Abstract
The performance of a reversible pump turbine with S-shaped characteristics is of great importance to the transition processes such as start-up and load rejection. In order to predict the S-shaped curve accurately and develop a reliable tool for design improvement, a shear stress transport model (SST) with various numerical schemes for pressure term in the governing equation was investigated in a whole pump turbine including spiral casing, stay vanes, guide vanes, runner and draft tube. Through the computation, it was shown that different zones in the curve should employ different schemes to get the solution converged. Comparison of discharge-speed performance showed that good correspondence is got between experimental data and CFD results. Based on this, internal flow analysis was carried out at three typical operating points representing turbine mode, shut-off mode and reversible pump mode, respectively. According to the flow field concerned, the mechanism for the speed-no-load instability was explained, which provides good guidelines to take countermeasures in future design.
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References
Nicolet C, Alligne S, Kawkabani B. Stability Study of Francis Pump-Turbine at Runaway. Brno: IAHR, 2009
Nicolet C, Avellan F, Allenbach P, et al. New Tool for the Simulation of Transientphenomena in Francis Turbine Power Plants. Lausanne: IAHR, 2002
Zhang J, Hu J, Hu M, et al. Study on the Reversible Pump-Turbine Closing Law and Field Test. Miami: American Society of Mechanical Engineers, 2006
Xu L. Investigation on Internal Flow Visualization and Image Processing Method in Pump Turbine. Dissertation of Doctoral Degree. Zhengzhou: North China University of Water Resources and Electric Power, 2002
Hasmatuchi V, Farhat M, Maruzewski P, et al. Experimental Investigation of a Pump-Turbine at Off-Design Operation Conditions. Brno: IAHR, 2009
Pettersen K, Nielsen T K, Billdal J T. An explanation to the steep speed-flow characteristics of rpts. Stockholm: IAHR, 2004
Tani K, Okumura H. Performance improvement of pump-turbine for large capacity pumped storage plant in UAS. Hitachi Rev, 2009, 58: 198–202
Wu Y L, Shao Q, Liu S H. Three-dimensional simulation of unsteady flow in a model Francis hydraulic turbine. Tsinghua Sci Tech, 2004, 9: 694–699
Backman G. Cfd Validation of Pressure Fluctuations in a Pump Turbine. Dissertation of Doctoral Degree. Lulea: Lulea University of Technology, 2008
Keck H, Michler W, Weiss T. Recent Developments in the Dynamic Analysis of Water Turbines. Timisoara: IAHR, 2007
Bjarne J B, Sverre K D. Numerical Computation of the Pump Turbine Characteristics. Lausanne: IAHR, 2002
Cummings R M, Forsythe J R, Morton S A, et al. Computational challenges in high angle of attack flow prediction. Progress in Aerospace Sciences. 2003(39): 369–384.
Menter F R, Kuntz M, Langtry R. Ten years of industrial experience with the sst turbulence model. Turbul, Heat Mass Transfer, 2003, 4: 1–8
http://iceberg1.shef.ac.uk/docs/fluentdoc/html/ug/main_pre.htm, 2004
Nicolet C. Unstable Operation of Francis Pump Turbine at Runway: Rigid and Elastic Water Column Oscilation Modes. Iguassu: IAHR, 2008
Nicolet C, Alligné S, Kawkabani B. Unstable Operation of Francis Pump-Turbine at Runaway: Rigid and Elastic Water Column Oscilation Modes. Fozdoiguassu: IAHR, 2008
Arpad F A. Does Rotating Stall Occur in Francis Runners Causing Fluctuations? Brno: IAHR, 2009
Emmons H W, Kronauer R E, Rockett J A. A survey of stall propagation-Experiment and theory. ASME J Basic Eng, 1959, 81: 409–416
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Wang, L., Yin, J., Jiao, L. et al. Numerical investigation on the “S” characteristics of a reduced pump turbine model. Sci. China Technol. Sci. 54, 1259–1266 (2011). https://doi.org/10.1007/s11431-011-4295-2
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DOI: https://doi.org/10.1007/s11431-011-4295-2