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Oscillation of Cavitating Vortices in Draft Tubes of a Simplified Model Turbine and a Model Pump–Turbine

Author

Listed:
  • Sergey Skripkin

    (Laboratory of Advanced Energy Efficient Technologies, Physics Department, Novosibirsk State University, Novosibirsk 630090, Russia)

  • Zhigang Zuo

    (State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
    State Key Laboratory of Hydro Science and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Mikhail Tsoy

    (Laboratory of Advanced Energy Efficient Technologies, Physics Department, Novosibirsk State University, Novosibirsk 630090, Russia)

  • Pavel Kuibin

    (Laboratory of Advanced Energy Efficient Technologies, Physics Department, Novosibirsk State University, Novosibirsk 630090, Russia)

  • Shuhong Liu

    (State Key Laboratory of Hydro Science and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

Abstract

The self-oscillation of the cavitating vortices is one of the dangerous phenomena of hydraulic turbine operation near full-load conditions. This work is an attempt to generalize data and expand insight on the phenomenon of self-excited oscillations by comparing the experimental results obtained on a simplified turbine and scaled-down pump–turbine models. In both cases, a series of high-speed imaging was carried out, which made it possible to study these phenomena with high temporal resolution. The high-speed imaging data was subjected to additional processing such as binarization, cropping, and scaling. For a simplified turbine model, the volume of the vapor cavity was calculated based on the assumption of the axial symmetry of the cavity, after which fast Fourier transform (FFT) analysis was carried out. A proper orthogonal decomposition (POD) analysis was also performed to examine individual modes in the original digital imaging data. For the pump–turbine, visualization data on the cavitation cavity oscillations were supplemented by pressure measurements in the draft tube cone to determine the frequency characteristics. Based on obtained experimental data, an improved one-dimensional model describing the oscillations of the cavitation cavity arising behind the hydraulic turbine runner is proposed.

Suggested Citation

  • Sergey Skripkin & Zhigang Zuo & Mikhail Tsoy & Pavel Kuibin & Shuhong Liu, 2022. "Oscillation of Cavitating Vortices in Draft Tubes of a Simplified Model Turbine and a Model Pump–Turbine," Energies, MDPI, vol. 15(8), pages 1-18, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:8:p:2965-:d:796534
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    References listed on IDEAS

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    1. Ondřej Urban & Michaela Kurková & Pavel Rudolf, 2021. "Application of Computer Graphics Flow Visualization Methods in Vortex Rope Investigations," Energies, MDPI, vol. 14(3), pages 1-21, January.
    2. Li, Deyou & Chang, Hong & Zuo, Zhigang & Wang, Hongjie & Li, Zhenggui & Wei, Xianzhu, 2020. "Experimental investigation of hysteresis on pump performance characteristics of a model pump-turbine with different guide vane openings," Renewable Energy, Elsevier, vol. 149(C), pages 652-663.
    3. David Valentín & Alexandre Presas & Eduard Egusquiza & Carme Valero & Mònica Egusquiza & Matias Bossio, 2017. "Power Swing Generated in Francis Turbines by Part Load and Overload Instabilities," Energies, MDPI, vol. 10(12), pages 1-17, December.
    4. Lu, Guocheng & Zuo, Zhigang & Sun, Yuekun & Liu, Demin & Tsujimoto, Yoshinobu & Liu, Shuhong, 2017. "Experimental evidence of cavitation influences on the positive slope on the pump performance curve of a low specific speed model pump-turbine," Renewable Energy, Elsevier, vol. 113(C), pages 1539-1550.
    5. Raul-Alexandru Szakal & Alexandru Doman & Sebastian Muntean, 2021. "Influence of the Reshaped Elbow on the Unsteady Pressure Field in a Simplified Geometry of the Draft Tube," Energies, MDPI, vol. 14(5), pages 1-21, March.
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    Cited by:

    1. Sergey Shtork & Daniil Suslov & Sergey Skripkin & Ivan Litvinov & Evgeny Gorelikov, 2023. "An Overview of Active Control Techniques for Vortex Rope Mitigation in Hydraulic Turbines," Energies, MDPI, vol. 16(13), pages 1-31, July.
    2. Sergey Skripkin & Daniil Suslov & Ivan Plokhikh & Mikhail Tsoy & Evgeny Gorelikov & Ivan Litvinov, 2023. "Data-Driven Prediction of Unsteady Vortex Phenomena in a Conical Diffuser," Energies, MDPI, vol. 16(5), pages 1-20, February.

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