水轮发电机组推力轴承内循环散热系统数值模拟

Numerical Simulation of Thrust Bearing Inner Circulation Cooling System of Hydroelectric Generating Unit

为解决推力轴承瓦温过高问题,采用数值模拟方法分析了国内某水轮发电机组推力轴承内循环散热系统内部流场。结果表明,靠近镜板处油的流速较大,远离镜板处油流速度小;镜板内缘压力最低,沿推力瓦径向向外压力增大;油槽内整体油温分布比较均匀,初始水温、初始油温一定时,随着瓦温降低,整体油温下降的幅度不大。研究结果为推力轴承油循环散热系统的结构优化设计提供参考。

In order to solve the problem of high bearing temperature of thrust bearings,numerical simulation method was used to analyze the internal flow field of the internal circulating cooling system of a thrust bearing in a domestic hydro-generator unit.The results show that the flow rate of oil near the thrust runner collar is large,and the flow rate of oil away from the thrust runner collar is small;The pressure on the inner edge of the thrust runner collar is the lowest,and the pressure increases rapidly outward along the thrust shaft bushing;The overall oil temperature distribution in the oil tank is relatively uniform.When the initial water temperature and the initial oil temperature are constant,the overall oil temperature drop rate is not as great as the temperature of shaft bushing decrease.The research results provide reference for structural optimization design of thrust bearing oil circulating cooling system.