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Reduction of dynamic stall using a back-flow flap

Gardner, Anthony and Opitz, Steffen and Wolf, Christian and Merz, Christoph B. (2017) Reduction of dynamic stall using a back-flow flap. CEAS Aeronautical Journal, pp. 271-286. Springer. DOI: 10.1007/s13272-017-0237-4 ISSN 1869-5590

Full text not available from this repository.

Official URL: http://link.springer.com/article/10.1007/s13272-017-0237-4

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. This method of dynamic stall control has low power requirements and no parasitic drag when not actuated. Experiments in a low-speed wind tunnel at 50 m/s were used to characterize the reduction in dynamic· stall hysteresis using pressure measurements on the midline airfoil section. lt was found that 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 litt 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/111827/
Document Type:Article
Additional Information:Published online: 17 February 2017; 1869-5582 (print); 1869-5590 (Online)
Title:Reduction of dynamic stall using a back-flow flap
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Opitz, Steffensteffen.opitz (at) dlr.deUNSPECIFIED
Wolf, ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Merz, Christoph B.christoph.merz (at) dlr.deUNSPECIFIED
Date:2017
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI :10.1007/s13272-017-0237-4
Page Range:pp. 271-286
Publisher:Springer
ISSN:1869-5590
Status:Published
Keywords:Helicopter blade, Windtunnel, Flow control, Dynamic stall, Back-flow flap, Experiment
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
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Bachmann, Barbara
Deposited On:21 Nov 2017 10:26
Last Modified:08 Mar 2018 19:01

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