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A new method of dynamic mesh used in continuous guide vane closure of a reversible pump-turbine in generating mode

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Abstract

In this paper, a new method of dynamic mesh based on two functional controls is used in the continuous guide vane closure, and the three-dimensional numerical simulation is carried out to investigate the transient flow characteristics for a Francis-type reversible pump-turbine in the turbine mode in the load regulation scenario, with the detached eddy simulation (DES) turbulent model. The transient flow characteristics during the closure of the guide vanes are illustrated by analyzing the signals of the mass flow, the torque and the pressure fluctuations in the frequency and time-frequency domains. It is shown by the simulated results that a continuous assessment of the transient flow characteristics during the guide vane closure may be made by using the new method of the dynamic mesh. Furthermore, the flow field analysis involves both the onset and the development of the unsteady phenomena progressively based on an organized guide vane closure law. The flow pattern in the return channel maintains a relatively stable flow field before the last stage of the closure, as compared with the unstable flow field in other domains. To identify the unit variation under the fluid-dynamical conditions, the influence of the three-dimensional unsteady flow structures in the passage is analyzed and its evolution during this transient process is characterized by the fluid-dynamics and the spectral analysis.

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Authors and Affiliations

  1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, 712100, China

    Xiu-li Mao  (毛秀丽)

  2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China

    Yuan Zheng  (郑源) & Zhan-shan Xie  (谢占山)

  3. Department of Industrial Engineering, University of Padua, Padova, Italy

    Giorgio Pavesi

Authors
  1. Xiu-li Mao  (毛秀丽)
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  2. Yuan Zheng  (郑源)
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  3. Giorgio Pavesi
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  4. Zhan-shan Xie  (谢占山)
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Corresponding author

Correspondence to Yuan Zheng  (郑源).

Additional information

Project supported by the National Natural Science Foundation of China (Grant No. 51909222).

Biography: Xiu-li Mao (1991-), Female, Ph. D., Lecturer

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Mao, Xl., Zheng, Y., Pavesi, G. et al. A new method of dynamic mesh used in continuous guide vane closure of a reversible pump-turbine in generating mode. J Hydrodyn 31, 976–985 (2019). https://doi.org/10.1007/s42241-018-0146-y

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  • DOI: https://doi.org/10.1007/s42241-018-0146-y

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