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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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)|
|Title:||Experimental Study of the Dynamic Stall Process on a Pitching Airfoil by means of PIV Measurements and Laser-Sheet Visualizations|
|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 08:08|
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