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Review of hydrodynamics instabilities in Francis turbine during off-design and transient operations

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  • Goyal, Rahul
  • Gandhi, Bhupendra K.

Abstract

Electricity generation from solar and wind has raised a significant concern about the stability of grid networks. Hydroelectricity plays an important role to balance the stability of grid network. In order to improve the stability of presently high loaded grids, hydropower plants are being operated over a wide range of operations and experiencing frequent start-stop, load variation, and emergency shutdown. The power generating unit including turbine needs to sustain sudden change in its operating condition to balance the grid frequency. The objective of this paper is to present the operating problems of Francis turbine in the present energy generation scenario. The turbine suffers from several dynamic instabilities during off-design and transient operations. Several low and high-frequency pressure fluctuations are observed during both, steady state and transient operating conditions. The off-design operations such as part load and high load cause pressure fluctuations due to RSI, RVR and cavitation. The transient operations lead to heavy cyclic loading of its moving and stationary parts. Francis turbine also experiences asymmetric loading on the runner, cyclic stress, wear and tear; all of which reduce operating life of the components. Sometimes these rapid transient may cause failure of the unit and decouple it from the system.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:116:y:2018:i:pa:p:697-709
    DOI: 10.1016/j.renene.2017.10.012
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    6. K., Subramanya & Chelliah, Thanga Raj, 2023. "Capability of synchronous and asynchronous hydropower generating systems: A comprehensive study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).
    7. Jesline Joy & Mehrdad Raisee & Michel J. Cervantes, 2022. "Hydraulic Performance of a Francis Turbine with a Variable Draft Tube Guide Vane System to Mitigate Pressure Pulsations," Energies, MDPI, vol. 15(18), pages 1-20, September.
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    10. Maria Cristina Morani & Mariana Simão & Ignac Gazur & Rui S. Santos & Armando Carravetta & Oreste Fecarotta & Helena M. Ramos, 2022. "Pressure Drop and Energy Recovery with a New Centrifugal Micro-Turbine: Fundamentals and Application in a Real WDN," Energies, MDPI, vol. 15(4), pages 1-25, February.
    11. 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.
    12. Jafarzadeh Juposhti, Hessan & Maddahian, Reza & Cervantes, Michel J., 2021. "Optimization of axial water injection to mitigate the Rotating Vortex Rope in a Francis turbine," Renewable Energy, Elsevier, vol. 175(C), pages 214-231.
    13. He, Xianghui & Hu, Jinhong & Zhao, Zhigao & Lin, Jie & Xiao, Pengfei & Yang, Jiandong & Yang, Jiebin, 2023. "Water column separation under one-after-another load rejection in pumped storage station," Energy, Elsevier, vol. 278(C).
    14. Dollon, Q. & Antoni, J. & Tahan, A. & Gagnon, M. & Monette, C., 2021. "Operational Modal Analysis of hydroelectric turbines using an order based likelihood approach," Renewable Energy, Elsevier, vol. 165(P1), pages 799-811.
    15. Joy, Jesline & Raisee, Mehrdad & Cervantes, Michel J., 2023. "Experimental investigation of an adjustable guide vane system in a Francis turbine draft tube at part load operation," Renewable Energy, Elsevier, vol. 210(C), pages 737-750.
    16. He, Xianghui & Yang, Jiandong & Yang, Jiebin & Zhao, Zhigao & Hu, Jinhong & Peng, Tao, 2023. "Evolution mechanism of water column separation in pump turbine: Model experiment and occurrence criterion," Energy, Elsevier, vol. 265(C).
    17. Yang, Zhiyan & Cheng, Yongguang & Xia, Linsheng & Meng, Wanwan & Liu, Ke & Zhang, Xiaoxi, 2020. "Evolutions of flow patterns and pressure fluctuations in a prototype pump-turbine during the runaway transient process after pump-trip," Renewable Energy, Elsevier, vol. 152(C), pages 1149-1159.
    18. Salehi, Saeed & Nilsson, Håkan, 2022. "Flow-induced pulsations in Francis turbines during startup - A consequence of an intermittent energy system," Renewable Energy, Elsevier, vol. 188(C), pages 1166-1183.
    19. Salehi, Saeed & Nilsson, Håkan, 2022. "Effects of uncertainties in positioning of PIV plane on validation of CFD results of a high-head Francis turbine model," Renewable Energy, Elsevier, vol. 193(C), pages 57-75.
    20. Salehi, Saeed & Nilsson, Håkan & Lillberg, Eric & Edh, Nicolas, 2021. "An in-depth numerical analysis of transient flow field in a Francis turbine during shutdown," Renewable Energy, Elsevier, vol. 179(C), pages 2322-2347.
    21. Rocchetta, R. & Bellani, L. & Compare, M. & Zio, E. & Patelli, E., 2019. "A reinforcement learning framework for optimal operation and maintenance of power grids," Applied Energy, Elsevier, vol. 241(C), pages 291-301.
    22. Sun, Longgang & Guo, Pengcheng & Yan, Jianguo, 2021. "Transient analysis of load rejection for a high-head Francis turbine based on structured overset mesh," Renewable Energy, Elsevier, vol. 171(C), pages 658-671.
    23. 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).
    24. Su, Wen-Tao & Binama, Maxime & Li, Yang & Zhao, Yue, 2020. "Study on the method of reducing the pressure fluctuation of hydraulic turbine by optimizing the draft tube pressure distribution," Renewable Energy, Elsevier, vol. 162(C), pages 550-560.
    25. Menéndez, Javier & Fernández-Oro, Jesús M. & Galdo, Mónica & Loredo, Jorge, 2019. "Pumped-storage hydropower plants with underground reservoir: Influence of air pressure on the efficiency of the Francis turbine and energy production," Renewable Energy, Elsevier, vol. 143(C), pages 1427-1438.

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