场协同扭转螺杆热输运性能的研究

Study on thermal transport performance of field⁃coordinated torsion screw

应用Polyflow软件,采用数值模拟的方法对创新提出的场协同扭转螺杆在不同转速下的热输运特性进行了仿真分析,结合温度分布、对流换热系数、黏度、压力等参数对其热输运性能进行了系统研究,并与常规螺杆进行对比。结果表明,设置有扭转结构的场协同扭转螺杆温度均匀性得到改善,对流换热系数提高,强化了整个体系的传热效果,其中扭转元件串联排布的螺杆换热性能更优。并以三元乙丙橡胶(EPDM)为原料,采用扭转挤出技术结合机头径向温差、换热系数等参数对常规螺杆与场协同扭转螺杆的传热性能进行了实验研究。所得结果与仿真一致,证明了场协同扭转螺杆具有强化传热、改善塑化均匀性的特性。

The thermal transport characteristics of the innovatively proposed field‐coordinated torsion screw at different rotational speeds were simulated and analyzed through numerical simulation using the Polyflow software,and their thermal transport performance was systematically investigated through combining parameters such as temperature distribution,convective heat transfer coefficient,viscosity,pressure,etc.and compared with conventional screws as well.The results indicated that the temperature uniformity of the field‐coordinated torsion screw with a torsion structure was improved alone with an increase in the convective heat transfer coefficient.The heat transfer effect of the entire system was also strengthened,in which the screw B exhibited the optimal heat transfer performance.Taking EPDM as a raw material,an experimental investigation was performed for the heat transfer performance of the conventional screw and field‐coordinated torsional screw using a torsional extrusion technology combined with the parameters such as radial temperature difference and heat transfer coefficient of the machine head.The obtained results were consistent with the simulation,proving that the field‐coordinated torsion screw can strengthen heat transfer and improve plasticization uniformity.