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Study of the formation and dynamic characteristics of the vortex in the pump sump by CFD and experiment

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Abstract

The formation mechanism and the dynamic characteristics of the floor-attached vortex (FAV) in the pump sump are analyzed, with the velocity gradient as the key factor. The FAV is shown to be formed when the velocity gradient in the singular point area reaches a certain strength. The evolution of the FAV is accompanied by the energy accumulation and dissipation in the vortex area. The generated FAV is in the form of the vortex pair at the initial stage, with opposite directions of rotation. The vortex with the same rotating direction as the impeller is strong because the rotational kinetic energy is easy to accumulate. The circumferential velocity of the FAV first increases and then decreases with the radius of the vortex core, indicating the FAV is a kind of forced vortex. The radius with the largest velocity gradient is the radius of the vortex core.

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Acknowledgements

This work was supported by the Joint open fund of Tsinghua University, Ningxia Yinchuan Water Network Digital Water Control Joint Research Institute (Grant No. sklhse-2021-Iow10), the Priority Academic Program Development of Jiangsu Higher Education Institutions [PAPD].

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Authors and Affiliations

  1. State Key Laboratory of Hydro-science and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China

    Xi-jie Song, Rao Yao & Zheng-wei Wang

  2. Department of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou, 225100, China

    Liu Chao

Authors
  1. Xi-jie Song
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  2. Rao Yao
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  3. Liu Chao
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  4. Zheng-wei Wang
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Corresponding author

Correspondence to Liu Chao.

Additional information

Projects supported by the National Natural Science Foundation of China (Grant No. 51279173, 51876099).

Biography

Xi-jie Song (1990-), Male, Ph. D.

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Song, Xj., Yao, R., Chao, L. et al. Study of the formation and dynamic characteristics of the vortex in the pump sump by CFD and experiment. J Hydrodyn 33, 1202–1215 (2021). https://doi.org/10.1007/s42241-021-0095-8

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  • DOI: https://doi.org/10.1007/s42241-021-0095-8

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