. First, the relationship between screw throughput and pressure gradient under varying power⁃law indices was calculated to validate the simulation method’s accuracy. Subsequently, flow field characteristics, including velocity, shear rate, and viscosity profiles along the depth of the screw channel, were extracted and analyzed, with emphasis on their variations under different power⁃law indices and pressure gradients. The study concluded with key findings on power⁃law fluid flow dynamics. Notably, as the power⁃law index decreases, the pressure⁃driven flow field of the fluid intensifies, leading to diminished screw conveying capacity. This is reflected in the viscosity field: reduced viscosity near the upper and lower surfaces of the screw channel weakens the response of fluid to screw⁃induced propulsion, ultimately decreasing conveying efficiency and potentially inducing reverse flow.

Key words: power law fluid, single screw, melt transport, pressure flow, ANSYS polyflow

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