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Dynamic Stall Control by Passive Disturbance Generators

Heine, Benjamin and Mulleners, Karen and Joubert, Gilles and Raffel, Markus (2013) Dynamic Stall Control by Passive Disturbance Generators. AIAA Journal, Vol. 51 (9), pp. 2086-2097. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.J051525. ISSN 0001-1452.

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Official URL: http://arc.aiaa.org | DOI: 10.2514/1.J051525


Passive cylindrical disturbance generators mounted near the leading edge of an airfoil significantly improved its performance under dynamic stall conditions. Time resolved particle image velocimetry and simultaneous pressure measurements were conducted at mid chord of a pitching airfoil equipped with passive disturbance generators. The disturbance generators were effective in reducing the strength of the dynamic stall vortex and therefore the negative pitching moment peak and hysteresis effects. When disturbance generators were applied, the flow separation type was altered from leading to trailing edge stall. In contrast to the clean case, reattachment was initiated immediately after the separation reached the leading edge region. Besides the circular shape, also backward and forward wedge shaped disturbance generators were investigated. While the backward wedge also showed favorable results, the forward wedge were less successful. The shape appears to have a strong influence on the effectiveness of reducing the negative impact of dynamic stall, depending on the sense of rotation of a pair of weak trailing vortices.

Item URL in elib:https://elib.dlr.de/75402/
Document Type:Article
Additional Information:Published online: 8 July 2013.
Title:Dynamic Stall Control by Passive Disturbance Generators
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mulleners, Karenmulleners (at) tfd.uni-hannover.deUNSPECIFIED
Joubert, GillesGilles.Joubert (at) onera.frUNSPECIFIED
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Vol. 51
DOI :10.2514/1.J051525
Page Range:pp. 2086-2097
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Dynamic Stall, Flow Control, PIV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
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: Heine, Benjamin
Deposited On:14 Oct 2013 13:48
Last Modified:08 Mar 2018 18:41

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