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Journal of Drainage and Irrigation Machinery Engin  2013, Vol. 31 Issue (5): 401-405    DOI: 10.3969/j.issn.1674-8530.2013.05.007
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Numerical analysis of flow in pumpturbine operating in Sshape region
(1. College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China; 2. Turbine Laboratory,State Key Laboratory of Hydropower Equipment, Harbin,Heilongjiang 150040, China)
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Abstract In order to study the characteristics of internal flow in a pumpturbine operating in the Sshape region, the flow in the model pumpturbine in a pumped storage power station in China was simulated by using CFD codeCFX. The detached eddy simulation model (DES) that is more precise than the traditional RANS model was applied in the simulation, consequently, the internal flow pattern and performance parameters of the pumpturbine were obtained; and compared with the experimental data and the theoretical analysis results, respectively. It was shown that the results of DES model are quite good, causing the error between the estimated and experimental performance is less than 3%; further, the internal flow in the runner are in good agreement with theoretical analysis as well. As the flow rate decreases, the flow separation phenomenon near the runner inlet was strengthened gradually, and eventually a vortex was developed in the flow passages, causing a blockage to flow. Note that the vortex can induce rotorstator interactions among the runner and double circular cascade, which will results in instability of flow in the whole passage.
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Articles by authors
LI Ren-Nian
LIU Dian-Xing
DONG Zhi-Qiang
WEI Xian-Zhu
Key wordspump turbine   Sshaped region   numerical simulation   DES model   flow characteristics     
Received: 2012-09-18; Published: 2013-05-31
Cite this article:   
LI Ren-Nian,LIU Dian-Xing,DONG Zhi-Qiang et al. Numerical analysis of flow in pumpturbine operating in Sshape region[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(5): 401-405.
 
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