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

Opitz, Steffen and Gardner, A. D. and Kaufmann, K. (2013) Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control. European Rotorcraft Forum 2013 (ERF2013), 03. - 05. Sept. 2013, Moskau, Russland.

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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 lowspeed 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-fibre reinforced polymer and a solid-state hinge are presented, showing the possibility of fabrication as an after-market add-on.

Item URL in elib:https://elib.dlr.de/88512/
Document Type:Conference or Workshop Item (Speech)
Title:Aerodynamic and structural investigation of an active back-flow flap for dynamic stall control
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:September 2013
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Active flap, Solid state hinge, back-flow flap, flow control, helicopter, rotor blade
Event Title:European Rotorcraft Forum 2013 (ERF2013)
Event Location:Moskau, Russland
Event Type:international Conference
Event Dates:03. - 05. Sept. 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old), Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research, L AR - Aircraft Research
DLR - Research theme (Project):L - The Active Rotorcraft (old), L - The Smart Rotorcraft (old), L - Structures & Materials (old)
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Böhringer-Thelen, Isolde
Deposited On:17 Mar 2014 08:49
Last Modified:08 May 2014 23:21

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