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Journal of Drainage and Irrigation Machinery Engin  2013, Vol. 31 Issue (1): 7-10    DOI: doi:10.3969/j.issn.1674-8530.2013.01.002
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Pressure fluctuation characteristics of pumpturbine at pump mode
 WANG  Le-Qin, LIU  Ying-Yuan, LIU  Wan-Jiang, QIN  Da-Qing, JIAO  Lei

(1. Institute of Chemical Machinery, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2. Harbin Institute of Large Electrical Machinery, Harbin, Heilongjiang 150040, China)
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Abstract To study the hydraulic instability of a pumpturbine at the pump mode under different working conditions, the threedimensional, unsteady flow in the whole passage of the pumpturbine was conducted by using computational fluid dynamics softwareFluent under the optimal, low and high flow rate conditions. The pressure fluctuations were monitored respectively at the inlet of spiral casing, in the interface of runner and guide vanes, and in the space between head cover and runner, as well as in draft tube. The results show that a larger pressure fluctuation can be found in the interface of runner and guide vanes and in the space between the runner and head cover, while the pressure fluctuation is lower at the inlet of the spiral casing and in the draft tube. The pressure fluctuation is the smallest under the optimal condition; the larger the working condition deviates from the optimal one, the more considerable the fluctuation is. The dominant frequency of pressure fluctuation depends on the locations monitored. The dominant frequencies are integer multiples of the blade passing frequency and the runner rotational frequency in the interface of runner and guide vanes and in the space between runner and head cover, respectively. However, the dominant frequencies of the pressure fluctuation at the inlet of the spiral casing and in the draft tube are mainly related to lowfrequency components.
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Articles by authors
WANG Le-Qin
LIU Ying-Yuan
LIU Wan-Jiang
QIN Da-Qing
JIAO Lei
Key wordspump turbine   pump mode   pressure fluctuation   unsteady flow   frequency analysis     
Received: 2012-03-14; Published: 2013-01-31
Cite this article:   
WANG Le-Qin,LIU Ying-Yuan,LIU Wan-Jiang et al. Pressure fluctuation characteristics of pumpturbine at pump mode[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(1): 7-10.
 
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