局部预负荷对可倾瓦轴承性能的影响  

Effects of Local Preload on the Performance of Tilting Pad Bearings

作　　者：祝剑虹 许永利 ZHU Jianhong;XU Yongli(School of Energy Engineering,Zhejiang University,Zhejiang 310037,China;Zhejiang Shenfa Bearing Co.,Ltd.,Zhuji 311800,Zhejiang Province,China)

机构地区：[1]浙江大学能源工程学院,杭州310037 [2]浙江申发轴瓦股份有限公司,浙江诸暨311800

出　　处：《动力工程学报》2018年第7期539-544,共6页Journal of Chinese Society of Power Engineering

基　　金：2016年度浙江省省级引智资助项目(Z20160082)

摘　　要：为研究局部预负荷系数对可倾瓦轴承性能的影响,基于热弹流动力润滑理论建立了一种局部预负荷系数可变的可倾瓦轴承模型,研究了某高速燃气轮机五瓦可倾轴承的局部预负荷系数对轴承的影响。结果表明:可倾瓦轴承刚度、阻尼系数随瓦块预负荷系数的增大而增大,不同方向刚度、阻尼系数受影响程度与瓦块支点位置有关;对于局部预负荷系数变化方向上的相关瓦块,最高瓦温、瓦面最高压力随局部预负荷系数的增大而升高,最小油膜厚度的变化刚好相反,且这些瓦块受影响程度要远大于其他瓦块;局部瓦块预负荷系数增大,轴承静平衡位置向远离瓦面的方向移动,反之则向靠近瓦面的方向移动;随局部预负荷系数的增大,润滑油流量减小,轴承功耗增大。To study the effects of local preload on the performance of tilting pad bearings,a model was established for the bearing based on thermo-elasto-hydrodynamic lubrication theory,which was applied to the analysis of a five-pad tilting-pad bearing for a high-speed gas turbine.Results show that the stiffness and damping of a tilting pad bearing increase with the rise of local preload,which are affected by the location of pad pivots in different directions.For the pads in the direction with changing local preload,their maximum babbit temperature and pad pressure increase with rising local preload,while the minimum thickness of oil film decreases,and the influence on these pads would be greater than those in other directions.If local preload rises,the static equilibrium position would move away from the pad,which will move towards the pad if the local preload decreases.The lubrication oil flow reduces with rising local preload,resulting in increased power loss of the bearing.

关 键 词：燃气轮机 可倾瓦轴承 局部预负荷 热弹流分析 

分 类 号：TH133.3[机械工程—机械制造及自动化]