双螺杆转子结构特性流固耦合数值模拟

以双螺杆转子为研究对象,依据流固耦合理论,通过求解捏合机内部流体和双螺杆转子固体耦合方程,研究不同工况下的流体压力和扭矩对双螺杆转子应力和变形的影响规律。分析计算结果表明:螺杆转子的变形和应力主要是不同工况下的扭矩、流体压力载荷及耦合场作用引起的;螺杆间隙对捏合机的生产效率和质量有很大影响,阴阳螺杆转子最大变形量是设计最佳螺杆间隙的关键因素;一定功率下,转子的最大变形量和最大应力值分别与转子扭矩、流体压力的大小正相关;一定转速下,转子的最大变形量和最大应力值与捏合机功率正相关。研究结果为新型双螺杆捏合机的合理设计与性能预测提供了理论依据。

Research on Numerical Simulation of Structural Characteristics for Twin-Screw Rotors

Based on fluid-solid coupling theory,the effect of different working conditions,such as fluid pressure,torque,on the twin-screw rotors’stress and deformation was studied by solving the fluid solid coupling equations between internal fluid of kneader and the twin-screw rotors.Theoretical analysis shows that the deformation and stress of screw rotors mainly caused by the different working conditions of torque,fluid field pressure,and the effect between coupled fields.From the analysis results,it is concluded that:the effects of the clearance between screw rotors on the performance of kneaders are so important,and the maximum deformation of rotors is one of the key factors to design the best clearance between rotors.Under a certain power,the maximum deformation and stress of rotors are positively correlated with torque of rotors,and positively correlated with the fluid field pressure.Under a certain speed of rotors,the maximum deformation and stress of rotors are also positively correlated with the kneader’s power.The results provide a theoretical basis for performance prediction and reasonable design for the novel twin-screw kneader.