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Development of a passive-adaptive slat for a wind turbine airfoil

Schmidt, Florian Nils and Wild, Jochen (2021) Development of a passive-adaptive slat for a wind turbine airfoil. Wind Energy, 25 (4), pp. 747-771. Wiley. doi: 10.1002/we.2696. ISSN 1095-4244.

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Official URL: https://onlinelibrary.wiley.com/doi/10.1002/we.2696


A passive-adaptive slat concept was designed to avoid separation in the root region of a horizontal-axis wind turbine blade. This concept incorporates an autonomously moveable slat device only driven by the aerodynamic forces acting on it without the need for mechanical or electrical actuation. It opens at high local angles of attack to delay the stall angle and closes for small angles of attack to increase the lift to drag ratio of the blade segment. This article describes the development of a passive-adaptive slat for a DU-91-W2-250 airfoil, which is a segment of the reference rotor blade in the project SmartBlades 2.0. In the course of the passive-adaptive slat design, the optimization of the slat and its extended position is presented. This is followed by the development of two passive-adaptive slat kinematics, which are opening and closing the slat passively at different angles of attack. With the designed passive-adaptive slat the stall of the airfoil is delayed by 20 degree in incidence and the maximum lift of the airfoil is increased by about 130 percent at the same time in comparison to the original airfoil. Furthermore, the DU-91-W2-250 airfoil with moveable passive-adaptive slat has in most conditions a higher climb index and therefore a better aerodynamic performance than the same airfoil with a fixed integrated slat.

Item URL in elib:https://elib.dlr.de/146577/
Document Type:Article
Title:Development of a passive-adaptive slat for a wind turbine airfoil
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schmidt, Florian NilsUNSPECIFIEDhttps://orcid.org/0000-0002-5537-7214UNSPECIFIED
Wild, JochenUNSPECIFIEDhttps://orcid.org/0000-0002-2303-3214UNSPECIFIED
Date:1 December 2021
Journal or Publication Title:Wind Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 747-771
EditorsEmailEditor's ORCID iDORCID Put Code
Series Name:Wind Energy (open access)
Keywords:wind energy, high-lift system, passive stall control, rotor blade slat, passive-adaptive slat kinematics, optimization
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Photovoltaics and Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Schmidt, Florian Nils
Deposited On:06 Dec 2021 08:54
Last Modified:25 Oct 2022 09:13

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