椭圆滑动轴承油膜厚度对汽轮机振动的影响  

Effect of Oil Film Thickness of Elliptic Sliding Bearing on Steam Turbine Vibration

作　　者：张艾萍[1] 谢媚娜[1] 林圣强[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9期677-681,共5页Journal of Chinese Society of Power Engineering

摘　　要：为了满足汽轮机对滑动轴承稳定性的高要求,利用Ansys软件分析椭圆滑动轴承油膜厚度对汽轮机振动的影响.首先将UG软件建立的物理模型导入icem软件中进行网格划分,再利用Ansys中CFX模块计算不同油膜厚度下椭圆滑动轴承的油膜压力分布,在Mechanical模块中,分析不同油膜厚度下的油膜特性及其对轴承振动幅值的影响,以实现在Ansys中多物理场的耦合分析.结果表明:汽轮机运行中存在合理区域的油膜厚度,使得汽轮机的振动幅值在允许值内;在相同条件下,椭圆滑动轴承比圆柱轴承的稳定性更好.To meet the high requirements of steam turbine on stability of sliding bearing, the effect of oil film thickness of elliptic sliding bearing on the steam turbine vibration was analyzed using Ansys software. The specific way is to firstly import the physical model established by UG software into icem software for meshing, then to calculate the oil film pressure distribution under different oil film thicknesses with CFX module in the Ansys, and finally to study the oil film property and its influence on the bearing vibration amplitude with Mechanical module, so as to realize multi-physics coupling simulation with Ansys soft- ware. Results show that there exists a reasonable range of oil film thickness, in which the turbine vibration amplitude can be controlled within allowable limits. The elliptic sliding bearing has a higher stability than cylindrical bearing under same working conditions.

关 键 词：滑动轴承 椭圆度 油膜厚度 转子振动 数值模拟 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]