[en] Torsional Stall Flutter (TSF) is a one degree of
freedom, self-excited phenomenon induced by the periodic
separation/re-attachment of the flow around a body. The
present paper proposes an experimental investigation of TSF
on a bridge deck. A section model free to oscillate in torsion
is tested in a low-speed wind tunnel. Static and dynamic tests
are performed to enable a complete interpretation of the
phenomena involved. For low airspeeds, the Karman vortex
shedding excites the structure, resulting in small oscillations
at the vortex shedding frequency. For high airspeeds, the
deck undergoes Limit Cycle Oscillations (LCO) due to the
TSF phenomenon. Nevertheless the Karman vortex
shedding excitation is still present and appears in the
measured forces signals. Peaks and troughs in the lift
coefficient are detected for each pitching period. They are
interpreted as the separation/re-attachment of the flow
around the deck. The large amplitudes motion of the deck
undergoing TSF reduces the amplitude of the aerodynamic
lift coefficient.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Andrianne, Thomas ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Département d'aérospatiale et mécanique
Dimitriadis, Grigorios ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
Language :
English
Title :
Wind tunnel investigation of the stall flutter oscillations of a bridge deck
Publication date :
May 2009
Event name :
8th National Congress on Theoretical and Applied Mechanics
Event organizer :
National Committee for Theoretical and Applied Mechanics
Event place :
Brussels, Belgium
Event date :
du 28 mai au 29 mai 2009
Main work title :
Proceedings of the 8th National Congress on Theoretical and Applied Mechanics