关键词: 尾水管补气, 混流式水轮机, 水轮机出力, 龚嘴水电站

Abstract:

After the renovation of Gongzui Hydropower Station, there is a big problem of pressure fluctuation and noise when it runs at low load, so model test of air supply at main shaft's center hole was used to carry out the forced top cap air supply test for Unit 1, and the test result was verified by the real machine. The test result indicated that when compensating appropriate amount of air, the relative fluctuation amplitudes of mixing frequency and dominant frequency of pressure decrease significantly, which has a good effect on reducing the pressure pulsation and noise in partial load zone. This method has a certain reference value for tail water pipe air supply measures for other low head power station.
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Key words: air supply for tail water pipe, axial flow turbine, output of hydraulic turbine, Gongzui Hydropower Station