双螺杆捏合机螺杆转子多场耦合特性数值模拟  

STUDY ON THE NUMERICAL SIMULATION OF MULTI-FIELD COUPLING CHARACTERISTICS FOR ONE NOVEL TWIN-SCREW KNEADER

作　　者：魏静[1] 梁新龙[1] 孙旭建[1] 孙伟[1] 

机构地区：[1]大连理工大学机械工程学院,大连116024

出　　处：《机械强度》2013年第5期617-622,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金(50905023;51275553);中国博士后科学基金面上项目(20100471443;201104597)资助~~

摘　　要：以某新型双螺杆捏合机螺杆转子为研究对象,采用间接耦合以及弱耦合方法实现转子温度场和应力场、流场和应力场的耦合特性的数值模拟。将温度场作为体载荷施加在流固耦合结果上,实现螺杆转子温度场-流场-应力场的多物理场耦合特性数值模拟,以研究不同工况下在流场温度、流体压力和不同扭矩对双螺杆转子的综合应力和综合变形的多场耦合作用机理,并对螺杆转子在各物理场单独作用及耦合作用下的应力和变形情况进行对比分析。研究结果表明:与流场对转子产生的变形与应力相比,热变形是导致转子实际变形的主要因素,螺杆转子热变形的变化趋势与其实际综合变形的变化趋势基本一致,而由温度场导致的转子热应力值较小,远小于转子受到流场以及扭矩产生的应力值。根据分析结果可以确定双螺杆捏合机中对转子强度、刚度起主要影响作用的因素,以及确定转子合理工作间隙。研究结果对转子微观形貌的主动反演设计以及工作间隙的合理选择提供理论依据。The temperature and stress field coupling and flow and stress field coupling for a novel twin-screw kneader are carried out by adopting indirect and weak coupling method. The temperature field is exerted on the results of fluid-solid coupling as an external load to achieve the numerical simulation of structural characteristics of Heat-Fluid-Structure coupling. Furthermore, the effects of different working conditions, such as different flow field temperatures, fluid pressures and torques on the overall integrated stress and deformation of the twin-screw rotors are studied. The stress and deformation of the screw rotors are analyzed when respectively considering the fluid temperature, fluid pressure and torque as well as their coupling effects. The results show that ： thermal deformation is the main factor compared with the deformation caused by the fluid field and the tendency of thermal deformation is in accordance with that of overall integrated deformation. And the thermal stress caused by temperature field is smaller than that caused by fluid field and torque. The main influential factors on strength and stiffness of the rotors as wall as the reasonable working clearance are obtained. The results in this study provide a theoretical basis for inversion design of microstructure and reasonable working clearance of twin-screw kneaders.

关 键 词：双螺杆捏合机 多场耦合 数值模拟 热-流-结构耦合 

分 类 号：TH122[机械工程—机械设计及理论]