离心式压缩机转子过盈配合的弹塑性接触分析

Analysis on elastoplastic contact problem in interference fits of centrifugal compressor rotor

为了更合理地确定离心压缩机叶轮与轴之间的配合关系,综合研究了叶轮外径及转子转速对接触应力的影响,并提出相应的装配过盈量计算模型。叶轮外径沿轴向方向呈一定的规律变化,轴向方向上不同位置叶轮的刚度随之变化,进而影响接触应力和位移;叶轮因转速产生径向位移,进而对接触应力形成减小效应,接触应力的减少程度与转速及轴向不同位置的叶轮结构有关;综合考虑叶轮轴径和转速的影响,结合压缩机转子接触应力和轴向力矩约束条件,提出了最优过盈量计算模型。基于Abaqus的分析结果验证了理论模型的合理性。

In order to determine the relationship between cen- trifugal compressor impeller and shaft more reasonably, the contact stress influenced by the impeller diameter and the rotor speed wasstudied comprehensively, and the computation model of assembly interference was put forward. Impeller diameter shows a certain rule of changes along the axial direction, the stiffness of the dif- ferent positions of the impeller also changes in the axial direction, and affect the contact stress and displacement. The radial dis- placement which is effected by impeller speed reduces the contact stress. The reducing degree varies with the speed and impeller structure of different axial position. The calculation model of the optimal amount of interference was put forward by considering the impact of the impeller shaft, the rotational speed and the constraints of the rotor contact stress, axial torque. The theoretical model was verified reasonably by the results based on the analysis of Abaqus.