啮合同向双螺杆挤出机滑移条件下的仿真分析  

Simulation Analysis of Intermeshing Co-rotating Twin Screw Extruder under Slipping Condition

作　　者：张超[1] 樊瑜瑾[1] 田野 Zhang Chao;Fan Yujin;Tian Ye(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学机电工程学院

出　　处：《塑料科技》2019年第8期71-75,共5页Plastics Science and Technology

摘　　要：双螺杆挤出中的壁面滑移现象在加工过程中具有重要作用,为了探索壁面滑移对流道内物料的影响,利用流体仿真软件Polyflow对螺杆壁面滑移条件下流道内的三维流场作了数值模拟,得出了流道内的压力、速度、剪切速率及黏度的分布。随着最大滑移应力数值的增大,滑移现象消失,流道内的速度场、剪切速率及黏度均受流道几何形状影响,数值波动较大。研究结果表明,壁面滑移条件的产生有利于获得一个较高且稳定的黏度值,提高啮合型同向双螺杆挤出机流率的稳定性,可以有效延长螺杆使用寿命。Wall slippage in twin-screw extrusion plays an important role in the machining process.In order to explore the effect of wall slip on the material in the runner,the fluid simulation software Polyflow is used to simulate the three-dimensional flow field in the runner under the condition of screw wall slip.The distribution of pressure,velocity,shear rate and viscosity in the runner is obtained.With the increase of the maximum slip stress,the slip phenomenon disappears,the velocity field,shear rate and viscosity in the runner are all affected by the runner geometry,and the numerical fluctuations are large.The research results show that the wall slip condition is favorable to obtain a higher and stable viscosity value.The stability of the flow rate of the intermeshing type corotating twin-screw extruder can be increased,and the service life of the screw can be effectively increased.

关 键 词：壁面滑移 流场分析 双螺杆挤出机 稳定性 最大滑移应力 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]