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Influence of Upstream Disturbances on the Vortex Structure of Francis Turbine Based on the Criteria of Identification of Various Vortexes

Author

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  • Tao Guo

    (Department of Engineering Mechanics, Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China)

  • Lihui Xu

    (Department of Engineering Mechanics, Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China)

  • Wenquan Wang

    (State Key Laboratory of Hydropower and Mountain River Engineering, Sichuan University, Chengdu 610065, China)

Abstract

The inter-blade passage vortex, the vortex rope of the draft tube, and the vortex in the guide apparatus are the characteristics of flow instability of the Francis turbine, which may lead to fatigue failure in serious cases. In the current study, in order to accurately capture the transient turbulent characteristics of flow under different conditions and fully understand the flow field and vortex structure, we conduct a simulation that adopts sliding grid technology and the large-eddy simulation (LES) method based on the wall-adapting local eddy viscosity (WALE) model. Using the pressure iso-surface method, the Q criterion, and the latest third-generation Liutex vortex identification method, this study analyzes and compares the inter-blade passage vortex, the vortex rope of the draft tube, and the outflow and vortex in the guide apparatus, focusing on the capture ability of flow field information by various vortex identification methods and the unique vortex structure under the condition of a small opening. The results indicate that the dependence of Liutex on the threshold is small, and the scale range of the flow direction vortex captured by Liutex is wider, but the ability of the spanwise vortex is relatively weak. The smaller the opening, the more disorderly the vortexes generated in each component and the more unstable the flow field. In the draft tube, the original shape of the vortex rope is destroyed due to the interaction between vortexes. Under the condition of a small opening, an inter-blade passage vortex is generated, affecting the efficient and stable operation of the turbine.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:22:p:7626-:d:679440
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    References listed on IDEAS

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    1. Zhang, Yuning & Liu, Kaihua & Xian, Haizhen & Du, Xiaoze, 2018. "A review of methods for vortex identification in hydroturbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 1269-1285.
    2. 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.
    3. 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.
    4. 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.
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    Cited by:

    1. Lihui, Xu & Tao, Guo & Wenquan, Wang, 2022. "Effects of Vortex Structure on Hydraulic Loss in a Low Head Francis Turbine under Overall Operating Conditions Base on Entropy Production Method," Renewable Energy, Elsevier, vol. 198(C), pages 367-379.
    2. Jianyong Hu & Qingbo Wang & Zhenzhu Meng & Hongge Song & Bowen Chen & Hui Shen, 2023. "Numerical Study of the Internal Fluid Dynamics of Draft Tube in Seawater Pumped Storage Hydropower Plant," Sustainability, MDPI, vol. 15(10), pages 1-17, May.

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