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
Abstract
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/ | ||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||||||
Title: | Experiment demonstrating reduction of dynamic stall by a back-flow flap | ||||||||||||||||||||
Authors: |
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Date: | 2016 | ||||||||||||||||||||
Refereed publication: | No | ||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||
In SCOPUS: | No | ||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||
Status: | Published | ||||||||||||||||||||
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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