Article (Scientific journals)
Experimental study of wings undergoing active root flapping and pitching
Abdul Razak, Norizham; Dimitriadis, Grigorios
2014In Journal of Fluids and Structures, 49, p. 687-704
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Keywords :
Flapping flight; unsteady aerodynamics; wind tunnel testing; dynamic stall
Abstract :
[en] This paper presents the results of experiments carried out on mechanical wings undergoing active root flapping and pitching in the wind tunnel. The objective of the work is to investigate the effect of the pitch angle oscillations and wing profile on the aerodynamic forces generated by the wings. The experiments were repeated for different reduced frequency, airspeed, flapping and pitching kinematics, geometric angle of attack and wing sections (one symmetric and two cambered airfoils). A specially designed mechanical flapper was used, modelled on large migrating birds. It is shown that, under pitch leading conditions, good thrust generation can be obtained at a wide range of Strouhal numbers if the pitch angle oscillation is adjusted accordingly. Consequently, high thrust was measured at both the lowest and the highest tested Strouhal numbers. Furthermore, the work demonstrates that the aerodynamic forces can be sensitive to the Reynolds number, depending on the camber of the wings. Under pitch lagging conditions, where the effective angle of attack amplitude is highest, the symmetric wing was affected by the Reynolds number, generating less thrust at the lowest tested Reynolds value. In contrast, under pure flapping conditions, where the effective angle of attack amplitude was lower but still significant, it was the cambered wings that demonstrated Reynolds sensitivity.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Abdul Razak, Norizham;  Université de Liège - ULiège > Département d'Aérospatiale et Mécanique > Interactions Fluide-Structure et Aérodynamique Expérimentale
Dimitriadis, Grigorios ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
Language :
English
Title :
Experimental study of wings undergoing active root flapping and pitching
Publication date :
August 2014
Journal title :
Journal of Fluids and Structures
ISSN :
0889-9746
eISSN :
1095-8622
Publisher :
Academic Press, London, United Kingdom
Volume :
49
Pages :
687-704
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 26 May 2014

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