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As the time goes by, the seal of the bearing oil tank cover of the hydropower station is gradually worn, the gap between dynamic and static increases, and the oil mist escapes seriously. In order to explore the influence of wear clearance and unit speed on oil mist leakage in oil tank seal, a geometric model of thrust bearing oil tank seal of generator was established. Using SST κ-ω turbulence model, steady state numerical simulation was carried out for oil mist leakage at different clearances (0.2 mm-2 mm) and rotating speeds (100 r/min-500 r/min). It is found that the influence of clearance value on oil mist leakage is much higher than that of rotational speed. With the increase of clearance, the throttling effect of sealing teeth is weakened, the sealing inlet pressure is reduced, and the oil mist leakage at the top of the tank cover is aggravated. The inlet and outlet velocity increases with the increase of wear clearance value. When the clearance value increases from 0.2 mm to 2 mm, the inlet velocity increases from 20 m/s to 113 m/s, the outlet speed increases from 76 m/s to 144 m/s, the leakage volume increases from 0.034 4 kg/s to 0.053 8 kg/s. The research can provide a theoretical basis for the optimization of sealing structure, the formulation of power station operation strategy, and the judgment of sealing performance.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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