Segmented Gurney Flaps for Improved Wind Turbine Wake Recovery.
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| Title: | Segmented Gurney Flaps for Improved Wind Turbine Wake Recovery. |
|---|---|
| Authors: | Dangi, Nirav1,2 (AUTHOR), Boorsma, Koen1 (AUTHOR) koen.boorsma@tno.nl, Bot, Edwin1 (AUTHOR), Bierbooms, Wim2 (AUTHOR), Yu, Wei2 (AUTHOR) |
| Source: | Wind Energy. Mar2026, Vol. 29 Issue 3, p1-18. 18p. |
| Subjects: | Vortex generators, Wind turbine efficiency, Vortex motion, Wind power, Turbulence |
| Abstract: | When wind passes through the rotor of a wind turbine, the velocity is decreased while turbulence is increased. The region of decreased wind speed behind the rotor is known as the wind turbine wake and is bounded by a complex structure of helical vortices. This structure occurs to be more stable in low ambient turbulence and low tip speed ratio conditions, leading to a delayed recovery of the wake. The diminished wind speed in the wake leads to a decline in power output for downstream wind turbines, with this loss scaling proportionally to the cube of the velocity. This study uses field tests and simulations to evaluate enhanced wake recovery with segmented Gurney flaps on a 3.8‐MW research wind turbine. Four Gurney flaps were attached at regions near the tip of each blade. This configuration is hypothesized to induce turbulence that destabilizes the vortex system, resulting in faster wake recovery. Field tests using a scanning LiDAR were conducted to quantify the wind turbine wake recovery between the baseline and the retrofitted configuration in various atmospheric conditions. The results show a consistent increase in wake recovery for the Gurney flap configuration, generally at all downstream distances. This was illustrated by a reduction of axial velocity deficits of roughly 10% at hub height, at five diameters downstream distance. The influence of retrofitting on turbine power and loads was limited. Summarizing, a very successful field test campaign was executed, which demonstrated the use of segmented Gurney flaps as a promising add‐on to promote enhanced wind turbine wake recovery for improved overall wind farm performance. [ABSTRACT FROM AUTHOR] |
| Copyright of Wind Energy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 191728326 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Segmented Gurney Flaps for Improved Wind Turbine Wake Recovery. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Dangi%2C+Nirav%22">Dangi, Nirav</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Boorsma%2C+Koen%22">Boorsma, Koen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> koen.boorsma@tno.nl</i><br /><searchLink fieldCode="AR" term="%22Bot%2C+Edwin%22">Bot, Edwin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bierbooms%2C+Wim%22">Bierbooms, Wim</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yu%2C+Wei%22">Yu, Wei</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Wind+Energy%22">Wind Energy</searchLink>. Mar2026, Vol. 29 Issue 3, p1-18. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Vortex+generators%22">Vortex generators</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+turbine+efficiency%22">Wind turbine efficiency</searchLink><br /><searchLink fieldCode="DE" term="%22Vortex+motion%22">Vortex motion</searchLink><br /><searchLink fieldCode="DE" term="%22Wind+power%22">Wind power</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulence%22">Turbulence</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: When wind passes through the rotor of a wind turbine, the velocity is decreased while turbulence is increased. The region of decreased wind speed behind the rotor is known as the wind turbine wake and is bounded by a complex structure of helical vortices. This structure occurs to be more stable in low ambient turbulence and low tip speed ratio conditions, leading to a delayed recovery of the wake. The diminished wind speed in the wake leads to a decline in power output for downstream wind turbines, with this loss scaling proportionally to the cube of the velocity. This study uses field tests and simulations to evaluate enhanced wake recovery with segmented Gurney flaps on a 3.8‐MW research wind turbine. Four Gurney flaps were attached at regions near the tip of each blade. This configuration is hypothesized to induce turbulence that destabilizes the vortex system, resulting in faster wake recovery. Field tests using a scanning LiDAR were conducted to quantify the wind turbine wake recovery between the baseline and the retrofitted configuration in various atmospheric conditions. The results show a consistent increase in wake recovery for the Gurney flap configuration, generally at all downstream distances. This was illustrated by a reduction of axial velocity deficits of roughly 10% at hub height, at five diameters downstream distance. The influence of retrofitting on turbine power and loads was limited. Summarizing, a very successful field test campaign was executed, which demonstrated the use of segmented Gurney flaps as a promising add‐on to promote enhanced wind turbine wake recovery for improved overall wind farm performance. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Wind Energy is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/we.70096 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 1 Subjects: – SubjectFull: Vortex generators Type: general – SubjectFull: Wind turbine efficiency Type: general – SubjectFull: Vortex motion Type: general – SubjectFull: Wind power Type: general – SubjectFull: Turbulence Type: general Titles: – TitleFull: Segmented Gurney Flaps for Improved Wind Turbine Wake Recovery. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Dangi, Nirav – PersonEntity: Name: NameFull: Boorsma, Koen – PersonEntity: Name: NameFull: Bot, Edwin – PersonEntity: Name: NameFull: Bierbooms, Wim – PersonEntity: Name: NameFull: Yu, Wei IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 10954244 Numbering: – Type: volume Value: 29 – Type: issue Value: 3 Titles: – TitleFull: Wind Energy Type: main |
| ResultId | 1 |
