Influence of sealing structure of generator bearing oil groove on oil mist leakage
The problem of oil mist leakage of bearing oil grooves in large hydropower stations is always inevitable.Improving the sealing structure is usually the simplest and most effective measure to solve the problem of oil mist leakage in bearing oil grooves of hydropower stations.In order to reduce the pol-lution caused by oil mist leakage inside the generator,the problem of oil mist dumping in the generator bearing of a pumped storage power station was taken as research object.The sealing cover of the oil tank was modified,and the numerical simulation of oil mist multiphase flow in the sealed cavity was carried out.The flow field distribution characteristics of the original sealing structure and the two im-proved sealing structures were analyzed using the Mixture model and SST k-ω model,and the oil mist leakage situation under different sealing structures was evaluated.The results show that compared with the original design model,the oil mist leakage of the improved models Ⅰ and Ⅱ is reduced by 18.9％and 88.6％,respectively and the improved model Ⅱ has the most significant effect on oil mist leakage.The injection of high-pressure gas will destroy the original annular vortex in the sealing cavity,thus in-hibiting the oil mist leakage.For the lower sealing cavity,increasing the inlet pressure and decreasing the inlet velocity is helpful to improve the sealing performance.The research of this paper can provide a reference for improving the oil tank sealing and the controlling measures of bearing oil mist leakage and enhancing the economic benefits and the safety and stability of operation of power stations.
pumped storage power stationbearing oil grooveoil mist leakagesealing structure optimizationMixture model
万方数据
维普
