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Wind Tunnel and Water Tunnel Studies of Vertical Fin Buffeting

Woppowa, S. and Grosche, F.-R. (1996) Wind Tunnel and Water Tunnel Studies of Vertical Fin Buffeting. In: Notes on Numerical Methods. Vieweg-Verlag.

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Abstract

Many advanced combat aircrafts operating at high angles of attack experience unsteady vortex flows with strong pressure fluctuations which cause problems such as vertical fin buffeting. This paper presents selected results of comprehensive wind tunnel and water tunnel tests. Sharply peaked spectra of the surface pressure fluctuations on each side of the fin are observed at high angles of attack. Unsing the dominant frequency in the vortical flow field a characteristic value of a reduced frequency parameter could be obtained for the considered model configurations. Employing Digital Image Velocimetry in the water tunnel the instantaneous flow field over the model was studied. A nearly periodical oscillation of the velocity vectors has been observed in front of the leading edge of the fin. The oscillation is mainly driven by the vortex shedding from the leading edge of the main wings and induces a periodic side force on the fin.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1996, pages=8,
Title:Wind Tunnel and Water Tunnel Studies of Vertical Fin Buffeting
Authors:
AuthorsInstitution or Email of Authors
Woppowa, S.UNSPECIFIED
Grosche, F.-R.UNSPECIFIED
Date:1996
Journal or Publication Title:Notes on Numerical Methods
Publisher:Vieweg-Verlag
Status:Published
Keywords:Wind Tunnel, Water Tunnel, High Angles of Attack, Combat Aircrafts, Low Aspect Ratio Wings, Fin Buffeting, Unsteady Flow Field, Vortex Shedding, Vortex Interaction, Digital PIV
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L ST - Starrflüglertechnologien
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 10:09

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