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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
Abstract
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) | ||||||||||||||||
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| Title: | Dynamic Stall Control by Leading Edge Vortex Generators | ||||||||||||||||
| Authors: |
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| 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 | ||||||||||||||||
| Volume: | 62 | ||||||||||||||||
| Editors: |
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| ISSN: | 1552-2938 | ||||||||||||||||
| Status: | Published | ||||||||||||||||
| 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 | ||||||||||||||||
| HGF - Program: | Aeronautics | ||||||||||||||||
| HGF - Program Themes: | L RR - Rotorcraft Research | ||||||||||||||||
| 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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