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Airfoil load mitigation by an active slat under turbulent inflow conditions

Singh, Piyush und Neuhaus, Lars und Huxdorf, Oliver und Riemenschneider, Johannes und Wild, Jochen und Peinke, Joachim und Hölling, Michael (2019) Airfoil load mitigation by an active slat under turbulent inflow conditions. Wind Energy Science Conference 2019, 2019-06-16 - 2019-06-20, Cork, Irland.

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Kurzfassung

The presence of wind turbines in the atmospheric boundary layer causes them to be exposed to turbulent inflow conditions. The wind turbine blades experience inflow velocity fluctuations because of turbulent structures of various scales and wind gusts [1]. This results in the fluctuation of the angle of attack as perceived by the sectional airfoils. This induces fluctuating loads on the wind turbine blade, which is undesirable because of its deteriorating effect on the blade life and efficiency [2]. The massive inertia of the entire blade inhibits the common blade pitch control to react to these high frequency load fluctuations. An actively deformable leading-edge slat system was recently investigated by Neuhaus et al. [3], which aimed for airfoil load mitigation through fast reaction under sinusoidal inflow conditions .The work focused on the characterisation and estimation of the concept’s initial capabilities. It was reported that the leadingedge active slat significantly delays the stall to higher angles of attack. For a sinusoidal inflow, the active slat was able to reduce 20% of the lift force fluctuations. It was also reported that there is a dependency of the lift coefficient on the gap size between the slat and the main body of the airfoil. As it was a preliminary investigation, this property was not utilised for designing the control strategy. The present study takes the work of Neuhaus et al. [3] further by comprehensively gauging the performance of the active slat by testing it under harsh turbulent conditions. An active grid is used to create spanwise correlated turbulent inflow angle fluctuations having different intermittency levels. Figure 1 (a) shows one of the generated inflow angle time series. These fluctuations directly result in lift coefficient (CL) fluctuations (figure 1(b)). The active slat provides the ability to change the aerodynamic forces acting on the airfoil. Different open loop control strategies are designed and implemented, which leverage this property of the active slat, to reduce the fluctuating aerodynamic forces under the influence of turbulent inflow conditions. The loads on the airfoil in the controlled slat cases are compared to the case where the slat is static. For most of the cases, the control strategies are successfully able to reduce the load fluctuations. In some cases, CL standard deviation reduction of as much as 60% (figure 1(b)) are observed.

elib-URL des Eintrags:https://elib.dlr.de/129471/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Airfoil load mitigation by an active slat under turbulent inflow conditions
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Singh, PiyushUniversität OldenburgNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Neuhaus, LarsUniversität OldenburgNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Huxdorf, Oliveroliver.huxdorf (at) dlr.dehttps://orcid.org/0000-0002-4247-8278NICHT SPEZIFIZIERT
Riemenschneider, JohannesJohannes.Riemenschneider (at) dlr.dehttps://orcid.org/0000-0001-5485-8326NICHT SPEZIFIZIERT
Wild, JochenJochen.Wild (at) dlr.dehttps://orcid.org/0000-0002-2303-3214NICHT SPEZIFIZIERT
Peinke, JoachimUniversität OldenburgNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hölling, MichaelUniversität OldenburgNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:17 Juni 2019
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:active slat, airfoil load mitigation, airfoil load reduction
Veranstaltungstitel:Wind Energy Science Conference 2019
Veranstaltungsort:Cork, Irland
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:16 Juni 2019
Veranstaltungsende:20 Juni 2019
HGF - Forschungsbereich:Energie
HGF - Programm:Erneuerbare Energie
HGF - Programmthema:Windenergie
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SW - Solar- und Windenergie
DLR - Teilgebiet (Projekt, Vorhaben):E - Windenergie (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Transportflugzeuge
Institut für Faserverbundleichtbau und Adaptronik > Adaptronik
Hinterlegt von: Wild, Dr.-Ing. Jochen
Hinterlegt am:29 Okt 2019 13:50
Letzte Änderung:24 Apr 2024 20:32

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