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Investigation of unsteady flow development over a pitching airfoil by means of TR-PIV
Mulleners, Karen and Henning, Arne and Mai, Holger and Raffel, Markus and Costes, Michel and Le Pape, Arnaud (2009) Investigation of unsteady flow development over a pitching airfoil by means of TR-PIV. 27th AIAA Applied Aerodynamics, 2009-06-22 - 2009-06-25, San Antonio, Texas.
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Official URL: http://www.aiaa.org
Abstract
The flow over an OA209 airfoil subjected to a sinusoidal pitching motion under dynamic stall conditions is investigated experimentally by means of time resolved particle image velocimetry (TR-PIV) and surface pressure measurements. Dynamic stall is distinguished by the formation and convection of large scale coherent structures and a delay in massive flow separation. A vortex detection scheme based on an identification function derived directly from the velocity fields is adopted to identify vortex cores. The combination of global time resolved imaging and an automated vortex identification algorithm allows for the investigation of the spatial and temporal evolution of vortical structures within a single oscillation. Furthermore, the mechanisms associated with the dynamic stall delay are considered.
| Document Type: | Conference or Workshop Item (Speech, Paper) | ||||||||||||||
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| Title: | Investigation of unsteady flow development over a pitching airfoil by means of TR-PIV | ||||||||||||||
| Authors: |
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| Date: | 2009 | ||||||||||||||
| Series Name: | Conference Proceedings | ||||||||||||||
| Status: | Published | ||||||||||||||
| Keywords: | dynamic stall, TR-PIV, vortex detection, flow separation, pitching airfoil | ||||||||||||||
| Event Title: | 27th AIAA Applied Aerodynamics | ||||||||||||||
| Event Location: | San Antonio, Texas | ||||||||||||||
| Event Type: | international Conference | ||||||||||||||
| Event Dates: | 2009-06-22 - 2009-06-25 | ||||||||||||||
| Organizer: | AIAA | ||||||||||||||
| HGF - Research field: | no assignement | ||||||||||||||
| HGF - Program: | Aeronautics | ||||||||||||||
| HGF - Program Themes: | L - no assignement | ||||||||||||||
| DLR - Research area: | Aeronautics | ||||||||||||||
| DLR - Program: | L - no assignement | ||||||||||||||
| DLR - Research theme (Project): | ["eprint_fieldopt_dlr_project_search_L000" not defined] | ||||||||||||||
| Location: | Göttingen | ||||||||||||||
| Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Helicopters Institute of Aerodynamics and Flow Technology > Experimental Methods Institute of Aeroelasticity | ||||||||||||||
| Deposited By: | Karen Mulleners | ||||||||||||||
| Deposited On: | 26 Nov 2009 15:14 | ||||||||||||||
| Last Modified: | 23 Feb 2011 11:15 |
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