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Theoretical and experimental investigation of a structurally and aerodynamically nonlinear pitch and flap wing
Verstraelen, Edouard; Boutet, Johan; Grappasonni, Chiara et al.
2015In Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015
 

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Keywords :
Nonlinear aeroelasticity; Wind tunnel testing; Dynamic stall; Stall flutter; Leishman-Beddoes
Abstract :
[en] This paper presents and experimental and theoretical investigation of a novel nonlinear aeroelastic system. It consists of a wing with pitch and flap degrees of freedom, suspended from a leaf spring secured in a nonlinear clamp. Both the structural and the aerodynamic forces acting on the wing can be nonlinear, depending on the amplitude of oscillations. Wind tunnel experiments show that the system undergoes a supercritical Hopf bifurcation that leads to small amplitude limit cycle oscillations. At a particular airspeed, the pitch amplitude jumps to a much higher value and dynamic stall starts to occur. Three mathematical models of the system are formulated, one based on linear aerodynamics and two based on the Leishman-Beddoes dynamic stall model. The objective of the modelling is to determine whether the jump in pitch oscillation amplitude is due to dynamic stall. The predictions for amplitude, frequency and mean angle of the limit cycle oscillations are compared to the experimental observations. All three models predict the small amplitude oscillations with satisfactory accuracy. The complete Leishman-Beddoes model predicts the occurrence of a jump in pitch amplitude but the magnitude of this jump is signi cantly overestimated. The other two models completely fail to model the jump. The failure of the Leishman-Beddoes model to predict the correct post-jump oscillation amplitude may be due to the values selected for the model parameters.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Verstraelen, Edouard ;  Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Boutet, Johan ;  Université de Liège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
Grappasonni, Chiara ;  Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Kerschen, Gaëtan  ;  Université de Liège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux
Dimitriadis, Grigorios ;  Université de Liège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
Language :
English
Title :
Theoretical and experimental investigation of a structurally and aerodynamically nonlinear pitch and flap wing
Publication date :
29 June 2015
Event name :
International Forum on Aeroelasticity and Structural Dynamics
Event organizer :
Central Aerohydrodynamics Institute (TsAGI)
Event place :
Saint Petersburg, Russia
Event date :
from 28-06-2015 to 02-07-2015
Audience :
International
Main work title :
Proceedings of the International Forum on Aeroelasticity and Structural Dynamics, IFASD 2015
Pages :
Paper IFASD-2015-012
European Projects :
FP7 - 307265 - NOVIB - The Nonlinear Tuned Vibration Absorber
Name of the research project :
The Nonlinear Tuned Vibration Absorber (NoVib)
Funders :
EU - European Union [BE]
Available on ORBi :
since 08 July 2015

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