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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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Discussion papers
https://doi.org/10.5194/wes-2019-66
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2019-66
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 24 Sep 2019

Submitted as: research article | 24 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).

Parametric slat design study for thick base airfoils at high Reynolds numbers

Julia Steiner, Axelle Viré, Francesco Benetti, Nando Timmer, and Richard Dwight Julia Steiner et al.
  • Faculty of Aerospace Engineering, Kluyerweg 1, 2629 HS Delft, Netherlands

Abstract. Standard passive aerodynamic flow control devices such as vortex generators and gurney flaps have a working principle that is well understood. They increase the stall angle and the lift below stall and are mainly applied at the inboard part of wind turbine blades. However, the potential of applying a rigidly fixed leading edge slat element at inboard blade stations is less well understood but has received some attention in the past decade. This solution may offer advantages not only under steady conditions but also under unsteady inflow conditions such as yaw. This article aims at further clarifying what an optimal two-element configuration with a thick main element would look like, and what kind of performance characteristics can be expected from a purely aerodynamic point of view. To accomplish this an aerodynamic shape optimization procedure is used to derive optimal profile designs for different optimization boundary conditions including the optimization of both the slat and the main element. The performance of the optimized designs shows several positive characteristics as compared to single element airfoils, such as a high stall angle, high lift below stall, low roughness sensitivity and higher aerodynamic efficiency. Furthermore, the results highlight the benefits of an integral design procedure, where both slat and main element are optimized, over an auxiliary one. Nevertheless, the designs also have two caveats, namely a steep drop in lift post-stall and high positive pitching moments.

Julia Steiner et al.
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Julia Steiner et al.
Julia Steiner et al.
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Short summary
The manuscript deals with the aerodynamic design of slat elements for thick base airfoils at high Reynolds numbers using Integral Boundary Layer and Computational Fluid Dynamics models. The results highlight aerodynamic benefits such as high stall angle, low roughness sensitivity and higher aerodynamic efficiency than standard single element configurations. However, this is accompanied by a steep drop in lift post-stall and potentially issues related to the structural design of the blade.
The manuscript deals with the aerodynamic design of slat elements for thick base airfoils at...
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