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Predicting unsteady behavior of a small francis turbine at several operating points

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  • Laouari, Ahmed
  • Ghenaiet, Adel

Abstract

The simulated pressure-time, recorded at several monitoring points through the components of a small Francis turbine, show that the rotor - stator interactions (RSI) cause strong pressure fluctuations and torque oscillations even for the best efficiency operating point (BEP). The pressure fluctuations frequency and the mode shape and their sequence are predicted. At the low discharge operating point the significant drop in the static pressure is distinguishable at the inlet of the runner. The amplitude of the dominant frequencies at the low discharge operating point are larger than at BEP, in addition to other captured frequencies related to the occurrence of the vortex rope in the draft tube. The pressure fluctuations occurring in the vaneless space tend to propagate beyond the runner outlet and are influenced by the interactions between the runner and the draft tube. At most unstable operating conditions the pressure pulses within the runner passages are mainly related to RSI and channel vortices.

Suggested Citation

  • Laouari, Ahmed & Ghenaiet, Adel, 2019. "Predicting unsteady behavior of a small francis turbine at several operating points," Renewable Energy, Elsevier, vol. 133(C), pages 712-724.
    • Handle: RePEc:eee:renene:v:133:y:2019:i:c:p:712-724
    DOI: 10.1016/j.renene.2018.08.111
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    References listed on IDEAS

    as
    1. Elbatran, A.H. & Yaakob, O.B. & Ahmed, Yasser M. & Shabara, H.M., 2015. "Operation, performance and economic analysis of low head micro-hydropower turbines for rural and remote areas: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 40-50.
    2. KC, Anup & Thapa, Bhola & Lee, Young-Ho, 2014. "Transient numerical analysis of rotor–stator interaction in a Francis turbine," Renewable Energy, Elsevier, vol. 65(C), pages 227-235.
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    1. Sotoudeh, Nahale & Maddahian, Reza & Cervantes, Michel J., 2020. "Investigation of Rotating Vortex Rope formation during load variation in a Francis turbine draft tube," Renewable Energy, Elsevier, vol. 151(C), pages 238-254.
    2. Laouari, Ahmed & Ghenaiet, Adel, 2021. "Investigation of steady and unsteady cavitating flows through a small Francis turbine," Renewable Energy, Elsevier, vol. 172(C), pages 841-861.
    3. 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.
    4. Meng Zhang & Jinhai Feng & Ziwen Zhao & Wei Zhang & Junzhi Zhang & Beibei Xu, 2022. "A 1D-3D Coupling Model to Evaluate Hydropower Generation System Stability," Energies, MDPI, vol. 15(19), pages 1-13, September.

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