Performance characterization of a slotted wind turbine airfoil featuring passive blowing
Renewable energy is crucial for a sustainable future, and wind energy holds significant potential as a viable solution to meet global demands. The current study employs high-fidelity Computational Fluid Dynamics (CFD) simulations to investigate the unsteady aerodynamics of an S809 wind turbine airfo...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-06-01
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| Series: | Energy Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484723016207 |
| _version_ | 1827576538012319744 |
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| author | Md. Zishan Akhter Hasan Kamliya Jawahar Farag Khalifa Omar Emad Elnajjar |
| author_facet | Md. Zishan Akhter Hasan Kamliya Jawahar Farag Khalifa Omar Emad Elnajjar |
| author_sort | Md. Zishan Akhter |
| collection | DOAJ |
| description | Renewable energy is crucial for a sustainable future, and wind energy holds significant potential as a viable solution to meet global demands. The current study employs high-fidelity Computational Fluid Dynamics (CFD) simulations to investigate the unsteady aerodynamics of an S809 wind turbine airfoil carved with an inclined contracting curved slot at the mid-chord location. The numerical analyses cover a wide range of angles of attack, α = 0°− 20°, at a chord-based Reynolds number of Rec = 5 × 105. The slotted airfoil exhibits superior aerodynamic performance over moderate-to-high angles of attack (α > 6°), with increased lift, reduced drag, and enhanced glide ratio of up to 1.3×, 0.5×, and 3.7× respectively, compared to the baseline. The slot-induced flow control significantly suppresses flow transition and separation across the airfoil surfaces. The attached-flow regime impedes the formation of flow anomalies, resulting in enhanced aerodynamic performance. Comparative analyses reveal significant reductions in velocity fluctuations, Reynolds shear, vorticity, and turbulent kinetic energy, across the slotted airfoil surface and wake region. The aeroacoustic analysis of the slotted airfoil exhibits substantial reduction in the far-field noise over moderate-high angles of attack, with an overall noise level reduction of approximately 14 decibels recorded at α = 17°. Overall, this study highlights the potential of slot-induced flow control as an effective strategy for enhancing the aerodynamic performance of wind turbines. |
| first_indexed | 2024-03-08T21:12:56Z |
| format | Article |
| id | doaj.art-fdf472be9ba94c268ca9c3169dbb29d8 |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-03-08T21:12:56Z |
| publishDate | 2024-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Energy Reports |
| spelling | doaj.art-fdf472be9ba94c268ca9c3169dbb29d82023-12-22T05:33:25ZengElsevierEnergy Reports2352-48472024-06-0111720735Performance characterization of a slotted wind turbine airfoil featuring passive blowingMd. Zishan Akhter0Hasan Kamliya Jawahar1Farag Khalifa Omar2Emad Elnajjar3Department of Mechanical & Aerospace Engineering, United Arab Emirates University, United Arab EmiratesDepartment of Mechanical Engineering, University of Bristol, United Kingdom,Department of Mechanical & Aerospace Engineering, United Arab Emirates University, United Arab Emirates; Corresponding author.Department of Mechanical & Aerospace Engineering, United Arab Emirates University, United Arab EmiratesRenewable energy is crucial for a sustainable future, and wind energy holds significant potential as a viable solution to meet global demands. The current study employs high-fidelity Computational Fluid Dynamics (CFD) simulations to investigate the unsteady aerodynamics of an S809 wind turbine airfoil carved with an inclined contracting curved slot at the mid-chord location. The numerical analyses cover a wide range of angles of attack, α = 0°− 20°, at a chord-based Reynolds number of Rec = 5 × 105. The slotted airfoil exhibits superior aerodynamic performance over moderate-to-high angles of attack (α > 6°), with increased lift, reduced drag, and enhanced glide ratio of up to 1.3×, 0.5×, and 3.7× respectively, compared to the baseline. The slot-induced flow control significantly suppresses flow transition and separation across the airfoil surfaces. The attached-flow regime impedes the formation of flow anomalies, resulting in enhanced aerodynamic performance. Comparative analyses reveal significant reductions in velocity fluctuations, Reynolds shear, vorticity, and turbulent kinetic energy, across the slotted airfoil surface and wake region. The aeroacoustic analysis of the slotted airfoil exhibits substantial reduction in the far-field noise over moderate-high angles of attack, with an overall noise level reduction of approximately 14 decibels recorded at α = 17°. Overall, this study highlights the potential of slot-induced flow control as an effective strategy for enhancing the aerodynamic performance of wind turbines.http://www.sciencedirect.com/science/article/pii/S2352484723016207Flow-controlReynolds shearTurbulent kinetic energyStrain rateFar-field noise |
| spellingShingle | Md. Zishan Akhter Hasan Kamliya Jawahar Farag Khalifa Omar Emad Elnajjar Performance characterization of a slotted wind turbine airfoil featuring passive blowing Energy Reports Flow-control Reynolds shear Turbulent kinetic energy Strain rate Far-field noise |
| title | Performance characterization of a slotted wind turbine airfoil featuring passive blowing |
| title_full | Performance characterization of a slotted wind turbine airfoil featuring passive blowing |
| title_fullStr | Performance characterization of a slotted wind turbine airfoil featuring passive blowing |
| title_full_unstemmed | Performance characterization of a slotted wind turbine airfoil featuring passive blowing |
| title_short | Performance characterization of a slotted wind turbine airfoil featuring passive blowing |
| title_sort | performance characterization of a slotted wind turbine airfoil featuring passive blowing |
| topic | Flow-control Reynolds shear Turbulent kinetic energy Strain rate Far-field noise |
| url | http://www.sciencedirect.com/science/article/pii/S2352484723016207 |
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