摘要
目的:探究啮合异向双螺杆挤出机中螺杆构型的改变对聚乳酸流场的影响。方法:通过Solidworks软件建立异向双头螺纹元件的理论模型和经两种不同方式调整结构参数后的螺纹元件几何模型,将建立的三维模型导入Gambit软件进行网格划分,再应用Polyflow软件进行流场模拟计算,最终借助Fieldview软件提取流场分布结果,对比分析修正时螺纹元件端面上结构参数的调整对剪切速率场、黏度场和速度场的影响。结果:修正时螺纹元件的结构参数经两种方式调整后均会对聚乳酸流场造成影响;两种对结构参数的调整方式均在不同程度上减小了流道内的剪切速率梯度,方式一还造成了流道内聚乳酸的黏度降低。结论:从对剪切速率场、黏度场和速度场的影响上看,经方式一调整后的螺纹元件更有利于挤出,而经方式二调整后的螺纹元件实体构型更贴近螺纹元件理论构型。
Objective:To investigate the effect of the screw configuration on the polylactic acid flow field on the structural parameters of the screw on the end face of the screw in the meshing counter rotating twin screw extruder.Methods:The theoretical model of the heterodirectional double-ended threaded element was established by Solidworks software and the geometry of the threaded element after adjusting the structural parameters in two different ways.The established three-dimensional model was imported into Gambit software for meshing,and then Polyflow software was applied to the flow field simulation calculation.Finally,the flow field distribution results were extracted by Fieldview software,and the effects of the adjustment of the structural parameters on the end surface of the threaded element during correction were compared and analyzed on the shear rate field,viscosity field and speed field.Results:The structural parameters of the threaded element during correction will affect the polylactic acid flow field after being adjusted in two ways.The two adjustment methods of structural parameters have reduced the shear rate gradient in the runner to varying degrees,and the first method has also caused the viscosity of the polymer lactic acid in the runner to be reduced.Conclusion:From the perspective of the influence on the shear rate field,viscosity field and speed field,the threaded element adjusted by mode one is more conducive to extrusion,while the solid configuration of the threaded element adjusted by mode two is closer to the theoretical configuration of the threaded component.
作者
张一惟
黄志刚
商嘉玮
刘忠尧
杨亚楠
ZHANG Yi-wei;HUANG Zhi-gang;SHANG Jia-wei;LIU Zhong-yao;YANG Ya-nan(School of Artificial Intelligence,Beijing Technology and Business University,Beijing 100048,China;Plastic Beijing Municipal Key Laboratory of Health and Safety Quality Eualuation Technology,Beijing 100048,China)
出处
《食品与机械》
CSCD
北大核心
2023年第4期71-76,88,共7页
Food and Machinery
基金
国家自然科学基金面上项目(编号:32172277)。
关键词
啮合异向
双螺杆挤出机
等温
数值模拟
流场
聚乳酸
meshing counter-rotating
twin-screw extruder
isothermal
numerical simulation
flow field
polylactic acid
作者简介
张一惟,男,北京工商大学在读硕士研究生;通信作者:黄志刚(1966-),男,北京工商大学教授,博士。E-mail:huangzg@btbu.edu.cn。
