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Investigations on Pressure Fluctuations in the S-Shaped Region of a Pump–Turbine

Author

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  • Hongjie Wang

    (State Key Laboratory of Hydro-Power Equipment, Harbin 150040, China
    Harbin Electric Machinery Company Limited, Harbin 150001, China
    Harbin Institute of Large Electrical Machinery, Harbin 150040, China
    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Jianpeng Wang

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Ruzhi Gong

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Chaoying Shang

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Deyou Li

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Xianzhu Wei

    (State Key Laboratory of Hydro-Power Equipment, Harbin 150040, China
    Harbin Electric Machinery Company Limited, Harbin 150001, China
    Harbin Institute of Large Electrical Machinery, Harbin 150040, China
    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

Abstract

Hydraulic pumped storage is a special power generation and electricity shortage technology, which is usually operated with thermal power and nuclear power units, and plays a key role in ultra-high voltage and smart grid. Pressure fluctuations are the main reasons for the instability of the S-shaped region of pump–turbines, which seriously affects their lifespan and operation stability. To reveal the mechanism and propagation law of pressure fluctuations in the S-shaped region as well as numerical simulations at the turbine, the braking and the reverse pump operating conditions of a pump–turbine were carried out. Numerical results were validated using the performance experiments, and the generation mechanism and propagation law of pressure fluctuation were analyzed in detail. The analyses show that high-amplitude pressure fluctuations mainly occur in the braking and reverse pump operating conditions. Under the braking condition, a 0.49- f n low-frequency pressure fluctuation was captured, which is caused by the rotation of the backflow in the vanes. Under the reverse pump condition, a 0.19- f n low-frequency pressure fluctuation was confirmed, which is caused by the periodic rotation of the vortex between the vaneless space. This study has important guiding significance for practical engineering application.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6683-:d:656831
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    References listed on IDEAS

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    1. Tahani, Mojtaba & Kandi, Ali & Moghimi, Mahdi & Houreh, Shahram Derakhshan, 2020. "Rotational speed variation assessment of centrifugal pump-as-turbine as an energy utilization device under water distribution network condition," Energy, Elsevier, vol. 213(C).
    2. 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.
    3. Rezghi, A. & Riasi, A., 2016. "Sensitivity analysis of transient flow of two parallel pump-turbines operating at runaway," Renewable Energy, Elsevier, vol. 86(C), pages 611-622.
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    1. Jinbao Chen & Yang Zheng & Lihong Zhang & Xiaoyu Chen & Dong Liu & Zhihuai Xiao, 2023. "Influence Analysis of Runner Inlet Diameter of Hydraulic Turbine in Turbine Mode with Ultra-Low Specific Speed," Energies, MDPI, vol. 16(20), pages 1-16, October.

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