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Experimental investigation of mini Gurney flaps in combination with vortex generators for improved wind turbine blade performance

Jörg Alber, Marinos Manolesos Orcid Logo, Guido Weinzierl-Dlugosch, Johannes Fischer, Alexander Schönmeier, Christian Navid Nayeri, Christian Oliver Paschereit, Joachim Twele, Jens Fortmann Orcid Logo, Pier Francesco Melani, Alessandro Bianchini Orcid Logo

Wind Energy Science, Volume: 7, Issue: 3, Pages: 943 - 965

Swansea University Author: Marinos Manolesos Orcid Logo

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DOI (Published version): 10.5194/wes-7-943-2022

Abstract

This wind tunnel study investigates the aerodynamic effects of mini Gurney flaps (MGFs) and their combination with vortex generators (VGs) on the performance of airfoils and wind turbine rotor blades. VGs are installed on the suction side aiming at stall delay and increased maximum lift. MGFs are th...

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Published in: Wind Energy Science
ISSN: 2366-7451
Published: Copernicus GmbH 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa60343
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MGFs are thin angle profiles that are attached at the trailing edge in order to increase lift at pre-stall operation. The implementation of both these passive flow control devices is accompanied by a certain drag penalty. The wind tunnel tests are conducted at the Hermann-F&#xF6;ttinger Institut of the Technische Universit&#xE4;t Berlin based on two airfoils that are characteristic of different sections of large rotor blades. Lift and drag are determined using a force balance and a wake rake, respectively, for static angles of attack between &#x2212;5 and 17&#x2218; at a Reynolds number of 1.5 million. The impact of different MGF heights including 0.25&#x2009;%, 0.5&#x2009;% and 1.0&#x2009;% and a VG height of 1.1&#x2009;% of the chord length is tested and evaluated. Furthermore, the clean and the tripped baseline cases are considered. In the latter, leading-edge transition is forced with Zig Zag (ZZ) turbulator tape. The preferred configurations are the smallest MGF on the NACA63(3)618 and the medium-sized MGF combined with VGs on the DU97W300. Next, the experimental lift and drag polar data are imported into the software QBlade in order to design a generic rotor blade. The blade performance is simulated with and without the add-ons by means of two case studies. In the first case, the retrofit application on an existing blade mitigates the adverse effects of the ZZ tape. Stall is delayed and the aerodynamic efficiency is partly recovered leading to an improvement of the power curve. In the second case, the new design application allows for the design of a more slender blade while maintaining the rotor power. 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spelling 2022-07-13T15:44:52.4635092 v2 60343 2022-07-01 Experimental investigation of mini Gurney flaps in combination with vortex generators for improved wind turbine blade performance 44a3e0d351ccd7a8365d5fc7c50c8778 0000-0002-5506-6061 Marinos Manolesos Marinos Manolesos true false 2022-07-01 ACEM This wind tunnel study investigates the aerodynamic effects of mini Gurney flaps (MGFs) and their combination with vortex generators (VGs) on the performance of airfoils and wind turbine rotor blades. VGs are installed on the suction side aiming at stall delay and increased maximum lift. MGFs are thin angle profiles that are attached at the trailing edge in order to increase lift at pre-stall operation. The implementation of both these passive flow control devices is accompanied by a certain drag penalty. The wind tunnel tests are conducted at the Hermann-Föttinger Institut of the Technische Universität Berlin based on two airfoils that are characteristic of different sections of large rotor blades. Lift and drag are determined using a force balance and a wake rake, respectively, for static angles of attack between −5 and 17∘ at a Reynolds number of 1.5 million. The impact of different MGF heights including 0.25 %, 0.5 % and 1.0 % and a VG height of 1.1 % of the chord length is tested and evaluated. Furthermore, the clean and the tripped baseline cases are considered. In the latter, leading-edge transition is forced with Zig Zag (ZZ) turbulator tape. The preferred configurations are the smallest MGF on the NACA63(3)618 and the medium-sized MGF combined with VGs on the DU97W300. Next, the experimental lift and drag polar data are imported into the software QBlade in order to design a generic rotor blade. The blade performance is simulated with and without the add-ons by means of two case studies. In the first case, the retrofit application on an existing blade mitigates the adverse effects of the ZZ tape. Stall is delayed and the aerodynamic efficiency is partly recovered leading to an improvement of the power curve. In the second case, the new design application allows for the design of a more slender blade while maintaining the rotor power. This alternative blade appears to be more resistant against the adverse effects of forced leading-edge transition. Journal Article Wind Energy Science 7 3 943 965 Copernicus GmbH 2366-7451 3 5 2022 2022-05-03 10.5194/wes-7-943-2022 Data availability:Measurement data and results can be provided by contacting the corresponding author. COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2022-07-13T15:44:52.4635092 2022-07-01T08:57:59.5390696 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Jörg Alber 1 Marinos Manolesos 0000-0002-5506-6061 2 Guido Weinzierl-Dlugosch 3 Johannes Fischer 4 Alexander Schönmeier 5 Christian Navid Nayeri 6 Christian Oliver Paschereit 7 Joachim Twele 8 Jens Fortmann 0000-0002-0189-3483 9 Pier Francesco Melani 10 Alessandro Bianchini 0000-0002-8042-5863 11 60343__24582__e33eae1deaa94556841b82adbeab79ec.pdf 60343.pdf 2022-07-13T15:43:07.5078464 Output 8039112 application/pdf Version of Record true © Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License true eng https://creativecommons.org/licenses/by/4.0/
title Experimental investigation of mini Gurney flaps in combination with vortex generators for improved wind turbine blade performance
spellingShingle Experimental investigation of mini Gurney flaps in combination with vortex generators for improved wind turbine blade performance
Marinos Manolesos
title_short Experimental investigation of mini Gurney flaps in combination with vortex generators for improved wind turbine blade performance
title_full Experimental investigation of mini Gurney flaps in combination with vortex generators for improved wind turbine blade performance
title_fullStr Experimental investigation of mini Gurney flaps in combination with vortex generators for improved wind turbine blade performance
title_full_unstemmed Experimental investigation of mini Gurney flaps in combination with vortex generators for improved wind turbine blade performance
title_sort Experimental investigation of mini Gurney flaps in combination with vortex generators for improved wind turbine blade performance
author_id_str_mv 44a3e0d351ccd7a8365d5fc7c50c8778
author_id_fullname_str_mv 44a3e0d351ccd7a8365d5fc7c50c8778_***_Marinos Manolesos
author Marinos Manolesos
author2 Jörg Alber
Marinos Manolesos
Guido Weinzierl-Dlugosch
Johannes Fischer
Alexander Schönmeier
Christian Navid Nayeri
Christian Oliver Paschereit
Joachim Twele
Jens Fortmann
Pier Francesco Melani
Alessandro Bianchini
format Journal article
container_title Wind Energy Science
container_volume 7
container_issue 3
container_start_page 943
publishDate 2022
institution Swansea University
issn 2366-7451
doi_str_mv 10.5194/wes-7-943-2022
publisher Copernicus GmbH
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description This wind tunnel study investigates the aerodynamic effects of mini Gurney flaps (MGFs) and their combination with vortex generators (VGs) on the performance of airfoils and wind turbine rotor blades. VGs are installed on the suction side aiming at stall delay and increased maximum lift. MGFs are thin angle profiles that are attached at the trailing edge in order to increase lift at pre-stall operation. The implementation of both these passive flow control devices is accompanied by a certain drag penalty. The wind tunnel tests are conducted at the Hermann-Föttinger Institut of the Technische Universität Berlin based on two airfoils that are characteristic of different sections of large rotor blades. Lift and drag are determined using a force balance and a wake rake, respectively, for static angles of attack between −5 and 17∘ at a Reynolds number of 1.5 million. The impact of different MGF heights including 0.25 %, 0.5 % and 1.0 % and a VG height of 1.1 % of the chord length is tested and evaluated. Furthermore, the clean and the tripped baseline cases are considered. In the latter, leading-edge transition is forced with Zig Zag (ZZ) turbulator tape. The preferred configurations are the smallest MGF on the NACA63(3)618 and the medium-sized MGF combined with VGs on the DU97W300. Next, the experimental lift and drag polar data are imported into the software QBlade in order to design a generic rotor blade. The blade performance is simulated with and without the add-ons by means of two case studies. In the first case, the retrofit application on an existing blade mitigates the adverse effects of the ZZ tape. Stall is delayed and the aerodynamic efficiency is partly recovered leading to an improvement of the power curve. In the second case, the new design application allows for the design of a more slender blade while maintaining the rotor power. This alternative blade appears to be more resistant against the adverse effects of forced leading-edge transition.
published_date 2022-05-03T08:07:45Z
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score 11.047328

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