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| Study on the influence of oil level change on oil mist leakage problem of generator thrust bearing oil tank |
| XU Lijun1, YANG Xiong1, HONG Yunlai1, NIE Sai1, ZHANG Zhiping1,SUN Jie2, ZHANG Yuquan3*, ZHENG Yuan3 |
| 1. Jiangxi Hongping Pumped Storage Co. LTD Jing′an, Yichun, Jiangxi 330603, 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 |
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Abstract A three-dimensional thrust bearing model was established to solve the oil mist leakage problem of thrust bearing in Jiangxi Hongping Pumping and Storage power Station. The VOF multiphase flow model, Lee evaporative condensation model, and RNG k-ε turbulence model were used to solve the lubricating oil-air-oil mist three-phase fluid-thermal coupling problem in the oil tank. The influence of the change of oil level height from low alarm level to high alarm level on the distribution characteristics of the flow field in the oil groove was analyzed, and the distribution of lubricating oil and the accumulation of oil mist under different oil levels were explored. Also, the generation and accumulation positions of oil mist were located. It is found that the unit speed and the external circulation pump performance mainly determine the oil tank velocity and temperature distribution. The oil mist mainly gathers in two areas after it is generated. One is the area between the oil baffle and the thrust head, and the other is the area at the oil pipe. These two regions are characterized by low pressure, high temperature, and high velocity and are most prone to external and internal oil dumping. In addition, with the high-speed increase in oil level, the oil pressure cascade gradually loses its oil mist suppression effect. The thrust bearing oil groove is not recommended to operate at a higher oil level for operation safety and environmental safety. This paper can provide a theoretical basis for reasonably setting the operating parameters of a thrust oil tank.
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Received: 29 October 2021
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