带有反向螺纹元件的四螺杆挤出机流道内三维流场分析  

Three-Dimensional Flow Field Analysis of Four-Screw Extruder with Reverse Threaded Element

作　　者：左晓甜 郭树国[1] 金子云 ZUO Xiaotian;GUO Shuguo;JIN Ziyun(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Liaoning Shenyang 110142,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,辽宁沈阳110142

出　　处：《饲料工业》2023年第24期30-35,共6页Feed Industry

基　　金：辽宁省自然科学基金项目[No.2019-ZD-0085、No.2021-MS-253、No.2022-MS-288]。

摘　　要：研究设计了带有反向螺纹元件的四螺杆挤出机,改善传统四螺杆挤出机混合、剪切效果不均匀的情况。使用Solid works软件建模,螺杆以正方形方式排列;利用ANSYS/CFX软件分析物料在带有反向螺纹的四螺杆挤出机流道内的运动状态,对比新型螺杆与传统螺杆流道的压力、速度矢量、速度流线图等变化,探究物料在流道内的剪切、混合情况。结果表明:在外部情况相同时,新型四螺杆挤出机因为安装反向螺纹元件,螺杆出现背压,建压能力减弱;反向螺纹元件阻碍了物料输送,物料的输送速度减小,增加了物料在挤出机内的停留时间;在螺杆啮合中心区域,产生反向速度流线,混炼区域中心形成反向涡流,使物料产生回流,加强了物料的混合效果和剪切效果。A four-screw extruder with reverse-threaded elements was designed to improve the uneven mixing and shearing effect of conventional four-screw extruders.Modelling using Solid works software,with the screws arranged in a square pattern.ANSYS/CFX software was used to analyse the movement of material in the flow channel of a four-screw extruder with a reverse threaded,comparing the changes in pressure,velocity vector and velocity flow diagram between the new screw and the conventional screw flow channel to investigate the shearing and mixing of material in the flow channel.The results showed that the new four-screw extruder has a reduced pressure building capacity due to the installation of re-verse threaded elements and back pressure on the screw in the same external situation;reverse threaded elements hinder material transport,reduce the transport speed of the material and increase the residence time of the material in the extruder;in the central area of the screw engagement,a reverse velocity flow line is generated and a reverse vortex is formed in the centre of the mixing area,which causes the mate-rial to flow back and enhances the mixing effect and shearing effect of the material.

关 键 词：反向螺纹 三维流场 四螺杆挤出机 反向涡流 剪切效果 混合效果 

分 类 号：S817.124[农业科学—畜牧学]