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Numerical Simulation of the Flow in a Kaplan Turbine Model during Transient Operation from the Best Efficiency Point to Part Load

Author

Listed:
  • Raluca G. Iovănel

    (Division of Fluid and Experimental Mechanics, Luleå University of Technology, 971 87 Luleå, Sweden)

  • Georgiana Dunca

    (Department of Hydraulics, Hydraulic Equipment and Environmental Engineering, Politehnica University of Bucharest, 060042 Bucharest, Romania)

  • Diana M. Bucur

    (Department of Hydraulics, Hydraulic Equipment and Environmental Engineering, Politehnica University of Bucharest, 060042 Bucharest, Romania)

  • Michel J. Cervantes

    (Division of Fluid and Experimental Mechanics, Luleå University of Technology, 971 87 Luleå, Sweden)

Abstract

The aim of this study is to develop a reliable numerical model that provides additional information to experimental measurements and contributes to a better exploitation of hydraulic turbines during transient operation. The paper presents a numerical analysis of the flow inside a Kaplan turbine model operated at a fixed runner blade angle during load variation from the best efficiency point (BEP) to part load (PL) operation. A mesh displacement is defined in order to model the closure of the guide vanes. Two different types of inlet boundary conditions are tested for the transient numerical simulations: linear flow rate variation (InletFlow) and constant total pressure (InletTotalPressure). A time step analysis is performed and the influence of the time discretization over the fluctuating quantities is discussed. Velocity measurements at the corresponding operating points are available to validate the simulation. Spectrogram plots of the pressure signals show the times of appearance of the plunging and rotating modes of the rotating vortex rope (RVR) and the stagnation region developed around the centerline of the draft tube is captured.

Suggested Citation

  • Raluca G. Iovănel & Georgiana Dunca & Diana M. Bucur & Michel J. Cervantes, 2020. "Numerical Simulation of the Flow in a Kaplan Turbine Model during Transient Operation from the Best Efficiency Point to Part Load," Energies, MDPI, vol. 13(12), pages 1-21, June.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3129-:d:372412
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    References listed on IDEAS

    as
    1. Mulu, B.G. & Jonsson, P.P. & Cervantes, M.J., 2012. "Experimental investigation of a Kaplan draft tube – Part I: Best efficiency point," Applied Energy, Elsevier, vol. 93(C), pages 695-706.
    2. Chirag Trivedi & Michel J. Cervantes & Ole G. Dahlhaug, 2016. "Experimental and Numerical Studies of a High-Head Francis Turbine: A Review of the Francis-99 Test Case," Energies, MDPI, vol. 9(2), pages 1-24, January.
    3. Banshwar, Anuj & Sharma, Naveen Kumar & Sood, Yog Raj & Shrivastava, Rajnish, 2017. "Market based procurement of energy and ancillary services from Renewable Energy Sources in deregulated environment," Renewable Energy, Elsevier, vol. 101(C), pages 1390-1400.
    4. Židonis, Audrius & Aggidis, George A., 2015. "State of the art in numerical modelling of Pelton turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 45(C), pages 135-144.
    5. Jonsson, P.P. & Mulu, B.G. & Cervantes, M.J., 2012. "Experimental investigation of a Kaplan draft tube – Part II: Off-design conditions," Applied Energy, Elsevier, vol. 94(C), pages 71-83.
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    Citations

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    Cited by:

    1. Raluca Gabriela Iovănel & Arash Soltani Dehkharqani & Diana Maria Bucur & Michel Jose Cervantes, 2022. "Numerical Simulation and Experimental Validation of a Kaplan Prototype Turbine Operating on a Cam Curve," Energies, MDPI, vol. 15(11), pages 1-24, June.
    2. Raluca Gabriela Iovănel & Arash Soltani Dehkharqani & Michel Jose Cervantes, 2022. "Numerical Simulation of a Kaplan Prototype during Speed-No-Load Operation," Energies, MDPI, vol. 15(14), pages 1-18, July.

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