Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal Pump
In order to study the unsteady flow and vortex characteristics of tongue cavitation, numerical calculation is carried out for the whole flow channel given different conditions. Then, the calculation results are verified experimentally. The results show that after the occurrence of tongue cavitation...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2024-01-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | https://www.jafmonline.net/article_2371_2a9c58f278bccdb76e12640df8fc5088.pdf |
| _version_ | 1797369830277382144 |
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| author | Z. Y. Luo Y. Feng X. Y. Sun Y. Gong J. X. Lu X. W. Zhang |
| author_facet | Z. Y. Luo Y. Feng X. Y. Sun Y. Gong J. X. Lu X. W. Zhang |
| author_sort | Z. Y. Luo |
| collection | DOAJ |
| description | In order to study the unsteady flow and vortex characteristics of tongue cavitation, numerical calculation is carried out for the whole flow channel given different conditions. Then, the calculation results are verified experimentally. The results show that after the occurrence of tongue cavitation in the centrifugal pump, it deteriorates with the decrease of NPSHa. However, when NPSHa is reduced to 3.78 m, it does not change significantly anymore with the decrease of NPSHa. The extrusion of fluid by the vapor at the tongue promotes the formation of the separation vortex, and the re-jet flow caused by the separation vortex leads to vapor shedding. The frequency of cavitation shedding is consistent with the frequency of vortex shedding. In the vorticity transport equation, the relative vortex stretching term and the relative vortex dilatation term dominate the vapor shedding by controlling the change in vorticity. The baroclinic torque term mainly affects the change of vorticity at the vapor-liquid interface, but to a much lesser extent than the first two terms. |
| first_indexed | 2024-03-08T17:52:34Z |
| format | Article |
| id | doaj.art-dca7c809979b464fbafbc1f39c315a64 |
| institution | Directory Open Access Journal |
| issn | 1735-3572 1735-3645 |
| language | English |
| last_indexed | 2024-03-08T17:52:34Z |
| publishDate | 2024-01-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-dca7c809979b464fbafbc1f39c315a642024-01-02T06:56:37ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452024-01-0117364665710.47176/jafm.17.3.21812371Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal PumpZ. Y. Luo0Y. Feng1X. Y. Sun2Y. Gong3J. X. Lu4X. W. Zhang5Chengdu Fluid Dynamics Innovation Center, Chengdu, 610071, ChinaChengdu Fluid Dynamics Innovation Center, Chengdu, 610071, ChinaChengdu Fluid Dynamics Innovation Center, Chengdu, 610071, ChinaKey Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, 610039, ChinaKey Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, 610039, ChinaCollege of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, ChinaIn order to study the unsteady flow and vortex characteristics of tongue cavitation, numerical calculation is carried out for the whole flow channel given different conditions. Then, the calculation results are verified experimentally. The results show that after the occurrence of tongue cavitation in the centrifugal pump, it deteriorates with the decrease of NPSHa. However, when NPSHa is reduced to 3.78 m, it does not change significantly anymore with the decrease of NPSHa. The extrusion of fluid by the vapor at the tongue promotes the formation of the separation vortex, and the re-jet flow caused by the separation vortex leads to vapor shedding. The frequency of cavitation shedding is consistent with the frequency of vortex shedding. In the vorticity transport equation, the relative vortex stretching term and the relative vortex dilatation term dominate the vapor shedding by controlling the change in vorticity. The baroclinic torque term mainly affects the change of vorticity at the vapor-liquid interface, but to a much lesser extent than the first two terms.https://www.jafmonline.net/article_2371_2a9c58f278bccdb76e12640df8fc5088.pdfcentrifugal pumptongue cavitationvortexvorticity transport equationstability |
| spellingShingle | Z. Y. Luo Y. Feng X. Y. Sun Y. Gong J. X. Lu X. W. Zhang Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal Pump Journal of Applied Fluid Mechanics centrifugal pump tongue cavitation vortex vorticity transport equation stability |
| title | Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal Pump |
| title_full | Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal Pump |
| title_fullStr | Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal Pump |
| title_full_unstemmed | Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal Pump |
| title_short | Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal Pump |
| title_sort | research on the unsteady flow and vortex characteristics of cavitation at the tongue in centrifugal pump |
| topic | centrifugal pump tongue cavitation vortex vorticity transport equation stability |
| url | https://www.jafmonline.net/article_2371_2a9c58f278bccdb76e12640df8fc5088.pdf |
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