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Dynamic stall control by leading edge vortex generators

Mai, Holger and Dietz, Guido and Geissler, Wolfgang and Richter, Kai and Bosbach, Johannes and Richard, Hugues and de Groot, Klaus (2008) Dynamic stall control by leading edge vortex generators. Journal of the American Helicopter Society, 53 (1), pp. 26-36. ISSN 0002-8711.

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A new concept of passive dynamic-stall control was developed and tested on an OA 209 rotorcraft airfoil during two wind-tunnel test campaigns in 2004 and 2005. Small vortex generators are mounted at the leading edge of the rotor blade. At low incidence they are located close to the stagnation point and do not impact the flow field. At high angles of attack the so-called leading edge vortex generators (LEVoGs) induce longitudinal vortices which impact the suction side flow. It is shown that the use of LEVoGs can significantly increase the overall time-averaged lift while an unwanted negative pitching-moment peak is reduced compared with the clean-wing case. Furthermore, overall drag is reduced at dynamic-stall conditions. Detailed analysis of the flow field by particle image velocimetry and infrared thermography show that this is achieved by a disturbance of the dynamic-stall vortex and therefore separation is partially prevented.

Document Type:Article
Title:Dynamic stall control by leading edge vortex generators
AuthorsInstitution or Email of Authors
Geissler, WolfgangUNSPECIFIED
Bosbach, JohannesUNSPECIFIED
Richard, HuguesUNSPECIFIED
de Groot, KlausUNSPECIFIED
Journal or Publication Title:Journal of the American Helicopter Society
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 26-36
Keywords:dynamic stall, leading edge vortex
HGF - Research field:Aeronautics, Space and Transport (old)
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: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Institute of Aeroelasticity
Deposited By: Daniela Erdmann
Deposited On:28 Apr 2008
Last Modified:27 Apr 2009 14:55

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