An experimental study on flow induced motion and energy harvesting of cylinders with different cross sections
It has been known that the cross-sectional shape of a column oscillator significantly influences its vibrational characteristics and energy conversion capacity, and can alter the nature of flow-excited vibration (FIV). Whether the addition of appendages to oscillators with different cross-sectional...
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Frontiers Media S.A.
2024-12-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2024.1461020/full |
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| author | Ronglai Song Peng Xu Peng Xu Changqing Jiang Yuan Zhang Yuan Zhang He Li He Li |
| author_facet | Ronglai Song Peng Xu Peng Xu Changqing Jiang Yuan Zhang Yuan Zhang He Li He Li |
| author_sort | Ronglai Song |
| collection | DOAJ |
| description | It has been known that the cross-sectional shape of a column oscillator significantly influences its vibrational characteristics and energy conversion capacity, and can alter the nature of flow-excited vibration (FIV). Whether the addition of appendages to oscillators with different cross-sectional shapes enhances energy conversion capacity remains uncertain. In this study, the vibration characteristics and energy capture capabilities of an elastically supported oscillator with a semicircular appendage, suitable for low-speed seafloor current environments, are investigated. Experiments were conducted at zero degrees incidence for Reynolds numbers ranging from 5.041 × 10³ to 7.562 × 104, resulting in turbulent wake conditions. The hydrodynamic properties of the oscillators were evaluated through statistical analysis, Proper Orthogonal Decomposition (POD), and vortex core identification of Particle Image Velocimetry (PIV) fields. The energy capture capability of the oscillator was assessed through statistical analysis of its vibration displacement, frequency, and amplitude. The study's results indicate that an oscillator with symmetric sharp attachments and without vortex reattachment is favorable for galloping with self-excitation. Under equivalent conditions, the Circular-T-shaped oscillator demonstrates superior energy conversion capacity compared to existing models, with the galloping branch being the most efficient for energy conversion; the peak efficiency is 24.5% (Ur = 14.5). This study provides some baseline data and optimization solutions for flow-induced motion power generation. |
| format | Article |
| id | doaj-art-434ad2e6ee5f4993bf1e18b31df3cbb3 |
| institution | DOAJ |
| issn | 2296-7745 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj-art-434ad2e6ee5f4993bf1e18b31df3cbb32025-08-20T02:50:56ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452024-12-011110.3389/fmars.2024.14610201461020An experimental study on flow induced motion and energy harvesting of cylinders with different cross sectionsRonglai Song0Peng Xu1Peng Xu2Changqing Jiang3Yuan Zhang4Yuan Zhang5He Li6He Li7School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan, ChinaSchool of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan, ChinaSchool of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai, ChinaInstitute of Sustainable and Autonomous Maritime Systems, University of Duisburg-Essen, Duisburg, GermanySchool of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan, ChinaCollege of Mechanical and Marine Engineering, Beibu Gulf University, Qinzhou, ChinaSchool of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan, ChinaCollege of Mechanical and Marine Engineering, Beibu Gulf University, Qinzhou, ChinaIt has been known that the cross-sectional shape of a column oscillator significantly influences its vibrational characteristics and energy conversion capacity, and can alter the nature of flow-excited vibration (FIV). Whether the addition of appendages to oscillators with different cross-sectional shapes enhances energy conversion capacity remains uncertain. In this study, the vibration characteristics and energy capture capabilities of an elastically supported oscillator with a semicircular appendage, suitable for low-speed seafloor current environments, are investigated. Experiments were conducted at zero degrees incidence for Reynolds numbers ranging from 5.041 × 10³ to 7.562 × 104, resulting in turbulent wake conditions. The hydrodynamic properties of the oscillators were evaluated through statistical analysis, Proper Orthogonal Decomposition (POD), and vortex core identification of Particle Image Velocimetry (PIV) fields. The energy capture capability of the oscillator was assessed through statistical analysis of its vibration displacement, frequency, and amplitude. The study's results indicate that an oscillator with symmetric sharp attachments and without vortex reattachment is favorable for galloping with self-excitation. Under equivalent conditions, the Circular-T-shaped oscillator demonstrates superior energy conversion capacity compared to existing models, with the galloping branch being the most efficient for energy conversion; the peak efficiency is 24.5% (Ur = 14.5). This study provides some baseline data and optimization solutions for flow-induced motion power generation.https://www.frontiersin.org/articles/10.3389/fmars.2024.1461020/fullflow-induced vibrationnon-circular cylindersparticle image velocimetry (PIV)proper orthogonal decomposition (POD)conversion efficiency |
| spellingShingle | Ronglai Song Peng Xu Peng Xu Changqing Jiang Yuan Zhang Yuan Zhang He Li He Li An experimental study on flow induced motion and energy harvesting of cylinders with different cross sections Frontiers in Marine Science flow-induced vibration non-circular cylinders particle image velocimetry (PIV) proper orthogonal decomposition (POD) conversion efficiency |
| title | An experimental study on flow induced motion and energy harvesting of cylinders with different cross sections |
| title_full | An experimental study on flow induced motion and energy harvesting of cylinders with different cross sections |
| title_fullStr | An experimental study on flow induced motion and energy harvesting of cylinders with different cross sections |
| title_full_unstemmed | An experimental study on flow induced motion and energy harvesting of cylinders with different cross sections |
| title_short | An experimental study on flow induced motion and energy harvesting of cylinders with different cross sections |
| title_sort | experimental study on flow induced motion and energy harvesting of cylinders with different cross sections |
| topic | flow-induced vibration non-circular cylinders particle image velocimetry (PIV) proper orthogonal decomposition (POD) conversion efficiency |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2024.1461020/full |
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