Thick airfoil designs for the root of the 10MW INNWIND.EU wind turbine

Muñoz, Arturo; Méndez, Beatriz; Munduate, Xabier

doi:10.1088/1742-6596/753/2/022046

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…As the blades have a share in price of more than 25%, now, thick airfoil up to 60% (measured as thickness to chord ratio) in the transition part from the cylindrical hub to the beginning of the energy producing profiles (see Figure 1) starts to be of interest for blade developers. Other work in this field have been published by 4‐6 to name a few only. Muñoz et al 4 investigated a 50% thick airfoil in the root‐section of a 10‐MW wind turbine by using an evolutionary algorithm and Xfoil.…”

Section: Introductionmentioning

confidence: 99%

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A thick aerodynamic profile with regions of negative lift slope and possible implications on profiles for wind turbine blades

Schaffarczyk

Arakawa

2020

Wind Energy

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In the high pressure wind tunnel (HochDruckkanal Goettingen [HDG]) of Deutsch–Niederländische Windkanäle—German–Dutch Wind Tunnels (DNW) a 47% thick airfoil‐like symmetrical profile was investigated at a high (3 to 12 million) Reynolds number. As an unusual feature, a negative lift slope dcL/dα < 0 close to zero lift has been re‐observed under specific circumstances. We describe the findings and offer some explanations using two‐dimensional (2D) unsteady, transitional computational fluid dynamics. Possible implications for very thick aerodynamic profiles for use on wind turbine blades are discussed.

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Section: Introductionmentioning

confidence: 99%

“…Other work in this field have been published by 4‐6 to name a few only. Muñoz et al 4 investigated a 50% thick airfoil in the root‐section of a 10‐MW wind turbine by using an evolutionary algorithm and Xfoil. The main goal was to reach a high lift coefficient as high as possible.…”

Section: Introductionmentioning

confidence: 99%

A thick aerodynamic profile with regions of negative lift slope and possible implications on profiles for wind turbine blades

Schaffarczyk

Arakawa

2020

Wind Energy

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“…The inaccuracy is due to the insensitivity of the transition model when an increased pressure gradient appears over the airfoil upper surface, which is typical for thick airfoils. XFOIL is known to be inaccurate for thick airfoils as well. Figure depicts the equivalent lift and drag coefficients for the blade shown in Figure .…”

Section: Comparison Tests and Resultsmentioning

confidence: 99%

Development of an aeroelastic code based on three‐dimensional viscous–inviscid method for wind turbine computations

et al. 2017

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Aerodynamic and structural dynamic performance analysis of modern wind turbines are routinely estimated in the wind energy field using computational tools known as aeroelastic codes. Most aeroelastic codes use the blade element momentum (BEM) technique to model the rotor aerodynamics and a modal, multi‐body or the finite‐element approach to model the turbine structural dynamics. The present work describes the development of a novel aeroelastic code that combines a three‐dimensional viscous–inviscid interactive method, method for interactive rotor aerodynamic simulations (MIRAS), with the structural dynamics model used in the aeroelastic code FLEX5. The new code, called MIRAS‐FLEX, is an improvement on standard aeroelastic codes because it uses a more advanced aerodynamic model than BEM. With the new aeroelastic code, more physical aerodynamic predictions than BEM can be obtained as BEM uses empirical relations, such as tip loss corrections, to determine the flow around a rotor. Although more costly than BEM, a small cluster is sufficient to run MIRAS‐FLEX in a fast and easy way. MIRAS‐FLEX is compared against the widely used FLEX5 and FAST, as well as the participant codes from the Offshore Code Comparison Collaboration Project. Simulation tests consist of steady wind inflow conditions with different combinations of yaw error, wind shear, tower shadow and turbine‐elastic modeling. Turbulent inflow created by using a Mann box is also considered. MIRAS‐FLEX results, such as blade tip deflections and root‐bending moments, are generally in good agreement with the other codes. Copyright © 2017 John Wiley & Sons, Ltd.

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“…The root section of a wind turbine blade consists of thick airfoils that smoothly transition from a cylindrical cross-section to thinner airfoils in the outer part of the blade [1]. This makes the flow at the root particularly challenging because their large thickness commonly causes detachment of the boundary layer in the upper and lower parts of the airfoil [2,3,4], resembling more bluff-body flows than thin airfoil flows.…”

Section: Introductionmentioning

confidence: 99%

Limitations of lift correction models for thick airfoils in wind turbine roots

Céspedes,

Bak,

Zahle

2024

J. Phys.: Conf. Ser.

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The flow in wind turbine blade root sections has proven to be challenging to predict for two main reasons; the use of thick airfoils (relative thickness greater than 40%) and three-dimensional effects including a strong radial flow. Several lift correction models have addressed these 3D effects acting on the inner part of rotating blades, however, they are derived for thinner airfoils in a stall-delay context, which changes significantly in thick airfoils, as found in modern wind turbines. This study numerically evaluates the performance of a 10 MW reference rotor in realistic operational conditions, as well as analytical rotors, in 3D and 2D CFD computations. It is found that, for thick airfoils, traditional lift correction models under-predict the lift coefficient by more than 1, depending on the operational conditions. But for non-thick airfoils, the difference between predicted and real lift coefficient is typically less than 0.5. Furthermore, a new correction term is proposed, which considers the effects introduced by thick airfoils and brings the overall error to the same level as for non-thick sections.

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Thick airfoil designs for the root of the 10MW INNWIND.EU wind turbine

Cited by 3 publications

References 2 publications

A thick aerodynamic profile with regions of negative lift slope and possible implications on profiles for wind turbine blades

A thick aerodynamic profile with regions of negative lift slope and possible implications on profiles for wind turbine blades

Development of an aeroelastic code based on three‐dimensional viscous–inviscid method for wind turbine computations

Limitations of lift correction models for thick airfoils in wind turbine roots

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