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A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine Unit

Author

Listed:
  • Jun-Won Suh

    (Clean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, Korea)

  • Seung-Jun Kim

    (Clean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, Korea)

  • Hyeon-Mo Yang

    (Clean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, Korea)

  • Moo-Sung Kim

    (Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea)

  • Won-Gu Joo

    (Department of Mechanical Engineering, Yonsei University, Seoul 03722, Korea)

  • Jungwan Park

    (Hydropower Design & Technology Group, Korea Hydro & Nuclear Power Co., Ltd., Daejeon 34101, Korea)

  • Jin-Hyuk Kim

    (Clean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, Korea
    Industrial Technology (Green Processes and Energy System Engineering), University of Science and Technology, Daejeon 34141, Korea)

  • Young-Seok Choi

    (Clean Energy R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, Korea
    Industrial Technology (Green Processes and Energy System Engineering), University of Science and Technology, Daejeon 34141, Korea)

Abstract

S-shaped characteristics in turbine mode are prone to instabilities in associated transient processes. A single value of the speed factor corresponds to multiple values of the discharge factor, having the possibility of changing the operating point among the turbine, turbine brake, and reverse pump modes. Because of this characteristic, the S-shaped curves induce instability in transient processes. Understanding the hydraulic behavior of a turbine on the four-quadrant characteristic is important since it provides detailed performance information through the whole discharge range of the turbine. This study was numerically and experimentally investigated the scale effect on the S-shaped characteristics in the turbine transition region. The four-quadrant characteristic curves (full- and laboratory-scale) in the turbine mode were predicted by numerical simulations. To verify the predicted results, a laboratory-scale experiment was performed in the turbine, turbine brake, and reverse pump modes. Although the full-scale experiment was performed in the normal operating head range, the scale effect can be validated by comparing steady operating points between the two models. Based on the verified results, the internal flow and pressure pulsation characteristics were determined at the operating point in a specific transition region.

Suggested Citation

  • Jun-Won Suh & Seung-Jun Kim & Hyeon-Mo Yang & Moo-Sung Kim & Won-Gu Joo & Jungwan Park & Jin-Hyuk Kim & Young-Seok Choi, 2021. "A Comparative Study of the Scale Effect on the S-Shaped Characteristics of a Pump-Turbine Unit," Energies, MDPI, vol. 14(3), pages 1-29, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:525-:d:483516
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    References listed on IDEAS

    as
    1. Suh, Jun-Won & Kim, Seung-Jun & Kim, Jin-Hyuk & Joo, Won-Gu & Park, Jungwan & Choi, Young-Seok, 2020. "Effect of interface condition on the hydraulic characteristics of a pump-turbine at various guide vane opening conditions in pump mode," Renewable Energy, Elsevier, vol. 154(C), pages 986-1004.
    2. Cavazzini, Giovanna & Houdeline, Jean-Bernard & Pavesi, Giorgio & Teller, Olivier & Ardizzon, Guido, 2018. "Unstable behaviour of pump-turbines and its effects on power regulation capacity of pumped-hydro energy storage plants," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 399-409.
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    4. Valentín, David & Presas, Alexandre & Valero, Carme & Egusquiza, Mònica & Egusquiza, Eduard & Gomes, Joao & Avellan, François, 2020. "Transposition of the mechanical behavior from model to prototype of Francis turbines," Renewable Energy, Elsevier, vol. 152(C), pages 1011-1023.
    5. Zhiyan Yang & Zirui Liu & Yongguang Cheng & Xiaoxi Zhang & Ke Liu & Linsheng Xia, 2020. "Differences of Flow Patterns and Pressure Pulsations in Four Prototype Pump-Turbines during Runaway Transient Processes," Energies, MDPI, vol. 13(20), pages 1-20, October.
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    Cited by:

    1. Kim, Seung-Jun & Yang, Hyeon-Mo & Park, Jungwan & Kim, Jin-Hyuk, 2022. "Investigation of internal flow characteristics by a Thoma number in the turbine mode of a Pump–Turbine model under high flow rate," Renewable Energy, Elsevier, vol. 199(C), pages 445-461.
    2. Hongjie Wang & Jianpeng Wang & Ruzhi Gong & Chaoying Shang & Deyou Li & Xianzhu Wei, 2021. "Investigations on Pressure Fluctuations in the S-Shaped Region of a Pump–Turbine," Energies, MDPI, vol. 14(20), pages 1-19, October.
    3. Kim, Seung-Jun & Suh, Jun-Won & Yang, Hyeon-Mo & Park, Jungwan & Kim, Jin-Hyuk, 2022. "Internal flow phenomena of a Pump–Turbine model in turbine mode with different Thoma numbers," Renewable Energy, Elsevier, vol. 184(C), pages 510-525.

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