Enhanced energy extraction in small-scale wind turbines through slot-based passive blowing
The increasing demand for sustainable energy has spurred research and development of wind turbines. In this study, a passive flow-control technique using a non-uniform curved slot is proposed. The slot is engraved on the mid-chord region of the National Renewable Energy Laboratory (NREL) Phase VI wi...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/173642 |
| _version_ | 1824456700574302208 |
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| author | Akhter, Md. Zishan Ali, Ahmed Riyadh Jawahar, Hasan Kamliya Omar, Farag Khalifa Elnajjar, Emad |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Akhter, Md. Zishan Ali, Ahmed Riyadh Jawahar, Hasan Kamliya Omar, Farag Khalifa Elnajjar, Emad |
| author_sort | Akhter, Md. Zishan |
| collection | NTU |
| description | The increasing demand for sustainable energy has spurred research and development of wind turbines. In this study, a passive flow-control technique using a non-uniform curved slot is proposed. The slot is engraved on the mid-chord region of the National Renewable Energy Laboratory (NREL) Phase VI wind turbine blade, between the quarter-span and tip radial stations. The impact of slot-induced flow control is investigated using three-dimensional transient computational fluid dynamics (CFD) modeling across a range of wind speeds, including pre-stall and deep-stall conditions. Aerodynamic analyses are performed to ascertain the influence of slot-flow on the complex three-dimensional flow dynamics around the blade. The slotted blade demonstrates significant improvements in low-speed shaft torque and power compared to the baseline blade. Additionally, the slotted blade experiences increment in the inherent thrust and flapwise bending moments. Detailed wake flow field and surface flow visualization indicate that the slot promotes a more streamlined attached flow across the blade span, delaying flow transition and suppressing turbulence on the blade surface and downstream wake. The slot-flow also reduces radial flow and tip-vorticity anomalies along the blade. Overall, flow control enhancement achieved by the slotted blade significantly boosts the annual energy production of the wind turbine. |
| first_indexed | 2025-02-19T03:58:16Z |
| format | Journal Article |
| id | ntu-10356/173642 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:58:16Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1736422024-02-24T16:48:19Z Enhanced energy extraction in small-scale wind turbines through slot-based passive blowing Akhter, Md. Zishan Ali, Ahmed Riyadh Jawahar, Hasan Kamliya Omar, Farag Khalifa Elnajjar, Emad School of Mechanical and Aerospace Engineering Engineering Flow control Turbulent kinetic energy The increasing demand for sustainable energy has spurred research and development of wind turbines. In this study, a passive flow-control technique using a non-uniform curved slot is proposed. The slot is engraved on the mid-chord region of the National Renewable Energy Laboratory (NREL) Phase VI wind turbine blade, between the quarter-span and tip radial stations. The impact of slot-induced flow control is investigated using three-dimensional transient computational fluid dynamics (CFD) modeling across a range of wind speeds, including pre-stall and deep-stall conditions. Aerodynamic analyses are performed to ascertain the influence of slot-flow on the complex three-dimensional flow dynamics around the blade. The slotted blade demonstrates significant improvements in low-speed shaft torque and power compared to the baseline blade. Additionally, the slotted blade experiences increment in the inherent thrust and flapwise bending moments. Detailed wake flow field and surface flow visualization indicate that the slot promotes a more streamlined attached flow across the blade span, delaying flow transition and suppressing turbulence on the blade surface and downstream wake. The slot-flow also reduces radial flow and tip-vorticity anomalies along the blade. Overall, flow control enhancement achieved by the slotted blade significantly boosts the annual energy production of the wind turbine. Published version 2024-02-20T07:31:25Z 2024-02-20T07:31:25Z 2023 Journal Article Akhter, M. Z., Ali, A. R., Jawahar, H. K., Omar, F. K. & Elnajjar, E. (2023). Enhanced energy extraction in small-scale wind turbines through slot-based passive blowing. Energy Conversion and Management: X, 19, 100400-. https://dx.doi.org/10.1016/j.ecmx.2023.100400 2590-1745 https://hdl.handle.net/10356/173642 10.1016/j.ecmx.2023.100400 2-s2.0-85161673022 19 100400 en Energy Conversion and Management: X © 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/). application/pdf |
| spellingShingle | Engineering Flow control Turbulent kinetic energy Akhter, Md. Zishan Ali, Ahmed Riyadh Jawahar, Hasan Kamliya Omar, Farag Khalifa Elnajjar, Emad Enhanced energy extraction in small-scale wind turbines through slot-based passive blowing |
| title | Enhanced energy extraction in small-scale wind turbines through slot-based passive blowing |
| title_full | Enhanced energy extraction in small-scale wind turbines through slot-based passive blowing |
| title_fullStr | Enhanced energy extraction in small-scale wind turbines through slot-based passive blowing |
| title_full_unstemmed | Enhanced energy extraction in small-scale wind turbines through slot-based passive blowing |
| title_short | Enhanced energy extraction in small-scale wind turbines through slot-based passive blowing |
| title_sort | enhanced energy extraction in small scale wind turbines through slot based passive blowing |
| topic | Engineering Flow control Turbulent kinetic energy |
| url | https://hdl.handle.net/10356/173642 |
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