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Transient numerical analysis of rotor–stator interaction in a Francis turbine

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  • KC, Anup
  • Thapa, Bhola
  • Lee, Young-Ho

Abstract

Pressure fluctuation due to rotor–stator interaction and occurrence of vortex rope in draft tube at partial load operation are obvious phenomena in Francis type reaction hydro turbines. These hydrodynamic effects are important issues and should be addressed during the design of hydraulic machines. A 3-dimensional transient state turbulent flow simulation in the entire flow passage of a 70 kW-Francis turbine having specific speed of 203.1 is conducted to investigate the rotor–stator interaction by adopting kω based SST turbulence model. The commercial 3D Navier–Stokes CFD solver Ansys-CFX is utilized to study the flow through this vertical shaft Francis turbine in its stationary and transient passages, at 100% optimum load and 72% of part load. The investigated turbine consists of a spiral casing with 16 guide vanes, 8 stay vanes, a runner with 13 blades and a draft tube. With a time step of 2° of a rotational period of the runner for 10 full rotations, the time dependent pressure and torque variations are monitored at the selected locations during the unsteady state calculation. A periodical behavior is observed for the pressure distribution in guide vanes, runner blades and torque in the runner blades. The pressure distribution curve in runner blades reveals the two dominating frequencies – the lower peaks due to runner speed and the upper peaks corresponding to the number of guide vanes interacting with the flow. The flow acceleration toward inside of the runner is depicted by the expanding wakes behind the stay vanes. Vortex rope is observed in draft tube, downstream the runner, at part-load operation.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:65:y:2014:i:c:p:227-235
    DOI: 10.1016/j.renene.2013.09.013
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    Citations

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    Cited by:

    1. 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.
    2. Zaher Mundher Yaseen & Ameen Mohammed Salih Ameen & Mohammed Suleman Aldlemy & Mumtaz Ali & Haitham Abdulmohsin Afan & Senlin Zhu & Ahmed Mohammed Sami Al-Janabi & Nadhir Al-Ansari & Tiyasha Tiyasha &, 2020. "State-of-the Art-Powerhouse, Dam Structure, and Turbine Operation and Vibrations," Sustainability, MDPI, vol. 12(4), pages 1-40, February.
    3. Goyal, Rahul & Gandhi, Bhupendra K., 2018. "Review of hydrodynamics instabilities in Francis turbine during off-design and transient operations," Renewable Energy, Elsevier, vol. 116(PA), pages 697-709.
    4. Adnan Aslam Noon & Man-Hoe Kim, 2021. "Sediment and Cavitation Erosion in Francis Turbines—Review of Latest Experimental and Numerical Techniques," Energies, MDPI, vol. 14(6), pages 1-19, March.
    5. Hoghooghi, Hadi & Durali, Mohammad & Kashef, Amin, 2018. "A new low-cost swirler for axial micro hydro turbines of low head potential," Renewable Energy, Elsevier, vol. 128(PA), pages 375-390.
    6. Chitrakar, Sailesh & Neopane, Hari Prasad & Dahlhaug, Ole Gunnar, 2016. "Study of the simultaneous effects of secondary flow and sediment erosion in Francis turbines," Renewable Energy, Elsevier, vol. 97(C), pages 881-891.
    7. KC, Anup & Lee, Young Ho & Thapa, Bhola, 2016. "CFD study on prediction of vortex shedding in draft tube of Francis turbine and vortex control techniques," Renewable Energy, Elsevier, vol. 86(C), pages 1406-1421.
    8. Qian, Zhongdong & Wang, Fan & Guo, Zhiwei & Lu, Jie, 2016. "Performance evaluation of an axial-flow pump with adjustable guide vanes in turbine mode," Renewable Energy, Elsevier, vol. 99(C), pages 1146-1152.
    9. 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.

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