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On the Rotating Vortex Rope and Its Induced Structural Response in a Kaplan Turbine Model

Author

Listed:
  • Rafel Roig

    (Barcelona Fluids & Energy Lab, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain)

  • Xavier Sánchez-Botello

    (Barcelona Fluids & Energy Lab, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain)

  • Xavier Escaler

    (Barcelona Fluids & Energy Lab, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain)

  • Berhanu Mulu

    (Vattenfall AB, R&D, 814 70 Älvkarleby, Sweden)

  • Carl-Maikel Högström

    (Vattenfall AB, R&D, 814 70 Älvkarleby, Sweden)

Abstract

The rotating vortex rope, which can be decomposed in the rotating and the plunging modes, is the origin of pressure fluctuations in the draft tube cone when hydraulic turbines operate at part load, compromising the structural integrity and limiting the output load. A measurement campaign was carried out in a Kaplan turbine model which is a replica of the experimental 10 MW Porjus U9 prototype machine along a propeller curve to study the rotating vortex rope’s excitation levels and the induced structural responses. A complete set of sensors mounted on-board and off-board was used to measure pressures, forces, torques, accelerations, displacements, and strains. The characteristic frequencies and amplitudes of the pressure fluctuations and of the corresponding induced loads and vibrations associated with the two modes were quantified in a wide range of operating conditions at part load. The two modes are detected at different frequencies depending on the sensor position. Moreover, their frequencies change depending on the discharge and present different amplitudes depending on the mode. Particularly, the rotating mode shows higher amplitudes than the plunging mode in the majority of positions and directions measured.

Suggested Citation

  • Rafel Roig & Xavier Sánchez-Botello & Xavier Escaler & Berhanu Mulu & Carl-Maikel Högström, 2022. "On the Rotating Vortex Rope and Its Induced Structural Response in a Kaplan Turbine Model," Energies, MDPI, vol. 15(17), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6311-:d:901147
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    References listed on IDEAS

    as
    1. Liu, Xin & Luo, Yongyao & Wang, Zhengwei, 2016. "A review on fatigue damage mechanism in hydro turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1-14.
    2. Goyal, Rahul & Gandhi, B.K. & Cervantes, Michel J., 2018. "PIV measurements in Francis turbine – A review and application to transient operations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P2), pages 2976-2991.
    3. Presas, Alexandre & Luo, Yongyao & Wang, Zhengwei & Guo, Bao, 2019. "Fatigue life estimation of Francis turbines based on experimental strain measurements: Review of the actual data and future trends," Renewable and Sustainable Energy Reviews, Elsevier, vol. 102(C), pages 96-110.
    4. Sotoudeh, Nahale & Maddahian, Reza & Cervantes, Michel J., 2020. "Investigation of Rotating Vortex Rope formation during load variation in a Francis turbine draft tube," Renewable Energy, Elsevier, vol. 151(C), pages 238-254.
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