Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy Converter
A cross-flow air turbine, which is a self-rectifying, air-driven turbine, was designed and proposed for the power take-off (PTO) system of an oscillating water column (OWC) wave energy converter (WEC). To predict the complicated non-linear behavior of the air turbine in the OWC, numerical and experi...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/7/2444 |
| _version_ | 1797439561476866048 |
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| author | Hong-Goo Kang Young-Ho Lee Chan-Joo Kim Hyo-Dong Kang |
| author_facet | Hong-Goo Kang Young-Ho Lee Chan-Joo Kim Hyo-Dong Kang |
| author_sort | Hong-Goo Kang |
| collection | DOAJ |
| description | A cross-flow air turbine, which is a self-rectifying, air-driven turbine, was designed and proposed for the power take-off (PTO) system of an oscillating water column (OWC) wave energy converter (WEC). To predict the complicated non-linear behavior of the air turbine in the OWC, numerical and experimental investigations were accomplished. The geometries of the nozzle and the rotor of the turbine were optimized under steady-flow conditions, and the performance analysis of the model in bi-directional flows was conducted by commercial computational fluid dynamics (CFD) code ANSYS CFX. Experimentation on the full-scale turbine was then undertaken in a cylindrical-type wave simulator that generated reciprocating air flows, to validate the numerical model. The optimized model had a peak cycle-averaged efficiency of 0.611, which is 1.7% larger than that of the reference model, and a significantly improved band width with an increase in flow coefficients. Under reciprocating-flow conditions, the optimized model had a more improved operating range with high efficiency compared to the performance derived from the steady-flow analysis, but the peak cycle-averaged efficiency was decreased by 4.3%. The numerical model was well matched to the experimental results with an averaged difference of 3.5%. The proposed optimal design having structural simplicity with high performance can be a good option to efficiently generate electricity. |
| first_indexed | 2024-03-09T11:55:50Z |
| format | Article |
| id | doaj.art-b10fdab2ca294d13bd1a2dbc941e77f6 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T11:55:50Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-b10fdab2ca294d13bd1a2dbc941e77f62023-11-30T23:10:16ZengMDPI AGEnergies1996-10732022-03-01157244410.3390/en15072444Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy ConverterHong-Goo Kang0Young-Ho Lee1Chan-Joo Kim2Hyo-Dong Kang3Department of Mechanical Engineering, Graduate School, Korea Maritime and Ocean University, Busan 49122, KoreaDivision of Mechanical Engineering, College of Engineering, Korea Maritime and Ocean University, Busan 49122, KoreaResearch and Development Center, Foresys Co., Ltd., Seoul 04048, KoreaResearch and Development Center, Foresys Co., Ltd., Seoul 04048, KoreaA cross-flow air turbine, which is a self-rectifying, air-driven turbine, was designed and proposed for the power take-off (PTO) system of an oscillating water column (OWC) wave energy converter (WEC). To predict the complicated non-linear behavior of the air turbine in the OWC, numerical and experimental investigations were accomplished. The geometries of the nozzle and the rotor of the turbine were optimized under steady-flow conditions, and the performance analysis of the model in bi-directional flows was conducted by commercial computational fluid dynamics (CFD) code ANSYS CFX. Experimentation on the full-scale turbine was then undertaken in a cylindrical-type wave simulator that generated reciprocating air flows, to validate the numerical model. The optimized model had a peak cycle-averaged efficiency of 0.611, which is 1.7% larger than that of the reference model, and a significantly improved band width with an increase in flow coefficients. Under reciprocating-flow conditions, the optimized model had a more improved operating range with high efficiency compared to the performance derived from the steady-flow analysis, but the peak cycle-averaged efficiency was decreased by 4.3%. The numerical model was well matched to the experimental results with an averaged difference of 3.5%. The proposed optimal design having structural simplicity with high performance can be a good option to efficiently generate electricity.https://www.mdpi.com/1996-1073/15/7/2444wave energy converteroscillating water column (OWC)cross-flow air turbinecomputational fluid dynamics (CFD) |
| spellingShingle | Hong-Goo Kang Young-Ho Lee Chan-Joo Kim Hyo-Dong Kang Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy Converter Energies wave energy converter oscillating water column (OWC) cross-flow air turbine computational fluid dynamics (CFD) |
| title | Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy Converter |
| title_full | Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy Converter |
| title_fullStr | Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy Converter |
| title_full_unstemmed | Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy Converter |
| title_short | Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy Converter |
| title_sort | design optimization of a cross flow air turbine for an oscillating water column wave energy converter |
| topic | wave energy converter oscillating water column (OWC) cross-flow air turbine computational fluid dynamics (CFD) |
| url | https://www.mdpi.com/1996-1073/15/7/2444 |
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