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Numerical Study on the Dynamic Behavior of a Francis Turbine Runner Model with a Crack

Author

Listed:
  • Ming Zhang

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, CO 08028 Barcelona, Spain)

  • David Valentin

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, CO 08028 Barcelona, Spain)

  • Carme Valero

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, CO 08028 Barcelona, Spain)

  • Mònica Egusquiza

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, CO 08028 Barcelona, Spain)

  • Weiqiang Zhao

    (Center for Industrial Diagnostics and Fluid Dynamics (CDIF), Polytechnic University of Catalonia (UPC), Av. Diagonal, 647, ETSEIB, CO 08028 Barcelona, Spain)

Abstract

Crack appearance in the blade is the most common type of fatigue damage in Francis turbines. However, it is sometimes difficult to detect cracks in time using the current monitoring system, even when they are very large. To better monitor cracks, it is imperative to research the effect of a crack on the dynamic behavior of a Francis turbine. In this paper, the dynamic behavior of a Francis turbine runner model with a crack has been researched numerically. The intact numerical model was first validated by the experimental data available. Then, a crack was created at the intersection line between one blade and the crown. The change in dynamic behavior with increasing crack length has been investigated. Crack-induced vibration localization theory has been used to explain the dynamic behavior changes due to the crack. Modal analysis showed that the adopted theory could basically explain the modal behavior change due to the crack. The FFT results of the modal shapes and the localization factors ( LF ) has been used to explain the forced response changes due to the crack. Based on the above analysis, the challenge of crack monitoring has been analyzed. This research provides some references for more advanced monitoring technologies.

Suggested Citation

  • Ming Zhang & David Valentin & Carme Valero & Mònica Egusquiza & Weiqiang Zhao, 2018. "Numerical Study on the Dynamic Behavior of a Francis Turbine Runner Model with a Crack," Energies, MDPI, vol. 11(7), pages 1-18, June.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1630-:d:153821
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    References listed on IDEAS

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    1. Liu, Xin & Luo, Yongyao & Wang, Zhengwei, 2016. "A review on fatigue damage mechanism in hydro turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1-14.
    2. Padhy, Mamata Kumari & Saini, R.P., 2008. "A review on silt erosion in hydro turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(7), pages 1974-1987, September.
    3. Carme Valero & Mònica Egusquiza & Eduard Egusquiza & Alexandre Presas & David Valentin & Matias Bossio, 2017. "Extension of Operating Range in Pump-Turbines. Influence of Head and Load," Energies, MDPI, vol. 10(12), pages 1-17, December.
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    Cited by:

    1. Zhu, Di & Tao, Ran & Xiao, Ruofu & Pan, Litan, 2020. "Solving the runner blade crack problem for a Francis hydro-turbine operating under condition-complexity," Renewable Energy, Elsevier, vol. 149(C), pages 298-320.
    2. Piotr Duda & Łukasz Felkowski & Adam Zieliński & Andrzej Duda, 2019. "An Analysis of a Reheater Failure and a Proposal to Upgrade the Device Design," Energies, MDPI, vol. 12(12), pages 1-10, June.

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