Oscillating-Foil Turbine Performance Improvement by the Addition of Double Gurney Flaps and Kinematics Optimization
Refinement of the performance of a fully constrained oscillating-foil turbine is carried out via the addition of passive double Gurney flaps. Flaps ranging from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-03-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/6/2885 |
| _version_ | 1797612061922951168 |
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| author | Benoît Genest Guy Dumas |
| author_facet | Benoît Genest Guy Dumas |
| author_sort | Benoît Genest |
| collection | DOAJ |
| description | Refinement of the performance of a fully constrained oscillating-foil turbine is carried out via the addition of passive double Gurney flaps. Flaps ranging from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>h</mi><mi>GF</mi></msub><mo>=</mo><mn>0.005</mn><mi>c</mi></mrow></semantics></math></inline-formula> to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.075</mn><mi>c</mi></mrow></semantics></math></inline-formula> are added at the trailing edge of the NACA 0015 blade of turbines operating in high-efficiency regimes without leading-edge vortex shedding (LEVS). Performance improvements are determined using 2D numerical simulations with an unsteady Reynolds-averaged Navier–Stokes (URANS) approach. Based on a recent study of the double Gurney flaps on stationary foils, instantaneous power-extraction coefficients are analyzed and modifications of the foil’s kinematics are tested in order to fully benefit from the Gurney flaps’ performance improvements. Modifications to the pivot point location of the foil, to the pitch-heave phase, and to the pitching amplitude of the turbine are considered. Improvements are found for all turbine cases studied, including some of the previously optimal cases reported in the literature. The double Gurney flaps, being a simple and passive device, offer great practical application potential. They represent an efficient refinement to already robust and high-performance oscillating-foil turbines operating without the perceived benefit of leading-edge vortex shedding, an essential characteristic for actual, finite-span applications. |
| first_indexed | 2024-03-11T06:36:55Z |
| format | Article |
| id | doaj.art-7dd6b732c4c746408a726a1c0042e319 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T06:36:55Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-7dd6b732c4c746408a726a1c0042e3192023-11-17T10:52:22ZengMDPI AGEnergies1996-10732023-03-01166288510.3390/en16062885Oscillating-Foil Turbine Performance Improvement by the Addition of Double Gurney Flaps and Kinematics OptimizationBenoît Genest0Guy Dumas1CFD Laboratory LMFN, Department of Mechanical Engineering, Laval University, 1065 Avenue de la Médecine, Québec, QC G1V 0A6, CanadaCFD Laboratory LMFN, Department of Mechanical Engineering, Laval University, 1065 Avenue de la Médecine, Québec, QC G1V 0A6, CanadaRefinement of the performance of a fully constrained oscillating-foil turbine is carried out via the addition of passive double Gurney flaps. Flaps ranging from <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>h</mi><mi>GF</mi></msub><mo>=</mo><mn>0.005</mn><mi>c</mi></mrow></semantics></math></inline-formula> to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.075</mn><mi>c</mi></mrow></semantics></math></inline-formula> are added at the trailing edge of the NACA 0015 blade of turbines operating in high-efficiency regimes without leading-edge vortex shedding (LEVS). Performance improvements are determined using 2D numerical simulations with an unsteady Reynolds-averaged Navier–Stokes (URANS) approach. Based on a recent study of the double Gurney flaps on stationary foils, instantaneous power-extraction coefficients are analyzed and modifications of the foil’s kinematics are tested in order to fully benefit from the Gurney flaps’ performance improvements. Modifications to the pivot point location of the foil, to the pitch-heave phase, and to the pitching amplitude of the turbine are considered. Improvements are found for all turbine cases studied, including some of the previously optimal cases reported in the literature. The double Gurney flaps, being a simple and passive device, offer great practical application potential. They represent an efficient refinement to already robust and high-performance oscillating-foil turbines operating without the perceived benefit of leading-edge vortex shedding, an essential characteristic for actual, finite-span applications.https://www.mdpi.com/1996-1073/16/6/2885oscillating-foil turbineGurney flapCFDURANS |
| spellingShingle | Benoît Genest Guy Dumas Oscillating-Foil Turbine Performance Improvement by the Addition of Double Gurney Flaps and Kinematics Optimization Energies oscillating-foil turbine Gurney flap CFD URANS |
| title | Oscillating-Foil Turbine Performance Improvement by the Addition of Double Gurney Flaps and Kinematics Optimization |
| title_full | Oscillating-Foil Turbine Performance Improvement by the Addition of Double Gurney Flaps and Kinematics Optimization |
| title_fullStr | Oscillating-Foil Turbine Performance Improvement by the Addition of Double Gurney Flaps and Kinematics Optimization |
| title_full_unstemmed | Oscillating-Foil Turbine Performance Improvement by the Addition of Double Gurney Flaps and Kinematics Optimization |
| title_short | Oscillating-Foil Turbine Performance Improvement by the Addition of Double Gurney Flaps and Kinematics Optimization |
| title_sort | oscillating foil turbine performance improvement by the addition of double gurney flaps and kinematics optimization |
| topic | oscillating-foil turbine Gurney flap CFD URANS |
| url | https://www.mdpi.com/1996-1073/16/6/2885 |
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