Reference : Subcritical, nontypical and period doubling bifurcations of a Delta Wing in a low speed ...
Scientific journals : Article
Engineering, computing & technology : Aerospace & aeronautics engineering
http://hdl.handle.net/2268/81747
Subcritical, nontypical and period doubling bifurcations of a Delta Wing in a low speed wind tunnel
English
Korbahti, Banu [University of Istanbul > Faculty of Engineering > > >]
Kagambage, Emile [Université de Liège - ULg > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
Andrianne, Thomas mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Département d'aérospatiale et mécanique >]
Norizham, Abdul Razak [Université de Liège - ULg > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
Dimitriadis, Grigorios mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale >]
2011
Journal of Fluids & Structures
Academic Press
27
3
408-426
Yes (verified by ORBi)
International
0889-9746
London
United Kingdom
[en] Limit Cycle Oscillations ; Nonlinear aeroelasticity ; Delta wing ; Bifurcation
[en] Limit Cycle Oscillations (LCOs) involving Delta wings are an important area of research in modern aeroelasticity. Such phenomena can be the result of geometric or aerodynamic nonlinearity. In this paper, a flexible half-span Delta wing is tested in a low speed wind tunnel in order to investigate its dynamic response. The wing is designed to be more flexible than the models used in previous research on the subject in order to expand the airspeed range in which LCOs occur. The experiments reveal that this wing features a very rich bifurcation behavior. Three types of bifurcation are observed for the first time for such an aeroelastic system: subcritical bifurcations, period doubling/period halving and nontypical bifurcations. They give rise to a great variety of LCOs, even at very low angles of attack.The LCOs resulting from the nontypical bifurcation display Hopf-type behavior, i.e. have fundamental frequencies equal to one of the linear modal frequencies. All of the other LCOs have fundamental frequencies that are unrelated to the underlying linear system modes.
Researchers ; Professionals
http://hdl.handle.net/2268/81747
10.1016/j.jfluidstructs.2010.12.001
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