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Hysteresis Characteristic in the Hump Region of a Pump-Turbine Model

Author

Listed:
  • Deyou Li

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
    Waterpower Laboratory, Norwegian University of Science and Technology, Trondheim 7491, Norway)

  • Hongjie Wang

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

  • Jinxia Chen

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

  • Torbjørn K. Nielsen

    (Waterpower Laboratory, Norwegian University of Science and Technology, Trondheim 7491, Norway)

  • Daqing Qin

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

  • Xianzhu Wei

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

Abstract

The hump feature is one of the major instabilities in pump-turbines. When pump-turbines operate in the hump region, strong noise and serious fluctuations can be observed, which are harmful to their safe and stable operation and can even destroy the whole unit as well as water conveyance system. In this paper, a low specific speed ( n q = 36.1 min −1 ) pump-turbine model was experimentally investigated. Firstly, the hump characteristic was obtained under 19 mm guide vane opening conditions. More interestingly, when the hump characteristic was measured in two directions (increasing and decreasing the discharge), characteristic hysteresis was found in the hump region. The analysis of performance characteristics reveals that the hump instability is the result of Euler momentum and hydraulic losses, and different Euler momentum and hydraulic losses in the two development processes lead to the hysteresis phenomenon. Then, 12 pressure sensors were mounted in the different parts of the pump-turbine model to obtain the time and frequency characteristics. The analysis of the corresponding fast Fourier transform confirms that the hump characteristic is related to low-frequency (0.04–0.15 times rotational frequency) vortices. The occurrence and cessation of vortices depend on the operating condition and measurement direction, which contribute to the hysteresis feature. Finally, the type of the low-frequency vortices was analyzed through the cross power spectrum.

Suggested Citation

  • Deyou Li & Hongjie Wang & Jinxia Chen & Torbjørn K. Nielsen & Daqing Qin & Xianzhu Wei, 2016. "Hysteresis Characteristic in the Hump Region of a Pump-Turbine Model," Energies, MDPI, vol. 9(8), pages 1-18, August.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:8:p:620-:d:75421
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    Citations

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    Cited by:

    1. Yang, Jun & Pavesi, Giorgio & Liu, Xiaohua & Xie, Tian & Liu, Jun, 2018. "Unsteady flow characteristics regarding hump instability in the first stage of a multistage pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 127(C), pages 377-385.
    2. Li, Deyou & Song, Yechen & Lin, Song & Wang, Hongjie & Qin, Yonglin & Wei, Xianzhu, 2021. "Effect mechanism of cavitation on the hump characteristic of a pump-turbine," Renewable Energy, Elsevier, vol. 167(C), pages 369-383.
    3. Li, Deyou & Zuo, Zhigang & Wang, Hongjie & Liu, Shuhong & Wei, Xianzhu & Qin, Daqing, 2019. "Review of positive slopes on pump performance characteristics of pump-turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 901-916.
    4. Li, Deyou & Wang, Hongjie & Qin, Yonglin & Li, Zhenggui & Wei, Xianzhu & Qin, Daqing, 2018. "Mechanism of high amplitude low frequency fluctuations in a pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 126(C), pages 668-680.
    5. 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.
    6. Li, Deyou & Wang, Hongjie & Qin, Yonglin & Wei, Xianzhu & Qin, Daqing, 2018. "Numerical simulation of hysteresis characteristic in the hump region of a pump-turbine model," Renewable Energy, Elsevier, vol. 115(C), pages 433-447.
    7. Suh, Jun-Won & Yang, Hyeon-Mo & Kim, Jin-Hyuk & Joo, Won-Gu & Park, Jungwan & Choi, Young-Seok, 2021. "Unstable S-shaped characteristics of a pump-turbine unit in a lab-scale model," Renewable Energy, Elsevier, vol. 171(C), pages 1395-1417.

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