Numerical Optimization of a Centrifugal Pump Impeller with Splitter Blades Running in Reverse Mode

Ioannis Kassanos; Marios Chrysovergis; John Anagnostopoulos; George Charalampopoulos; Stamelos Rokas; Stavros Lekanidis; Ioannis Kontominas; Dimitris Papantonis

doi:10.15866/ireme.v10i4.8375

Numerical Optimization of a Centrifugal Pump Impeller with Splitter Blades Running in Reverse Mode

Ioannis Kassanos^(1*), Marios Chrysovergis⁽²⁾, John Anagnostopoulos⁽³⁾, George Charalampopoulos⁽⁴⁾, Stamelos Rokas⁽⁵⁾, Stavros Lekanidis⁽⁶⁾, Ioannis Kontominas⁽⁷⁾, Dimitris Papantonis⁽⁸⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/ireme.v10i4.8375

Abstract

In this paper the numerical modeling and optimization of a centrifugal pump impeller running in reverse operation is presented. The turbine operating point was determined using empirical correlations, which were also validated by the numerical performance curves obtained from multiple operating point simulations. This information is used to validate the numerical approach and assumptions in order to be used in the optimization of the impeller in turbine operation. Subsequently, a parametric study is performed comparing the relative effect in performance of various design modifications, such as the inlet edge shape, the meridional channel width, the number of vanes, and the effect of splitter blades. Using the previous results as guidelines, the numerical optimization of the runner is performed using two optimization algorithms. In the first, only the blade shape was allowed to change while the meridional contour of the runner was maintained constant in order to accommodate the available spiral casing dimensions. In the second optimization, the runner diameter was also included. From the results of the optimization, an overall increase in turbine efficiency of approximately 2.7% could be achieved.
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Keywords

Hydropower; Pump as Turbine; Impeller Design; Numerical Modeling; Optimization

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References

A. Williams, “The turbine performance of centrifugal pumps: a comparison of prediction methods”, Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 1994, pp. 59-66.
http://dx.doi.org/10.1243/pime_proc_1994_208_009_02

A. Willimas, Pumps as turbines for low cost micro hydro power, Renewable Energy, Vol. 9, pp. 1227-1234, 1996.
http://dx.doi.org/10.1016/0960-1481(96)88498-9

M. Arriaga, Pump as turbine - A pico hydro alternative in Lao Peoples’s Democratic Republic, Renewable Energy, Vol. 35, pp. 1109-1115, 2010
http://dx.doi.org/10.1016/j.renene.2009.08.022

S. Jain, A. Swankar, K. Motwani, R. Patel, Effects of impeller diameter and rotational speed on performance of pump running in turbine mode, Energy Conversion and Management, Vol. 89, pp. 808-824, 2015.
http://dx.doi.org/10.1016/j.enconman.2014.10.036

S. Yang, S. Derakhshan, F. Kong, Theoretical, numerical and experimental prediction of pump as turbine performance, Renewable energy, Vol. 48, pp. 507-513, 2012.
http://dx.doi.org/10.1016/j.renene.2012.06.002

S. Yang, F. Kong, W. Jiang, X. Qu, Effects of impeller trimming influencing pump as turbine, Computers & Fluids,Vol. 67, pp. 72-78, 2012.
http://dx.doi.org/10.1016/j.compfluid.2012.07.009

D. Giosio, A. Henderson, J. Walker, P. Brandner, J. Sargison, P. Gautam, Design and performance evaluation of a pump-as-turbine micro hydro test facility with incorporated inlet flow control, Renewable Energy, Vol. 78, pp. 1-6, 2015.
http://dx.doi.org/10.1016/j.renene.2014.12.027

M. Golcu, Yasar Pancar, Y. Sekmen, Energy saving in a deep well pump with splitter blade, Energy conversion and Management, Vol. 47, pp. 638-651, 2006.
http://dx.doi.org/10.1016/j.enconman.2005.05.001

Hou Y. Research on the length ratio of splitter blades for Ultra High Head Francis runners, Procedia Engineering ,Vol. 31, pp. 92-96, 2012.
http://dx.doi.org/10.1016/j.proeng.2012.01.996

L Meng, S P Zhang, L J Zhou, Z W Wang. Study on the Pressure Pulsation inside Runner with Splitter Blades in Ultra-High Head Turbine, Proc. of the 27th IAHR Symposium on Hydraulic machinery and systems, Montreal, 2014
http://dx.doi.org/10.1088/1755-1315/22/3/032012

O. Antonsen, T. Nielsen, O. Dahlhaug, J T Billdal. Pressure Pulses in Francis Turbines vs. Guide Vane Design. Proc of the 23th IAHR Symposium on Hydraulic machinery and systems, Yokohama, 2006.

Y L Zhang, S Q Yuan, J F Zhabg, Y N Feng, J X Lu, Numerical investigation of the effects of splitter blades on the cavitation performance of a centrifugal pump, Proc. of the 27th IAHR Symposium on Hydrulic machinery and systems, Montreal, 2014.

S C Li. Cavitation of Hydraulic Machinery (Imperial College Press, 2000).
http://dx.doi.org/10.1142/p219

S. Miyauchi, B. Zhu, X. Luo, B. Piao, H. Matsumato, M. Sano, N. Kassai, Optimization and Inverse Design of Pump Impeller, 26th IAHR Symposium on Hydraulic Macinery and Systems, Beijing, 2012

B. Zhu, X.Whang, L. Tan, D. Zhou, Y. Zhao, S. Cao, Optimization design of a reversible pump-turbine runner with high efficiency and stability, Renewable energy, Vol. 81, pp. 366-376, 2015
http://dx.doi.org/10.1016/j.renene.2015.03.050

W.C. Schleicher, A. Oztekin, Hydraulic design and optimization of a modular pump-turbine runner, Energy Conversion and Management, Vol. 93, pp. 388-398, 2015
http://dx.doi.org/10.1016/j.enconman.2015.01.037

ANSYS, Inc. ANSYS FLUENT Solver Theory Guide, Release 15. 2013 [online] Available at: https://support.ansys.com/portal/site/AnsysCustomerPortal/template.fss?file=%2Fprod_docu%2F15.0%2FANSYS+Fluent+Users+Guide.pdf

Giannakoglou, K.C., Design of optimal aerodynamic shapes using stochastic optimization methods and computational intelligence, Progress in Aerospace Science, Vol. 38, pp. 43-76,2002.
http://dx.doi.org/10.1016/s0376-0421(01)00019-7

ANSYS, Inc. Design Exploration User’s Guide, Release 15. 2013 [online] Available at: https://support.ansys.com/portal/site/AnsysCustomerPortal/template.fss?file=%2Fprod_docu%2F15.0%2FDesign+Exploration+Users+Guide.pdf

Singh, R., Nataraj, M., Surendar, S., Siva, M., Investigation of a Centrifugal Pump Impeller Vane Profile Using CFD, (2013) International Review on Modelling and Simulations (IREMOS), 6 (4), pp. 1327-1333.

Mentzos, M., Markopoulos, A., Galanis, N., Margaris, D., Manolakos, D., Design, Numerical Analysis and Manufacture of Radial Pump Impellers with Various Blade Geometries, (2015) International Review of Mechanical Engineering (IREME), 9 (1), pp. 104-111.
http://dx.doi.org/10.15866/ireme.v9i1.4833

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