Analysis On Oil-Film Characteristics Of Bearings For Large Scale Steam Tbrbo-Generator Unit

Steam turbine generator set is a core equipment of power industry. And the stable operation of the foresaid generator set is directly affected by the performance of its plain bearings. Therefore, this paper focuses on the study of oil film characteristics of plain bearings, which has great significance for ensuring the stable operation of the whole generator set.This paper studies the plain bearings of a large turbo-generator set, figuring out and analyzing the oil film characteristics of plain bearings by using a method named Computational Fluid Dynamics. In this study, the author mainly focuses on three aspects. Firstly, the author establishes different physical and mathematical models, corresponding to cylindrical bearing, elliptical bearing and tilting-pad bearing. Then the author figures out the respective pressure distribution of the bearing films through calculations, then makes coMParative analysis of their pressure characteristics, and then concludes the stability of the three kinds of plain bearings. Secondly, taking the elliptical bearing of a600MW generator set as research object, the author studies the iMPacts of such factors as revolving speed, oil-taking pressure and ovality, on the pressure characteristics and temperature characteristics of oil film of the research object. Resultantly, a perfect ovality, which can guarantee the stable operation of the bearing, can be found. Thirdly, the author makes calculations and analysis of the oil film of a titling-pad bearing, and figures out its pressure characteristics under different working conditions by adjusting its revolving speed, bearing numbers and carrying mode. Thus this paper reveals the impacts of the foresaid factors on the carrying capacity and stability of the bearing. Moreover, this paper provides theoretical support for the stable operation of large turbo-generator sets and the related works about bearing design.