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Journal of Drainage and Irrigation Machinery Engin  2013, Vol. 31 Issue (4): 309-312    DOI: 10.3969/j.issn.1674-8530.2013.04.007
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Aeration valve improvement of Liziping hydropower plant Francis turbine
 ZHOU  Tao, ZHANG  Hai-Ku, ZHU  Xiao-Min, LIU  Xiao-Bing, LIU  De-Min, DENG  Ming-Gui
(1.Guodian Sichuan Liziping Electric Power Co.,Ltd.,Yaan, Sichuan 625400, China; 2.Commissioning and Test Institute of Sichuan Electric Power Industry, Chengdu, Sichuan 610072, China; 3.School of Energy and Environment, Xihua University, Chengdu, Sichuan 610039, China; 4.Dongfang Electric Corporation, Chengdu, Sichuan 611731, China)
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Abstract For Francis turbine, reasonable aeration can weaken vibration and cavitation effectively. The high head turbine of Liziping hydropower plant originally uses holes at turbine bearing flange root to aerate, and which can not have expected function for the whirl area and causes significant vibration. A project of setting cross aeration valve in draft tube is proposed. To prevent the device from falling off and reduce flow resistance and lower whirl whip reaction, the streamline shaped cross aeration was made of highquality stainless steel and had compensating holes placed in the center and back of it. According to the comparison of the vibrations, pressure fluctuations and air admission test before and after the modification, the results show that it can exactly and automatically supply air to the strong vibration region, effectively eliminate pressure fluctuation caused by draft tube whirl whip, the vibration of bearing, brackets and cover are reduced to different degrees respectively, and the draft tube cone swing completely solved. It works well for the stability of hydroelectricity generating units. For other small and mediumsized hydroturbine plants, the aerating device design is referentially valuable.
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ZHOU Tao
ZHANG Hai-Ku
ZHU Xiao-Min
LIU Xiao-Bing
LIU De-Min
DENG Ming-Gui
Key wordshydraulic turbine   aeration valve   improvement   vibration   pressure fluctuation     
Received: 2012-10-22; Published: 2013-04-30
Cite this article:   
ZHOU Tao,ZHANG Hai-Ku,ZHU Xiao-Min et al. Aeration valve improvement of Liziping hydropower plant Francis turbine[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(4): 309-312.
 
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