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Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control

Opitz, Steffen and Gardner, Anthony Donald and Kaufmann, Kurt (2014) Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control. CEAS Aeronautical Journal, 5 (3), pp. 279-291. Springer Verlag. DOI: 10.1007/s13272-014-0106-3. ISSN 1869-5582.

Full text not available from this repository.

Official URL: http://link.springer.com/article/10.1007%2Fs13272-014-0106-3


The design and experimental investigation of a back-flow flap for helicopter dynamic stall control is described. A spoiler-type flap is designed, and shown by CFD to reduce the pitching moment peak during dynamic stall by 34 %. Initial experiments with a passively actuated flap in a low-speed wind tunnel showed that the opening and closing times for the flap due to the aerodynamic forces are sufficiently short and that the flap is not affected by the inertial forces of the model pitching. The experiments showed the need for a flap restraint, and that an active actuation is needed so that the flap angle is sufficient at the time of stall to have a control effect. Initial demonstrators for the structural concept of the active back-flow flap using glass fiber reinforced polymer and a solid state hinge are pre-sented, showing the possibility of fabrication as an after-market add-on.

Document Type:Article
Additional Information:Published online: 29 March 2014, September 2014
Title:Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control
AuthorsInstitution or Email of Authors
Opitz, Steffensteffen.opitz@dlr.de
Gardner, Anthony Donaldtony.gardner@dlr.de
Kaufmann, Kurtkurt.kaufmann@dlr.de
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 279-291
Henke, RolfDeutsches Zentrum für Luft- und Raumfahrt
Publisher:Springer Verlag
Keywords:Active flap, Solid state hinge, back-flow flap, flow control, helicopter, rotor blade
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Innovative Rotorcraft
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Steffen Opitz
Deposited On:22 Aug 2014 11:37
Last Modified:27 Jul 2015 15:12

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