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Experimental study of a Francis turbine under variable-speed and discharge conditions

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  • Trivedi, Chirag
  • Agnalt, Einar
  • Dahlhaug, Ole Gunnar

Abstract

This work investigates the unsteady pressure fluctuations in a hydraulic turbine that are observed during steep ramping. Although hydraulic turbines are expected to operate seamlessly during steep ramping, the resulting pressure amplitudes are so significant that they take a toll on a machine's operating life. Objective of the present study is to investigate time-dependent pressure amplitudes in the vaneless space, runner and draft tube during power ramping-up and -down under variable-speed configuration. Novelty is to vary both discharge and rotational speed of a runner. The measurements are performed on a high-head model Francis turbine. The investigations revealed that amplitudes of characteristics frequencies, especially rotor-stator interaction, are small during steep ramping however, at the end of transient cycle, the amplitudes quickly increased 30-fold. During steep ramping, blade passing frequency was appeared in the runner, which is uncommon phenomenon in high-head Francis turbines. Strong reflection of pressure waves towards runner from vaneless space (guide vane walls) may be one of the causes for the appearance of blade passing frequency in the runner.

Suggested Citation

  • Trivedi, Chirag & Agnalt, Einar & Dahlhaug, Ole Gunnar, 2018. "Experimental study of a Francis turbine under variable-speed and discharge conditions," Renewable Energy, Elsevier, vol. 119(C), pages 447-458.
    • Handle: RePEc:eee:renene:v:119:y:2018:i:c:p:447-458
    DOI: 10.1016/j.renene.2017.12.040
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    References listed on IDEAS

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    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. Trivedi, Chirag & Gandhi, Bhupendra K. & Cervantes, Michel J. & Dahlhaug, Ole Gunnar, 2015. "Experimental investigations of a model Francis turbine during shutdown at synchronous speed," Renewable Energy, Elsevier, vol. 83(C), pages 828-836.
    3. Caralis, G. & Papantonis, D. & Zervos, A., 2012. "The role of pumped storage systems towards the large scale wind integration in the Greek power supply system," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 2558-2565.
    4. Zuo, Zhigang & Liu, Shuhong & Sun, Yuekun & Wu, Yulin, 2015. "Pressure fluctuations in the vaneless space of High-head pump-turbines—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 965-974.
    5. Trivedi, Chirag & Agnalt, Einar & Dahlhaug, Ole Gunnar, 2017. "Investigations of unsteady pressure loading in a Francis turbine during variable-speed operation," Renewable Energy, Elsevier, vol. 113(C), pages 397-410.
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    3. Chen, Huixiang & Zhou, Daqing & Kan, Kan & Guo, Junxun & Zheng, Yuan & Binama, Maxime & Xu, Zhe & Feng, Jiangang, 2021. "Transient characteristics during the co-closing guide vanes and runner blades of a bulb turbine in load rejection process," Renewable Energy, Elsevier, vol. 165(P2), pages 28-41.
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    5. 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.
    6. Iman-Eini, Hossein & Frey, David & Bacha, Seddik & Boudinet, Cedric & Schanen, Jean-Luc, 2019. "Evaluation of loss effect on optimum operation of variable speed micro-hydropower energy conversion systems," Renewable Energy, Elsevier, vol. 131(C), pages 1022-1034.
    7. Lei, Liuwei & Li, Feng & Xu, Beibei & Egusquiza, Mònica & Luo, Xingqi & Zhang, Junzhi & Egusquiza, Eduard & Chen, Diyi & Jiang, Wei & Patelli, Edoardo, 2022. "Time-frequency domain characteristics analysis of a hydro-turbine governor system considering vortex rope excitation," Renewable Energy, Elsevier, vol. 183(C), pages 172-187.
    8. Muhirwa, Alexis & Li, Biao & Su, Wen-Tao & Liu, Quan-Zhong & Binama, Maxime & Wu, Jian & Cai, Wei-Hua, 2020. "Investigation on mutual traveling influences between the draft tube and upstream components of a Francis turbine unit," Renewable Energy, Elsevier, vol. 162(C), pages 973-992.
    9. Bosioc, Alin Ilie & Tănasă, Constantin, 2020. "Experimental study of swirling flow from conical diffusers using the water jet control method," Renewable Energy, Elsevier, vol. 152(C), pages 385-398.

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