三油楔滑动轴承油膜压力特性及对转子稳定性的影响  

Influence of Three-lobe Journal Bearing's Oil Film Pressure Property on the Rotor Stability

作　　者：张艾萍[1] 林圣强[1] 谢媚娜[1] 

机构地区：[1]东北电力大学能源与动力工程学院,吉林132012

出　　处：《动力工程学报》2013年第6期437-442,共6页Journal of Chinese Society of Power Engineering

摘　　要：采用CFD软件、考虑黏性流体有旋性的SST湍流计算模型和N-S方程研究了三油楔滑动轴承的油膜压力特性,分析了三油楔滑动轴承对汽轮机转子稳定性的影响,并对三油楔滑动轴承、圆柱轴承与椭圆轴承的油膜压力特性进行了对比分析.结果表明:在相同油膜厚度和进口压力下,三油楔滑动轴承比圆柱轴承和椭圆轴承具有更好的稳定性,不容易出现油膜震荡和失稳现象;在相同油膜厚度和偏心率下,椭圆轴承的承载能力大于三油楔滑动轴承的承载能力,但三油楔滑动轴承更有利于汽轮机转子和机组的稳定运行.Using CFD software, and considering the SST turbulence calculation model and N-S equation for rotation property of viscous fluid, the oil film pressure distribution of three-lobe journal bearing was stud- ied so as to analyze its influence on the stability of steam turbine rotors, and to carry out a comparative analysis of the oil film pressure distribution among the three-lobe journal bearing, the cylindrical bearing and the elliptical bearing. Results show that, under the same conditions of oil film thickness and inlet pressure, the three-lobe journal bearing has the highest stability among the three kinds of bearing, which is hard to cause oil film oscillation and instability; under the same conditions of oil film thickness and eccen- tricity, the bearing capacity of elliptical bearing is better than that of the three-lobe journal bearing, however, the latter one is more helpful to stable operation of turbine rotors and power units.

关 键 词：三油楔滑动轴承 转子稳定性 油膜压力特性 CFD 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]