|
|
|
| Influence of sealing structure of generator bearing oil groove on oil mist leakage |
| LIU Lijun1, ZHANG Zhiping1, XU Qianxin1, ZHANG Songxiao1,WU Zhonghua1, SUN Jie2, ZHENG Yuan3, ZHANG Yuquan3* |
| 1. Jiangxi Hongping Pumped Storage Co., Ltd., Yichun, Jiangxi 330600, China; 2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China;3. College of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
|
|
|
|
Abstract 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 pollution caused by oil mist leakage inside the generator, this paper focuses on the problem of oil mist dumping in the generator bearing of a pumped storage power station. 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 improved 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 inhibiting 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.
|
|
Received: 24 March 2022
|
|
|
|
|
|
|
