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Experimental Study of the Dynamic Stall Process on a Pitching Airfoil by means of PIV Measurements and Laser-Sheet Visualizations

Wernert, P. and Koerber, G. and Wietrich, F. and Raffel, M. and Kompenhans, J. (1994) Experimental Study of the Dynamic Stall Process on a Pitching Airfoil by means of PIV Measurements and Laser-Sheet Visualizations. 7th Int. Symp. on Applications of Laser Techniques to Fluid Mechanics, July 11th t o 14th 1994; Lisbon Portugal.

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Abstract

The unsteady flowfield above a NACA 0012 airfoil pitching under deep dynamic stall conditions has been investigated in a low-speed wind tunnel by means of Particle Image Velocimetry measurements and lasersheet visualizations. The PIV results show the occurrence of small-scale structures in the separated flowfield and even within the dynamic stall vortex for increasing incidences, and the complex flow behaviour during the downstroke regime. Due to the finite shutter speed of the video camera, the visualization technique cannot record such structures: instead, we obtain a large scale vortex rolling up in the upstroke. Thus it is seen that PIV allows to better analyze the qualitative unsteady separated flow- fields.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1994,
Title:Experimental Study of the Dynamic Stall Process on a Pitching Airfoil by means of PIV Measurements and Laser-Sheet Visualizations
Authors:
AuthorsInstitution or Email of Authors
Wernert, P.ISL, Saint-Louis
Koerber, G.ISL
Wietrich, F.ISL
Raffel, M.UNSPECIFIED
Kompenhans, J.UNSPECIFIED
Date:1994
Status:Published
Keywords:Dynamic Stall Process, Pitching Airfoil, PIV, Laser-Sheet Visualization, NACA 0012 airfoil, Particle Image Velocimetry
Event Title:7th Int. Symp. on Applications of Laser Techniques to Fluid Mechanics, July 11th t o 14th 1994; Lisbon Portugal
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L DT - Drehflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:08

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