排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2013, Vol. 31 Issue (2): 128-131    DOI: 10.3969/j.issn.1674-8530.2013.02.008
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Optimization of misaligned guide vanes scheme of pumpturbine
 XIAO  Ruo-Fu, SUN  Hui, YANG  Wei, LIU  Wei-Chao, WANG  Fu-Jun
(1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2.Dongfang Electric
 Machinery Co. Ltd., Deyang, Sichuan 618000, China)
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Abstract  Pumpturbine operation along the Sshaped curve may encounter difficulties in loading rejection process or unusual increases of water pressure resulted in violent machine vibrations. The prevailing and effective solution to this problem is misaligned guide vanes (MGV) technique, that is, to control the stability of the machine operation in the S region by preopening several guide vanes (usually an even number) to specified angles. In order to explore the feasible and effective way of preopening guide vanes, firstly, based on the numbers and the locations of MGVs, four MGVs were designed, in the hope of finding the most optimal solution to eliminate S characteristics through fully threedimensional numerical simulation of flow analysis; secondly, model tests for the selected most optimal program were performed and the experimental results and simulation results were compared. The analysis of the results of the four preopening programs shows that  more number of preopening guide vanes does not necessarily mean better improvement of S characteristics and equallydistributed guide vanes is better than centrallydistributed ones in improving S characteristics. It is concluded that the program of preopening 2#,7#,12#,17# twopair guide vanes can most effectively mitigate the S characteristics of pumpturbine; CFD calculations and the comparison with model test show that CFD simulation is well consistent with experimental data.
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Articles by authors
XIAO Ruo-Fu
SUN Hui
YANG Wei
LIU Wei-Chao
WANG Fu-Jun
Key wordspumpturbine   Sshaped characteristics   misaligned guide vanes   numerical simulation   model test     
Received: 2012-05-17; Published: 2013-02-28
Cite this article:   
XIAO Ruo-Fu,SUN Hui,YANG Wei et al. Optimization of misaligned guide vanes scheme of pumpturbine[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(2): 128-131.
 
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