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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, Hughes and de Groot, Klaus (2006) Dynamic Stall Control by Leading Edge Vortex Generators. In: Proceedings of the 62nd Annual Forum and Technology Display, 62. American Helicopter Society 62nd Annual Forum and Technology Display, 2006-05-09 - 2006-05-11, Phoenix, AZ (USA). ISSN 1552-2938

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Official URL: http:// www.vtol.org


A new concept of passive dynamic-stall control was developed and tested on an OA209 rotorcraft airfoil during two wind-tunnel test campains 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 blade 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:Conference or Workshop Item (Speech)
Title:Dynamic Stall Control by Leading Edge Vortex Generators
AuthorsInstitution or Email of Authors
Mai, HolgerInstitut für Aeroelastik
Dietz, GuidoInstitut für Aeroelastik
Geißler, WolfgangInstitut für Aerodynamik und Strömungstechnik
Richter, KaiInstitut für Aerodynamik und Strömungstechnik
Bosbach, JohannesInstitut für Aerodynamik und Strömungstechnik
Richard, HughesInstitut für Aerodynamik und Strömungstechnik
de Groot, KlausInstitut für Aerodynamik und Strömungstechnik
Date:11 May 2006
Journal or Publication Title:Proceedings of the 62nd Annual Forum and Technology Display
Refereed publication:Yes
In ISI Web of Science:No
AHS International, UNSPECIFIED
Keywords:dynamic-stall, vortex generator, helicopter
Event Title:American Helicopter Society 62nd Annual Forum and Technology Display
Event Location:Phoenix, AZ (USA)
Event Type:international Conference
Event Dates:2006-05-09 - 2006-05-11
Organizer:American Helicopter Society
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 13:00

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