Research on the energy characteristics of the turning region in the cavitation performance curve of an axial flow pump based on energy flow density and entropy production
Cavitation significantly impacts the performance and stability of axial flow pumps, yet the underlying mechanisms driving head rise in the cavitation curve remain inadequately understood. This study provides a novel exploration of internal flow dynamics and energy dissipation in the turning region o...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2025-12-01
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| Series: | Engineering Applications of Computational Fluid Mechanics |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/19942060.2025.2499132 |
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| author | Lei Yu Li Cheng Weigao Sheng Shuaihao Lei Wentao Xu Jiantao Shen |
| author_facet | Lei Yu Li Cheng Weigao Sheng Shuaihao Lei Wentao Xu Jiantao Shen |
| author_sort | Lei Yu |
| collection | DOAJ |
| description | Cavitation significantly impacts the performance and stability of axial flow pumps, yet the underlying mechanisms driving head rise in the cavitation curve remain inadequately understood. This study provides a novel exploration of internal flow dynamics and energy dissipation in the turning region of the cavitation curve, where head rises. By integrating vortex dynamics and entropy production theory, the intricate interplay between cavitation-induced flow separation and energy loss is revealed. Numerical simulations, validated by experimental data, are employed to analyze energy flow density fluctuations caused by pressure pulsations across different pump regions. The results uncover a critical link between abrupt energy flow density variations and localised high-energy dissipation, which originate from flow separation on the suction side of the impeller blades. Specifically, at the cavitation coefficient where head rise begins, flow separation emerges around the mid-tip region due to cavitation effects at the blade tip and suction surface. As cavitation intensifies and head reaches its peak, the separation zone progressively expands from tip to hub, further amplifying energy dissipation. Beyond this point, excessive cavitation triggers a rapid head drop, shifting the separation zone toward the trailing edge and enhancing the development of the tip separation leakage vortex. This study not only elucidates the physical mechanisms governing head rise under cavitation but also establishes a deeper connection between energy loss and cavitation dynamics, offering valuable insights for optimising axial flow pump performance in cavitating conditions. |
| format | Article |
| id | doaj-art-96f8972d13dc47ef8175067a0443f3ee |
| institution | OA Journals |
| issn | 1994-2060 1997-003X |
| language | English |
| publishDate | 2025-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Engineering Applications of Computational Fluid Mechanics |
| spelling | doaj-art-96f8972d13dc47ef8175067a0443f3ee2025-08-20T01:51:04ZengTaylor & Francis GroupEngineering Applications of Computational Fluid Mechanics1994-20601997-003X2025-12-0119110.1080/19942060.2025.2499132Research on the energy characteristics of the turning region in the cavitation performance curve of an axial flow pump based on energy flow density and entropy productionLei Yu0Li Cheng1Weigao Sheng2Shuaihao Lei3Wentao Xu4Jiantao Shen5College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, People’s Republic of ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, People’s Republic of ChinaHuaishuxinhe Management Office, Huai’an, People’s Republic of ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, People’s Republic of ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, People’s Republic of ChinaCollege of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, People’s Republic of ChinaCavitation significantly impacts the performance and stability of axial flow pumps, yet the underlying mechanisms driving head rise in the cavitation curve remain inadequately understood. This study provides a novel exploration of internal flow dynamics and energy dissipation in the turning region of the cavitation curve, where head rises. By integrating vortex dynamics and entropy production theory, the intricate interplay between cavitation-induced flow separation and energy loss is revealed. Numerical simulations, validated by experimental data, are employed to analyze energy flow density fluctuations caused by pressure pulsations across different pump regions. The results uncover a critical link between abrupt energy flow density variations and localised high-energy dissipation, which originate from flow separation on the suction side of the impeller blades. Specifically, at the cavitation coefficient where head rise begins, flow separation emerges around the mid-tip region due to cavitation effects at the blade tip and suction surface. As cavitation intensifies and head reaches its peak, the separation zone progressively expands from tip to hub, further amplifying energy dissipation. Beyond this point, excessive cavitation triggers a rapid head drop, shifting the separation zone toward the trailing edge and enhancing the development of the tip separation leakage vortex. This study not only elucidates the physical mechanisms governing head rise under cavitation but also establishes a deeper connection between energy loss and cavitation dynamics, offering valuable insights for optimising axial flow pump performance in cavitating conditions.https://www.tandfonline.com/doi/10.1080/19942060.2025.2499132Axial flow pumpcavitationenergy losspressure fluctuationenergy flow densitytip separation leakage vortex |
| spellingShingle | Lei Yu Li Cheng Weigao Sheng Shuaihao Lei Wentao Xu Jiantao Shen Research on the energy characteristics of the turning region in the cavitation performance curve of an axial flow pump based on energy flow density and entropy production Engineering Applications of Computational Fluid Mechanics Axial flow pump cavitation energy loss pressure fluctuation energy flow density tip separation leakage vortex |
| title | Research on the energy characteristics of the turning region in the cavitation performance curve of an axial flow pump based on energy flow density and entropy production |
| title_full | Research on the energy characteristics of the turning region in the cavitation performance curve of an axial flow pump based on energy flow density and entropy production |
| title_fullStr | Research on the energy characteristics of the turning region in the cavitation performance curve of an axial flow pump based on energy flow density and entropy production |
| title_full_unstemmed | Research on the energy characteristics of the turning region in the cavitation performance curve of an axial flow pump based on energy flow density and entropy production |
| title_short | Research on the energy characteristics of the turning region in the cavitation performance curve of an axial flow pump based on energy flow density and entropy production |
| title_sort | research on the energy characteristics of the turning region in the cavitation performance curve of an axial flow pump based on energy flow density and entropy production |
| topic | Axial flow pump cavitation energy loss pressure fluctuation energy flow density tip separation leakage vortex |
| url | https://www.tandfonline.com/doi/10.1080/19942060.2025.2499132 |
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