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Load Reduction of Wind Turbines Using Trailing Edge Flaps

Oltmann, Nils-Christian and Sobotta, Dorit and Hoffmann, Arndt (2017) Load Reduction of Wind Turbines Using Trailing Edge Flaps. The 4th International Conference On Energy and Environment Research, 17.- 20. July 2017, Porto, Portugal.

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Horizontal axis wind turbines have become an attractive renewable energy source due to their low carbon foot print. It was the aim of this study to reduce fatigue inducing variations of the blade root bending moment and thus enable the construction of lighter structures which further reduces the carbon footprint. Within the Smart Blades project the IWT-7.5-164 wind turbine has been used to investigate the feasibility of using trailing edge flaps as active control mechanism for load reduction. The analysis has been conducted using the German Aerospace Center’s in-house comprehensive rotor simulation code S4 to simulate the aerodynamics as well as the structural deformation. For a tilted rotor without flaps the blade root bending moment acting perpendicular to the rotor plane has been observed to undergo a characteristic cyclic variation due to the tilt and gravity. Adding trailing edge flaps with a constant deflection alters the mean bending moment of the cyclic variation. A following study addressed the effect of using a sinusoidal flapping motion for a range of flapping amplitudes and phases. As a result a configuration has been identified that eliminates the cyclic variation of the blade root bending moment.

Item URL in elib:https://elib.dlr.de/113532/
Document Type:Conference or Workshop Item (Speech)
Title:Load Reduction of Wind Turbines Using Trailing Edge Flaps
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Oltmann, Nils-Christiann.oltmann (at) simtec.deUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Wind Turbine; Flaps; Bending Moment; Fatigue; Smart Blades; IWT-7.5-164
Event Title:The 4th International Conference On Energy and Environment Research
Event Location:Porto, Portugal
Event Type:international Conference
Event Dates:17.- 20. July 2017
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Rotorcraft
Deposited By: Sobotta, Dorit
Deposited On:01 Aug 2017 13:13
Last Modified:01 Aug 2017 13:13

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