Design and laboratory tests of flexible trailing edge demonstrators for wind turbine blades. Issue 2 (April 2023)

• Record Type: Journal Article
• Authors: Pohl, Martin; Riemenschneider, Johannes
• Is Part Of: Wind engineering. Volume 47:Issue 2(2023)
• Page Start: 283
• Page End: 298
• Publication Date: 2023-04
• Subjects: Morphing -- root bending moment -- load alleviation -- trailing edge flap; Wind-pressure -- Periodicals; Winds -- Periodicals; Wind power -- Periodicals; Engineering meteorology -- Periodicals; Pression du vent; Vents; Énergie éolienne; Météorologie appliquée; Engineering meteorology; Wind power; Wind-pressure; Winds; Periodicals; 621.4505
• DOI: 10.1177/0309524X221126743
• Languages: English
• ISSNs: 0309-524X

Abstract

To increase the power yield, wind turbines have significantly grown in the last decades. Today, this growth is more and more limited by the weight of the structures and fatigue loads. To compensate these loads, especially flapwise root bending moments, trailing edge flaps can be used. They can change the lift of the blade with little delay to equalize the aerodynamic lift and by this reduce the fatigue amplitude. Such a trailing edge flap has been designed, developed, built and experimentally tested. It uses a flexible, morphing design to seal the entire mechanics against environmental influences, such as rain, dust, or insects. Therefore a design made from glass fiber reinforced plastics in combination with elastomer materials is used. In this paper the design process from the concept to two consecutive demonstrators is presented. Both are tested in the laboratory for their morphing characteristics.