Effect of Pitch Angle on Structural and Aerodynamic Characteristics of Vertical-Axis Wind Turbines (VAWTs) Using Leading-Edge Protuberance Blades
An experimental investigation was carried out to understand the effects of LEP (leading-edge protuberance) blades on the structural characteristics of VAWTs. A series of experiments were performed on VAWTs with straight and LEP blades for a wide range of wind velocity (6 m/s to 20 m/s) and pitch ang...
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2025-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/2/286 |
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| author | Karthikvel Elangovan S. Nadaraja Pillai |
| author_facet | Karthikvel Elangovan S. Nadaraja Pillai |
| author_sort | Karthikvel Elangovan |
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| description | An experimental investigation was carried out to understand the effects of LEP (leading-edge protuberance) blades on the structural characteristics of VAWTs. A series of experiments were performed on VAWTs with straight and LEP blades for a wide range of wind velocity (6 m/s to 20 m/s) and pitch angles (−20° to 20°), and the structural excitations on the VAWT structure were measured using a triaxial accelerometer in each case. The raw acceleration data were extensively processed in the time and frequency domains to identify the variation in structural excitation caused by the unsteady wind and aerodynamic loads on the VAWT structure. Understanding the aerodynamic changes and their impact on structural characteristics is essential. The current study examines how LEP influences the structural excitation of VAWTs. However, a great deal of aerodynamic variation was observed for the LEP blades, so the straight blades of the VAWT were replaced with various modified LEP blades, for which a similar set of experiments was carried out. The study presents a better performance (self-starting, stall-mitigating) for VAWTs with LEP 3 and 2 blades, with a significant reduction in the excitation of loads due to wind load and the changes in aerodynamics observed in the along- and across-wind directions. |
| format | Article |
| id | doaj-art-a02bce02be514cf697d60ea75127f349 |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Energies |
| spelling | doaj-art-a02bce02be514cf697d60ea75127f3492025-01-24T13:30:55ZengMDPI AGEnergies1996-10732025-01-0118228610.3390/en18020286Effect of Pitch Angle on Structural and Aerodynamic Characteristics of Vertical-Axis Wind Turbines (VAWTs) Using Leading-Edge Protuberance BladesKarthikvel Elangovan0S. Nadaraja Pillai1Turbulence & Flow Control Laboratory, School of Mechanical Engineering, SASTRA Deemed to Be University, Thanjavur 613041, Tamil Nadu, IndiaTurbulence & Flow Control Laboratory, School of Mechanical Engineering, SASTRA Deemed to Be University, Thanjavur 613041, Tamil Nadu, IndiaAn experimental investigation was carried out to understand the effects of LEP (leading-edge protuberance) blades on the structural characteristics of VAWTs. A series of experiments were performed on VAWTs with straight and LEP blades for a wide range of wind velocity (6 m/s to 20 m/s) and pitch angles (−20° to 20°), and the structural excitations on the VAWT structure were measured using a triaxial accelerometer in each case. The raw acceleration data were extensively processed in the time and frequency domains to identify the variation in structural excitation caused by the unsteady wind and aerodynamic loads on the VAWT structure. Understanding the aerodynamic changes and their impact on structural characteristics is essential. The current study examines how LEP influences the structural excitation of VAWTs. However, a great deal of aerodynamic variation was observed for the LEP blades, so the straight blades of the VAWT were replaced with various modified LEP blades, for which a similar set of experiments was carried out. The study presents a better performance (self-starting, stall-mitigating) for VAWTs with LEP 3 and 2 blades, with a significant reduction in the excitation of loads due to wind load and the changes in aerodynamics observed in the along- and across-wind directions.https://www.mdpi.com/1996-1073/18/2/286dynamic stallVAWT (vertical-axis wind turbine)leading-edge protuberanceenergy reduction indexvibrationpassive flow control |
| spellingShingle | Karthikvel Elangovan S. Nadaraja Pillai Effect of Pitch Angle on Structural and Aerodynamic Characteristics of Vertical-Axis Wind Turbines (VAWTs) Using Leading-Edge Protuberance Blades Energies dynamic stall VAWT (vertical-axis wind turbine) leading-edge protuberance energy reduction index vibration passive flow control |
| title | Effect of Pitch Angle on Structural and Aerodynamic Characteristics of Vertical-Axis Wind Turbines (VAWTs) Using Leading-Edge Protuberance Blades |
| title_full | Effect of Pitch Angle on Structural and Aerodynamic Characteristics of Vertical-Axis Wind Turbines (VAWTs) Using Leading-Edge Protuberance Blades |
| title_fullStr | Effect of Pitch Angle on Structural and Aerodynamic Characteristics of Vertical-Axis Wind Turbines (VAWTs) Using Leading-Edge Protuberance Blades |
| title_full_unstemmed | Effect of Pitch Angle on Structural and Aerodynamic Characteristics of Vertical-Axis Wind Turbines (VAWTs) Using Leading-Edge Protuberance Blades |
| title_short | Effect of Pitch Angle on Structural and Aerodynamic Characteristics of Vertical-Axis Wind Turbines (VAWTs) Using Leading-Edge Protuberance Blades |
| title_sort | effect of pitch angle on structural and aerodynamic characteristics of vertical axis wind turbines vawts using leading edge protuberance blades |
| topic | dynamic stall VAWT (vertical-axis wind turbine) leading-edge protuberance energy reduction index vibration passive flow control |
| url | https://www.mdpi.com/1996-1073/18/2/286 |
| work_keys_str_mv | AT karthikvelelangovan effectofpitchangleonstructuralandaerodynamiccharacteristicsofverticalaxiswindturbinesvawtsusingleadingedgeprotuberanceblades AT snadarajapillai effectofpitchangleonstructuralandaerodynamiccharacteristicsofverticalaxiswindturbinesvawtsusingleadingedgeprotuberanceblades |