Flow characteristics of large-scale Francis turbine during transient processes.
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| Title: | Flow characteristics of large-scale Francis turbine during transient processes. |
|---|---|
| Authors: | He, Xiuru1 he_xiuru@ctg.com.cn, Liao, Xiangbo1 liao_xiangbo@ctg.com.cn, Luo, Qianlin1 luo_qianlin@ctg.com.cn, Zhao, Wengui1 zhao_wengui@ctg.com.cn, An, Xueli2 an_xueli@163.com |
| Source: | Journal of Vibroengineering. May2026, Vol. 28 Issue 3, p705-719. 15p. |
| Subjects: | Francis turbines, Transients (Dynamics), Aeroacoustics, Fluid dynamics, Turbulence, Mechanical vibration research, Computational fluid dynamics |
| Abstract: | With the continuous establishment and improvement of the new power system, higher requirements have been imposed on the operation of large-scale hydroelectric generating units, which makes the flow inside the turbine more complex. This study employed the computational fluid dynamics (CFD) method based on the SST κ-ω turbulence model to numerically simulate the internal flow field of a large Francis turbine during the load reduction transition process, and coupled an acoustic model to analyze its flow-induced noise. The results show that under a constant head, as the guide vane opening decreases (load reduces), the low-pressure and low-speed zone inside the runner expands from the blade outlet to the inlet, while the blade passage vortex and draft tube vortex in the runner gradually develop, and the flow instability increases. The noise sound pressure level shows a decreasing trend with the reduction of load, but there are still significant peaks in specific frequency bands, among which 22 Hz and 100 Hz are respectively related to blade vibration and the operational characteristics of the runner. This study reveals the correlation characteristics between the internal flow and noise of the turbine during the transition process, providing a reference basis for the safe and stable operation of the unit, vibration and noise control, and the optimization of the transition process. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Vibroengineering is the property of Extrica and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Flow characteristics of large-scale Francis turbine during transient processes. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22He%2C+Xiuru%22">He, Xiuru</searchLink><relatesTo>1</relatesTo><i> he_xiuru@ctg.com.cn</i><br /><searchLink fieldCode="AR" term="%22Liao%2C+Xiangbo%22">Liao, Xiangbo</searchLink><relatesTo>1</relatesTo><i> liao_xiangbo@ctg.com.cn</i><br /><searchLink fieldCode="AR" term="%22Luo%2C+Qianlin%22">Luo, Qianlin</searchLink><relatesTo>1</relatesTo><i> luo_qianlin@ctg.com.cn</i><br /><searchLink fieldCode="AR" term="%22Zhao%2C+Wengui%22">Zhao, Wengui</searchLink><relatesTo>1</relatesTo><i> zhao_wengui@ctg.com.cn</i><br /><searchLink fieldCode="AR" term="%22An%2C+Xueli%22">An, Xueli</searchLink><relatesTo>2</relatesTo><i> an_xueli@163.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Vibroengineering%22">Journal of Vibroengineering</searchLink>. May2026, Vol. 28 Issue 3, p705-719. 15p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Francis+turbines%22">Francis turbines</searchLink><br /><searchLink fieldCode="DE" term="%22Transients+%28Dynamics%29%22">Transients (Dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Aeroacoustics%22">Aeroacoustics</searchLink><br /><searchLink fieldCode="DE" term="%22Fluid+dynamics%22">Fluid dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulence%22">Turbulence</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+vibration+research%22">Mechanical vibration research</searchLink><br /><searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: With the continuous establishment and improvement of the new power system, higher requirements have been imposed on the operation of large-scale hydroelectric generating units, which makes the flow inside the turbine more complex. This study employed the computational fluid dynamics (CFD) method based on the SST κ-ω turbulence model to numerically simulate the internal flow field of a large Francis turbine during the load reduction transition process, and coupled an acoustic model to analyze its flow-induced noise. The results show that under a constant head, as the guide vane opening decreases (load reduces), the low-pressure and low-speed zone inside the runner expands from the blade outlet to the inlet, while the blade passage vortex and draft tube vortex in the runner gradually develop, and the flow instability increases. The noise sound pressure level shows a decreasing trend with the reduction of load, but there are still significant peaks in specific frequency bands, among which 22 Hz and 100 Hz are respectively related to blade vibration and the operational characteristics of the runner. This study reveals the correlation characteristics between the internal flow and noise of the turbine during the transition process, providing a reference basis for the safe and stable operation of the unit, vibration and noise control, and the optimization of the transition process. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Vibroengineering is the property of Extrica and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.21595/jve.2026.25385 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 705 Subjects: – SubjectFull: Francis turbines Type: general – SubjectFull: Transients (Dynamics) Type: general – SubjectFull: Aeroacoustics Type: general – SubjectFull: Fluid dynamics Type: general – SubjectFull: Turbulence Type: general – SubjectFull: Mechanical vibration research Type: general – SubjectFull: Computational fluid dynamics Type: general Titles: – TitleFull: Flow characteristics of large-scale Francis turbine during transient processes. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: He, Xiuru – PersonEntity: Name: NameFull: Liao, Xiangbo – PersonEntity: Name: NameFull: Luo, Qianlin – PersonEntity: Name: NameFull: Zhao, Wengui – PersonEntity: Name: NameFull: An, Xueli IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 13928716 Numbering: – Type: volume Value: 28 – Type: issue Value: 3 Titles: – TitleFull: Journal of Vibroengineering Type: main |
| ResultId | 1 |
