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Experimental Investigation of the Unsteady Velocity and Vorticity Fields above a Pitching Airfoil Operating under Dynamic Stall Conditions in a Wind Tunnel

Raffel, M. and Kompenhans, J. and Wernert, P. and Schäfer, H.J. and Geißler, W. (1994) Experimental Investigation of the Unsteady Velocity and Vorticity Fields above a Pitching Airfoil Operating under Dynamic Stall Conditions in a Wind Tunnel. AGARD 75th Fluid Dynamics Panel Meeting and Symposium on Aerodynamics and Aeroacoustics of Rotorcraft, 10-13.10.94, in Berlin, Germany.

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Abstract

For the first time the unsteady flow field above a airfoil airfoil oscillating in pitch has been investigated in a wind tunnel by means of Particle Image Velocimetry (PIV). Due to the short measuring time of only a few microseconds instanteneous flow fields could be measured. The unsteady flow fields above an airfoil under deep dynamic stall conditions (oscillation frequency f &#61 6,6 Hz) have been measured in the subsonic wind tunnel of the French German research Institute of Saint Loius (ISL). A number of numerical studies of this problem have been already carried out. Experimental flow field data are required to validate these numericalcalculaitons. Two different flow conditions were realized in order to obtain a flow field similar to that above a retreating rotor blade of a helicopter. First, a reduced frequency of omega * &#61 0.3 has been choosen to get results for a comparision with other experimental and numerical investigations.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=1993, pages=2,
Title:Experimental Investigation of the Unsteady Velocity and Vorticity Fields above a Pitching Airfoil Operating under Dynamic Stall Conditions in a Wind Tunnel
Authors:
AuthorsInstitution or Email of Authors
Raffel, M.UNSPECIFIED
Kompenhans, J.UNSPECIFIED
Wernert, P.UNSPECIFIED
Schäfer, H.J.UNSPECIFIED
Geißler, W.UNSPECIFIED
Date:1994
Status:Published
Keywords:Unsteady Velocity Fields, Pitching Airfoil, Dynamic Stall, Particle Image Velocimetry, rotor blade of helicopter, reduced frequency
Event Title:AGARD 75th Fluid Dynamics Panel Meeting and Symposium on Aerodynamics and Aeroacoustics of Rotorcraft, 10-13.10.94, in Berlin, Germany
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
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 10:07

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