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Experiment demonstrating reduction of dynamic stall by a back-flow flap

Gardner, Anthony Donald and Opitz, Steffen and Wolf, Christian C. and Merz, Christoph B. (2016) Experiment demonstrating reduction of dynamic stall by a back-flow flap. AHS 72nd Annual Forum, West Palm Beach, Florida, May 17–19, 2016, 2016-05-17 - 2016-05-19, Florida, USA.

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Official URL: https://vtol.org/store/product/experiment-demonstrating-reduction-of-dynamic-stall-by-a-backflow-flap-11369.cfm


A back-flow flap attached to the suction side of an airfoil is investigated in both passively and actively actuated modes for the control of dynamic stall. Experiments in a low-speed wind tunnel at 50 m/s were used to characterise the reduction in dynamic stall using pressure measurements on the midline of an airfoil. The pitching moment peak is reduced by an average of 25% for all deep stall test cases for active actuation of the flap, while for passive actuation the pitching moment peak is reduced by 19%. In each case the maximum lift remained the same, while the peak drag increased by an average of 2.5% for the active flap, and by 0.9% for the passive flap. With the flap closed at low angles of attack, the reference values of the airfoil are retained.

Item URL in elib:https://elib.dlr.de/103889/
Document Type:Conference or Workshop Item (Speech)
Title:Experiment demonstrating reduction of dynamic stall by a back-flow flap
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Opitz, SteffenUNSPECIFIEDhttps://orcid.org/0000-0003-1257-547XUNSPECIFIED
Wolf, Christian C.UNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:flow control, dynamic stall, back-flow flap
Event Title:AHS 72nd Annual Forum, West Palm Beach, Florida, May 17–19, 2016
Event Location:Florida, USA
Event Type:international Conference
Event Start Date:17 May 2016
Event End Date:19 May 2016
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 Virtual Aerodynamic Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Bachmann, Barbara
Deposited On:12 Jan 2017 16:29
Last Modified:24 Apr 2024 20:09

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