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Investigation on mutual traveling influences between the draft tube and upstream components of a Francis turbine unit

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  • Muhirwa, Alexis
  • Li, Biao
  • Su, Wen-Tao
  • Liu, Quan-Zhong
  • Binama, Maxime
  • Wu, Jian
  • Cai, Wei-Hua

Abstract

Owing to an inconsistent load demand, hydraulic turbines are often operated under off-load range. Resultant flow instabilities comprise low-frequency pressure fluctuations, which are dependent on the operating condition and unavoidable high-frequency fluctuations evolving from the interactional design concept of hydrofoils. Through the analysis of averaged flow parameters within the runner, this article investigates the mechanism of reciprocity in flow instabilities between draft tube and upstream components. Two recommended operating conditions are used to approximate harmless traveling disturbances, and two part-load discharges are discussed accordingly. The CFD commercial code ANSYS CFX has been used for unsteady flow simulation, where the Shear Stress Transport (SST) turbulence model has been adopted. The used numerical scheme has been validated through experiments in terms of pressure pulsation characteristics, and findings display a good agreement. It has been found that low-frequency disturbances, as instabilities taking source from the fluid structure itself, can override strong flow gradients and exert a higher backward influence farther than high-frequency perturbations. The low-frequency component and its harmonic strengthened by the wall impact feedback are less sensitive to the backward damping. The blade passing frequency dominates the draft tube inlet to influence the local pressure recovery; but it is rapidly diffused and tapped by the low-frequency core instability.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:162:y:2020:i:c:p:973-992
    DOI: 10.1016/j.renene.2020.08.107
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    References listed on IDEAS

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    Cited by:

    1. Du, Jiyun & Ge, Zhan & Wu, Hao & Shi, Xudong & Yuan, Fangyang & Yu, Wei & Wang, Dongxiang & Yang, Xinjun, 2022. "Study on the effects of runner geometric parameters on the performance of micro Francis turbines used in water supply system of high-rise buildings," Energy, Elsevier, vol. 256(C).
    2. Tao Guo & Lihui Xu & Wenquan Wang, 2021. "Influence of Upstream Disturbances on the Vortex Structure of Francis Turbine Based on the Criteria of Identification of Various Vortexes," Energies, MDPI, vol. 14(22), pages 1-21, November.
    3. Gongcheng Liu & Xudi Qiu & Jiayi Ma & Diyi Chen & Xiao Liang, 2022. "Influence of Flexible Generation Mode on the Stability of Hydropower Generation System: Stability Assessment of Part-Load Operation," Energies, MDPI, vol. 15(11), pages 1-19, May.
    4. Binama, Maxime & Kan, Kan & Chen, Hui-Xiang & Zheng, Yuan & Zhou, Daqing & Su, Wen-Tao & Muhirwa, Alexis & Ntayomba, James, 2021. "Flow instability transferability characteristics within a reversible pump turbine (RPT) under large guide vane opening (GVO)," Renewable Energy, Elsevier, vol. 179(C), pages 285-307.

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