Hydrodynamic Characterization of Small-Size Kaplan Turbine
Publication: Journal of Hydraulic Engineering
Volume 147, Issue 2
Abstract
This paper reports the results of simulating the steady and cavitating flows through a low-head small-size Kaplan turbine. The computed hydraulic performance depicts a moderate efficiency of this Kaplan turbine owing to the high specific speed and the large gap between blades and shroud. The effects of blade setting angle, vane opening, discharge, and rotational speed on the hydraulic performance are discussed. The formation of cavities in the runner blades occurs at certain operating conditions and the cavities typically appear over the fore of blade suction side and the blade tip. In addition, the criteria of cavitation inception are revealed. These results provide useful information how to improve the design of this category of Kaplan turbines.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
References
ANSYS-CFX. 2015. ANSYS CFX-solver theory guide: Release 16.0. Canonsburg, PA: ANSYS.
Avellan, F. 2004. “Introduction to cavitation in hydraulic machinery.” In Proc., 6th Int. Conf. on Hydraulic Machinery and Hydrodynamics. Timisoara, Romania: Politehnica Univ. of Timisoara.
Cammenga, H. K. 1980. “Evaporation mechanisms of liquids.” In Vol. 5 of Current topics in materials science, edited by E. Kaldis, 335. Amsterdam: North-Holland.
ESHA (European Small Hydropower Association). 2004. “Guide on how to develop a small hydro power plant.” In Guideline book, edited by C. Penche. Brussels, Belgium: ESHA.
Ghenaiet, A., and M. Bakour. 2020. “Simulation of steady and unsteady flows through a small-size Kaplan turbine.” Eng. Rep. 2 (2): e12112. https://doi.org/10.1002/eng2.12112.
Jošt, D., M. Morgut, A. Škerlavaj, and E. Nobile. 2015. “Cavitation prediction in a Kaplan turbine using standard and optimized model parameters.” In Proc., 6th IAHR Int. Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems. Novo Mesto: Faculty of Technologies and System.
Kaniecki, M., Z. Krzemianowski, and M. Banaszek. 2011. “Computational fluid dynamics simulations of small capacity Kaplan turbines.” Trans. Inst. Fluid-Flow Mach. 123: 71–84.
Liu, S., Q. Chen, and Y. Wu. 2007. “Unsteady cavitating turbulent flow simulation in a Kaplan turbine.” In Proc., 2nd IAHR Int. Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems. Timisoara, Romania: Univ. of Timisoara.
Luo, X. W., B. Ji, and Y. Tsujimoto. 2016. “A review of cavitation in hydraulic machinery.” J. Hydrodyn. 28 (3): 335–358. https://doi.org/10.1016/S1001-6058(16)60638-8.
Menter, F. R. 1994. “Two-equation eddy-viscosity turbulence models for engineering applications.” AIAA J. 32 (8): 1598–1605. https://doi.org/10.2514/3.12149.
Mulu, B. G., M. J. Cervantes, C. Devals, T. C. Vu, and F. Guibault. 2015. “Simulation-based investigation of unsteady flow in near-hub region of a Kaplan turbine with experimental comparison.” Eng. Appl. Comput. Fluid Mech. 9 (1): 139–156. https://doi.org/10.1080/19942060.2015.1004816.
Nilsson, H., and L. Davidson. 2000. “A numerical comparison of four operating conditions in a Kaplan water turbine, focusing on tip clearance flow.” In Proc., 20th IAHR Symp. Charlotte, NC: International Association for Hydro-Environment Engineering and Research.
Nilsson, H., and L. Davidson. 2003. “Validations of CFD against detailed velocity and pressure measurements in water turbine runner flow.” Int. J. Numer. Methods Fluids 41 (8): 863–879. https://doi.org/10.1002/fld.472.
Okita, K., and T. Kajishima. 2002. “Numerical simulation of unsteady cavitating flow around a hydrofoil.” Trans. JSME B 68 (667): 637–644. https://doi.org/10.1299/kikaib.68.637.
Park, J. Y., M. S. Choi, and J. H. Baek. 2003. “Effects of axial clearance on unsteady secondary flow in one-stage axial turbine.” Int. J. Turbo Jet Engines 20 (4): 315–334. https://doi.org/10.1515/TJJ.2003.20.4.315.
Rodi, W. 2017. “Turbulence modeling and simulation in hydraulics: A historical review.” J. Hydraul. Eng. 143 (5): 03117001. https://doi.org/10.1061/(ASCE)HY.1943-7900.0001288.
Singhal, A. K., M. M. Athavale, H. Y. Li, and Y. Jiang. 2002. “Mathematical basis and validation of the full cavitation model.” J. Fluids Eng. 124 (3): 617–624. https://doi.org/10.1115/1.1486223.
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© 2020 American Society of Civil Engineers.
History
Received: Jun 7, 2019
Accepted: Sep 3, 2020
Published online: Dec 15, 2020
Published in print: Feb 1, 2021
Discussion open until: May 15, 2021
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