Hydrodynamic analysis of one-way energy capture by an oscillating water column wave energy device
This work evaluates the hydrodynamic performance of an oscillating water column wave energy converter, with a focus on comparing conventional two-way energy capture to one-way energy capture where only the up- or down-stroke is used drive the turbine. Small-scale model test experiments are performed...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Energy Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484723004122 |
| _version_ | 1827902698732650496 |
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| author | Bárður Joensen Harry B. Bingham Robert W. Read Kim Nielsen Jokin Brito Trevino |
| author_facet | Bárður Joensen Harry B. Bingham Robert W. Read Kim Nielsen Jokin Brito Trevino |
| author_sort | Bárður Joensen |
| collection | DOAJ |
| description | This work evaluates the hydrodynamic performance of an oscillating water column wave energy converter, with a focus on comparing conventional two-way energy capture to one-way energy capture where only the up- or down-stroke is used drive the turbine. Small-scale model test experiments are performed, and numerical calculations are made using weakly-nonlinear potential flow theory. The air turbine is represented experimentally by an orifice plate with a flow area equal to about 1% of the internal-chamber water-plane area. One-way energy capture by the experimental model is realized by incorporating a passive, low-inertia, non-return valve which vents the air inside the chamber on one half-cycle of the internal water-column oscillation. In the numerical calculations, there is little difference between the two venting configurations, due to the simplified weakly non-linear model. However, the experimental results show that up-stroke venting generally yields a higher power absorption than down-stroke venting and the two-way energy capture generally yields a higher power absorption compared to the one-way energy capture. The calculations agree well with the experiments for two-way absorption, but substantially over-predict the absorbed power in the one-way configuration. This is mainly attributed to the imperfect venting system in the physical model, but further tests and/or CFD calculations are needed to confirm this conclusion. |
| first_indexed | 2024-03-13T00:02:54Z |
| format | Article |
| id | doaj.art-84f5642a2e1a481aa588388de430a4ac |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-03-13T00:02:54Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-84f5642a2e1a481aa588388de430a4ac2023-07-13T05:30:02ZengElsevierEnergy Reports2352-48472023-12-01953065322Hydrodynamic analysis of one-way energy capture by an oscillating water column wave energy deviceBárður Joensen0Harry B. Bingham1Robert W. Read2Kim Nielsen3Jokin Brito Trevino4LBF Consulting Engineers, Niels Finsensgøta 10, FO-110 Tórshavn, Faroe Islands; Technical University of Denmark, Department of Civil and Mechanical Engineering, Section for Fluid Mechanics, Coastal and Maritime Engineering, Nils Koppels Allé, Building 403, 2800 Kgs. Lyngby, Denmark; Corresponding author at: Technical University of Denmark, Department of Civil and Mechanical Engineering, Section for Fluid Mechanics, Coastal and Maritime Engineering, Nils Koppels Allé, Building 403, 2800 Kgs. Lyngby, Denmark.Technical University of Denmark, Department of Civil and Mechanical Engineering, Section for Fluid Mechanics, Coastal and Maritime Engineering, Nils Koppels Allé, Building 403, 2800 Kgs. Lyngby, DenmarkTechnical University of Denmark, Department of Civil and Mechanical Engineering, Section for Fluid Mechanics, Coastal and Maritime Engineering, Nils Koppels Allé, Building 403, 2800 Kgs. Lyngby, DenmarkRambøll A/S, Hanemanns Allé 53, 2300 Copenhagen, DenmarkRambøll A/S, Hanemanns Allé 53, 2300 Copenhagen, DenmarkThis work evaluates the hydrodynamic performance of an oscillating water column wave energy converter, with a focus on comparing conventional two-way energy capture to one-way energy capture where only the up- or down-stroke is used drive the turbine. Small-scale model test experiments are performed, and numerical calculations are made using weakly-nonlinear potential flow theory. The air turbine is represented experimentally by an orifice plate with a flow area equal to about 1% of the internal-chamber water-plane area. One-way energy capture by the experimental model is realized by incorporating a passive, low-inertia, non-return valve which vents the air inside the chamber on one half-cycle of the internal water-column oscillation. In the numerical calculations, there is little difference between the two venting configurations, due to the simplified weakly non-linear model. However, the experimental results show that up-stroke venting generally yields a higher power absorption than down-stroke venting and the two-way energy capture generally yields a higher power absorption compared to the one-way energy capture. The calculations agree well with the experiments for two-way absorption, but substantially over-predict the absorbed power in the one-way configuration. This is mainly attributed to the imperfect venting system in the physical model, but further tests and/or CFD calculations are needed to confirm this conclusion.http://www.sciencedirect.com/science/article/pii/S2352484723004122Wave energy conversionExperimental model testingOscillating water columnValve system |
| spellingShingle | Bárður Joensen Harry B. Bingham Robert W. Read Kim Nielsen Jokin Brito Trevino Hydrodynamic analysis of one-way energy capture by an oscillating water column wave energy device Energy Reports Wave energy conversion Experimental model testing Oscillating water column Valve system |
| title | Hydrodynamic analysis of one-way energy capture by an oscillating water column wave energy device |
| title_full | Hydrodynamic analysis of one-way energy capture by an oscillating water column wave energy device |
| title_fullStr | Hydrodynamic analysis of one-way energy capture by an oscillating water column wave energy device |
| title_full_unstemmed | Hydrodynamic analysis of one-way energy capture by an oscillating water column wave energy device |
| title_short | Hydrodynamic analysis of one-way energy capture by an oscillating water column wave energy device |
| title_sort | hydrodynamic analysis of one way energy capture by an oscillating water column wave energy device |
| topic | Wave energy conversion Experimental model testing Oscillating water column Valve system |
| url | http://www.sciencedirect.com/science/article/pii/S2352484723004122 |
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