ORBi: Andrianne Thomas - Wind tunnel analysis of separated aerodynamics leading to different types of torsional flutter in bluff-bodies.

Reference : Wind tunnel analysis of separated aerodynamics leading to different types of torsional f...


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Aerospace & aeronautics engineering
	To cite this reference:	http://hdl.handle.net/2268/91643

Title :	Wind tunnel analysis of separated aerodynamics leading to different types of torsional flutter in bluff-bodies.
Language :	English
Author, co-author :	Andrianne, Thomas [Université de Liège - ULg > Département d'aérospatiale et mécanique > Département d'aérospatiale et mécanique >]
	Korbahti, Banu [University of Istanbul > Faculty of Engineering > > >]
	Dimitriadis, Grigorios [Université de Liège - ULg > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
Publication date :	29-Jun-2011
Main document title :	Proceedings of the 15th International Forum on Aeroelasticity and Structural Dynamics, IFASD 2011
Pages :	Paper number IFASD-2011-137
Peer reviewed :	No
Audience :	International
Event name :	International Forum on Aeroelasticity and Structural Dynamics
Event date :	from 26-06-2011 to 30-06-2011
Event organizer :	Association Aéronautique Astronautique de France (3AF)
	Council of European Aerospace Sciences (CEAS)
	American Institute of Aeronautics and Astronautics
Event place (city) :	Paris
Event country :	France
Keywords :	[en] Bluff body aerodynamic ; Unsteady aerodynamic ; Limit Cycle Oscillations
Abstract :	[en] A new experimental apparatus has been developed at the wind tunnel laboratory of University of Liège with the objective to study the torsional flutter instability of a rectangular cylinder. Different configurations, based on the position of the pitching axis, the stiffness of the restoring springs and the static equilibrium angle of the model have been tested and analysed. Sub- and supercritical bifurcations behaviour has been identified. The dynamics of the system, as well as the aerodynamic phenomena taking place around the model have been measured. The frequency content of the pitching displacement and the longitudinal component of the velocity in the wake showed the occurrence of two types of aerodynamic instability: large separation from the leading edge and vortex shedding in the Strouhal sense. Furthermore, preliminary Particle Image Velocimetry visualisation confirmed the presence of complex aerodynamic phenomena over the upper surface and in the wake of the model. These measurements allow a better understanding of the sources of aerodynamic excitation leading to torsional flutter.
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/91643
Other URL :	http://www.ifasd2011.com/

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