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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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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)
Title:Investigation of unsteady flow development over a pitching airfoil by means of TR-PIV
Authors:
AuthorsInstitution or Email of Authors
Mulleners, KarenUNSPECIFIED
Henning, ArneUNSPECIFIED
Mai, HolgerUNSPECIFIED
Raffel, MarkusUNSPECIFIED
Costes, MichelONERA
Le Pape, ArnaudONERA
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:Aeronautics, Space and Transport
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
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:12 Dec 2013 20:33

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