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Numerical Study on the Internal Flow Field of a Reversible Turbine during Continuous Guide Vane Closing

Author

Listed:
  • Xiuli Mao

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Xikang Road 1, Nanjing 210098, China
    These authors contributed equally to this work.)

  • Andrea Dal Monte

    (Department of Industrial Engineering, University of Padua, Via Venezia 1, Padua I-35131, Italy
    These authors contributed equally to this work.)

  • Ernesto Benini

    (Department of Industrial Engineering, University of Padua, Via Venezia 1, Padua I-35131, Italy)

  • Yuan Zheng

    (College of Water Conservancy and Hydropower Engineering, Hohai University, Xikang Road 1, Nanjing 210098, China
    National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Xikang Road 1, Nanjing 210098, China)

Abstract

The unsteady flow field in a reversible pump-turbine is investigated during the continuous load rejection using a 3D computational fluid dynamic analysis. Numerical calculations are carried out using the detached eddy simulation (DES) turbulence model and a new approach involving automatic mesh motion. In this way, the instability of the flow field is analyzed by continuously changing the guide vane openings from the best efficiency point (BEP). Unsteady flow characteristics are described by post-processing signals for several monitoring points including mass flow, torque, head and pressure in the frequency and time-frequency domains. The formation of vortices of different scales is observed from the origin to further enlargement and stabilization; the effect of the rotating structures on the flow passage is analyzed, and the influence of unsteady flow development on the performance of the turbine is investigated. Finally, the evolution during the period of load rejection is characterized in order to determine the hydrodynamic conditions causing the vibrations in the machine.

Suggested Citation

  • Xiuli Mao & Andrea Dal Monte & Ernesto Benini & Yuan Zheng, 2017. "Numerical Study on the Internal Flow Field of a Reversible Turbine during Continuous Guide Vane Closing," Energies, MDPI, vol. 10(7), pages 1-22, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:988-:d:104514
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    References listed on IDEAS

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    Cited by:

    1. Myung Gon Choi & Jaiyoung Ryu, 2018. "Numerical Study of the Axial Gap and Hot Streak Effects on Thermal and Flow Characteristics in Two-Stage High Pressure Gas Turbine," Energies, MDPI, vol. 11(10), pages 1-15, October.
    2. Li, Deyou & Fu, Xiaolong & Zuo, Zhigang & Wang, Hongjie & Li, Zhenggui & Liu, Shuhong & Wei, Xianzhu, 2019. "Investigation methods for analysis of transient phenomena concerning design and operation of hydraulic-machine systems—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 101(C), pages 26-46.
    3. Daqing Zhou & Huixiang Chen & Languo Zhang, 2018. "Investigation of Pumped Storage Hydropower Power-Off Transient Process Using 3D Numerical Simulation Based on SP-VOF Hybrid Model," Energies, MDPI, vol. 11(4), pages 1-16, April.
    4. Zheming Tong & Zhongqin Yang & Qing Huang & Qiang Yao, 2022. "Numerical Modeling of the Hydrodynamic Performance of Slanted Axial-Flow Urban Drainage Pumps at Shut-Off Condition," Energies, MDPI, vol. 15(5), pages 1-17, March.

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