非等温条件下啮合同向双螺杆挤出过程数值模拟分析  

Numerical simulation of meshing co-rotating twin screw extrusion process under non-isothermal conditions

作　　者：赵玉莲 李鑫 安琪 黄志刚[1,2] ZHAO Yu-lian;LI Xin;AN Qi;HUANG Zhi-gang(School oj Material and Mechanical Engineering , Beijing Technology and Business University , Beijing 100048;Plastic Beijing Munici pal Key Laboratory of Health and Sa fety Quality E-ualuatioii Technology , Beijing 100048 , China)

机构地区：[1]北京工商大学材料与机械工程学院,北京100048 [2]塑料卫生与安全质量评价技术北京市重点实验室,北京100048

出　　处：《食品与机械》2019年第4期76-79,共4页Food and Machinery

基　　金：北京市自然科学基金—市教委联合资助项目(编号:KZ201810011017);国家重点研发计划(编号:2016YFD0400305)

摘　　要：采用SolidWorks建立啮合同向双螺杆三维物理模型,通过改变螺杆挤出机加工聚乳酸时的转速,在非等温的模拟条件下,通过polyflow软件对其进行相应的模拟分析,对比不同转速对聚乳酸加工时产生的影响。结果表明:在非等温条件下,温度在挤出方向上线性增加,并且温度在Z轴截面上沿径向向外逐渐增大。通过对比不同转速下的流场分析,发现随着转速的增大,螺槽内出现较大的温差,当转速达到240r/min时,聚合物出现部分降解,对生产加工产生影响;对剪切速率场和黏度场的对比分析也进一步验证了两者的相关性。The SolidWorks 3D modeling software was used to construct the meshing co-rotating twin-screw physical model.By changing the rotational speed of the PLA processed by the screw extruder,the non-isothermal flow analysis was used to carry out the corresponding numerical simulation in the polyflow software.Compare the effect of speed on the processing of PLA.The numerical results show that under non-isothermal conditions,the temperature increases linearly in the direction from the inlet to the outlet,that is,in the extrusion direction.On the Z-axis section,the temperature gradually increases outward in the radial direction.By comparing the flow field analysis at different speeds,it can be concluded that with the increase of rotational speed,there is a large temperature difference in the groove.When the rotational speed reaches 240 r/min,the polymer is partially degraded,which is not conducive to production and processing.The correlation between the shear rate field and the viscosity field is further verified by the comparative analysis.

关 键 词：同向双螺杆挤出机 非等温 转速 剪切速率 黏度 数值分析 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]