非等温条件下啮合同向双螺杆挤出过程数值模拟分析
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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.
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.
引文
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[11]毕超.Polyflow软件基础及其在双螺杆挤出仿真过程中的应用[M].北京:机械工业出版社,2018:120-152.
[2]张宏建,黄志刚,李梦林,等.啮合同向双螺杆挤出机不同螺杆流场仿真分析[J].工程塑料应用,2016,44(9):70-74.
[3]宁宁,高光涛.加工工艺条件对聚乳酸耐热性的影响研究[J].塑料工业,2012,40(6):53-56.
[4]王琪,王秋,方海峰,等.造纸废料单螺杆挤出机熔融输送流场数值模拟[J].机械设计与制造,2018(2):171-174.
[5]叶阳,成文凯,王嘉骏,等.聚合物反应挤出过程数值模拟进展[J].高分子通报,2018(9):1-7.
[6]胡鹏,罗兵.同向双螺杆支撑元件的流场模拟[J].塑料,2017,46(5):13-17.
[7]孙士强,罗兵,何敏.啮合同向双螺杆螺纹元件几何参数对其在流场中受力关系的影响[J].橡塑技术与装备,2007(4):1-6.
[8]时俊峰,黄志刚,蒋卫鑫,等.聚乳酸在啮合同向双螺杆挤出机机头过渡体的流场研究[J].食品与机械,2017,33(1):72-75.
[9]耿孝正.双螺杆挤出机及其应用[M].北京:中国轻工业出版社,2003:42-52.
[10]陈龙,董力群,张亚军,等.基于SolidWorks API的异向双螺杆的参数化设计[J].中国塑料,2018,32(1):120-124.
[11]毕超.Polyflow软件基础及其在双螺杆挤出仿真过程中的应用[M].北京:机械工业出版社,2018:120-152.