An experimental study on the effects of winglets on the tip vortex interaction in the near wake of a model wind turbine

Bartl, Jan; Mühle, Franz; Hansen, Thomas; Adaramola, Muyiwa S.; Sætran, Lars Roar

doi:10.1002/we.2486

Cited by 22 publications

(13 citation statements)

References 23 publications

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“…While some of the works mentioned below are indeed experimental, the focus is on numerical studies given that the present work is purely numerical. A literature survey including further experimental studies is presented by Mühle et al (2020).…”

Section: Literature Reviewmentioning

confidence: 99%

CFD-based curved tip shape design for wind turbine blades

Madsen¹,

Zahle²,

Horcas³

et al. 2022

Wind Energ. Sci.

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Abstract. This work presents a high-fidelity shape optimization framework based on computational fluid dynamics (CFD). The presented work is the first comprehensive curved tip shape study of a wind turbine rotor to date using a direct CFD-based approach. Preceding the study is a thorough literature survey particularly focused on wind turbine blade tips in order to place the present work in its context. Then follows a comprehensive analysis to quantify mesh dependency and to present needed mesh modifications ensuring a deep convergence of the flow field at each design iteration. The presented modifications allow the framework to produce up to six-digit-accurate finite difference gradients which are verified using the machine-accurate Complex-Step method. The accurate gradients result in a tightly converged design optimization problem in which the studied problem is to maximize power using 12 design variables while satisfying constraints on geometry, as well as on the bending moment at 90 % blade length. The optimized shape has about 1 % r/R blade extension, 2 % r/R flapwise displacement, and slightly below 2 % r/R edgewise displacement resulting in a 1.12 % increase in power. Importantly, the inboard part of the tip is de-loaded using twist and chord design variables as the blade is extended, ensuring that the baseline steady-state loads are not exceeded. For both analysis and optimization an industrial-scale mesh resolution of above 14×106 cells is used, which underlines the maturity of the framework.

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Section: Literature Reviewmentioning

confidence: 99%

CFD-based curved tip shape design for wind turbine blades

Madsen¹,

Zahle²,

Horcas³

et al. 2022

Wind Energ. Sci.

View full text Add to dashboard Cite

show abstract

“…While some of the works mentioned below are indeed experimental, the focus is on numerical studies given that also the present work is purely numerical. A literature survey including further experimental studies is presented by Mühle et al (2020).…”

Section: Literature Reviewmentioning

confidence: 99%

“…However, also thrust increases with 0.83% and 2.05% percent for the designs in question. Mühle et al (2020) investigate the promise of using winglets to enhance wake recovery using an experimental setup. These types of studies view a wind turbine not only as an isolated system but also as part of a whole, e.g., a wind farm.…”

Section: Parametric Studiesmentioning

confidence: 99%

CFD-based curved tip shape design for wind turbine blades

Madsen¹,

Zahle²,

Horcas³

et al. 2021

Preprint

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Abstract. This work presents a high-fidelity shape optimization framework based on computational fluid dynamics (CFD). The presented work is the first comprehensive curved tip shape study of a wind turbine rotor to date using a direct CFD-based approach. Preceeding the study is a thorough literature survey particularly focused on wind turbine blade tips in order to place the present work in its context. Then follows a comprehensive analysis to quantify mesh dependency and to present needed mesh modifications ensuring a deep convergence of the flow field at each design iteration. The presented modifications allow the framework to produce up to 6 digit accurate finite difference gradients which are verified using the machine accurate Complex-Step method. The accurate gradients result in a tightly converged design optimization problem where the studied problem is to maximize power using 12 design variables while satisfying constraints on geometry as well as on the bending moment at 90 % blade length. The optimized shape has about 1 % r/R blade extension, 2 % r/R flapwise displacement, and slightly below 2 % r/R edgewise displacement resulting in a 1.12 % increase in power. Importantly, the inboard part of the tip is de-loaded using twist and chord design variables as the blade is extended ensuring that the baseline steady-state loads are not exceeded. For both analysis and optimization an industrial scale mesh resolution of above 14 · 106 cells is used which underlines the maturity of the framework.

show abstract

“…-noise reduction (Lissaman and Gyatt, 1985;Madsen and Fuglsang, 1997;Aravindkumar, 2014;Ebrahimi and Mardani, 2018), and -accelerated wake recovery (Tobin et al, 2015;Kalken and Ceyhan, 2017;Aju et al, 2020;Mühle et al, 2020).…”

Section: Overall Trends In the Covered Literaturementioning

confidence: 99%

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Madsen¹

2021

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An experimental study on the effects of winglets on the tip vortex interaction in the near wake of a model wind turbine

Cited by 22 publications

References 23 publications

CFD-based curved tip shape design for wind turbine blades

CFD-based curved tip shape design for wind turbine blades

CFD-based curved tip shape design for wind turbine blades

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