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Investigation of Pressure Fluctuation and Pulsating Hydraulic Axial Thrust in Francis Turbines

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  • Xing Zhou

    (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
    Department of Applied Mechanics and Aerospace Engineering, Waseda University, Tokyo 1690072, Japan)

  • Changzheng Shi

    (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China)

  • Kazuyoshi Miyagawa

    (Department of Applied Mechanics and Aerospace Engineering, Waseda University, Tokyo 1690072, Japan)

  • Hegao Wu

    (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China)

  • Jinhong Yu

    (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China)

  • Zhu Ma

    (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China)

Abstract

Under the circumstances of rapid expansion of diverse forms of volatile and intermittent renewable energy sources, hydropower stations have become increasingly indispensable for improving the quality of energy conversion processes. As a consequence, Francis turbines, one of the most popular options, need to operate under off-design conditions, particularly for partial load operation. In this paper, a prototype Francis turbine was used to investigate the pressure fluctuations and hydraulic axial thrust pulsation under four partial load conditions. The analyses of pressure fluctuations in the vaneless space, runner, and draft tube are discussed in detail. The observed precession frequency of the vortex rope is 0.24 times that of the runner rotational frequency, which is able to travel upstream (from the draft tube to the vaneless space). Frequencies of both 24.0 and 15.0 times that of the runner rotational frequency are detected in the recording points of the runner surface, while the main dominant frequency recorded in the vaneless zone is 15.0 times that of the runner rotational frequency. Apart from unsteady pressure fluctuations, the pulsating property of hydraulic axial thrust is discussed in depth. In conclusion, the pulsation of hydraulic axial thrust is derived from the pressure fluctuations of the runner surface and is more complicated than the pressure fluctuations.

Suggested Citation

  • Xing Zhou & Changzheng Shi & Kazuyoshi Miyagawa & Hegao Wu & Jinhong Yu & Zhu Ma, 2020. "Investigation of Pressure Fluctuation and Pulsating Hydraulic Axial Thrust in Francis Turbines," Energies, MDPI, vol. 13(7), pages 1-16, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1734-:d:341684
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    Cited by:

    1. Nirmal Acharya & Saroj Gautam & Sailesh Chitrakar & Chirag Trivedi & Ole Gunnar Dahlhaug, 2021. "Leakage Vortex Progression through a Guide Vane’s Clearance Gap and the Resulting Pressure Fluctuation in a Francis Turbine," Energies, MDPI, vol. 14(14), pages 1-19, July.
    2. Zhou, Xing & Shi, Changzheng & Miyagawa, Kazuyoshi & Wu, Hegao, 2021. "Effect of modified draft tube with inclined conical diffuser on flow instabilities in Francis turbine," Renewable Energy, Elsevier, vol. 172(C), pages 606-617.
    3. Zhou, Xing & Wu, Hegao & Cheng, Li & Huang, Quanshui & Shi, Changzheng, 2023. "A new draft tube shape optimisation methodology of introducing inclined conical diffuser in hydraulic turbine," Energy, Elsevier, vol. 265(C).
    4. Yongsheng Liu & Chengming Liu & Yongsheng Zhang & Xingxing Huang & Tao Guo & Lingjiu Zhou & Zhengwei Wang, 2023. "Influence of Axial Installation Deviation on the Hydraulic Axial Force of the 1000 MW Francis Runner in the Rated Operating Condition," Energies, MDPI, vol. 16(4), pages 1-20, February.

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