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Numerical investigation of the effect of ...
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Document type :
Communication dans un congrès avec actes
Title :
Numerical investigation of the effect of motion trajectory on the vortex shedding process behind a flapping airfoil
Author(s) :
Boudis, Ali [Auteur]
Laboratoire de Thermodynamique et des Systèmes Energétiques
Centre de Développement des Energies Renouvelables [CDER]
Bayeul-Lainé, Annie-Claude [Auteur]
Laboratoire de Mécanique des Fluides de Lille – Kampé de Fériet - UMR 9014 [LMFL]
Benzaoui, Ahmed [Auteur]
Laboratoire de Thermodynamique et des Systèmes Energétiques
Oualli, Hamid [Auteur]
Ecole Militaire Polytechnique [Alger] [EMP]
Guerri, Ouahiba [Auteur]
Centre de Développement des Energies Renouvelables [CDER]
Conference title :
International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
City :
Maui
Country :
Etats-Unis d'Amérique
Start date of the conference :
2017-12-16
Book title :
ISROMAC 2017
Publisher :
ISROMAC 2017
Publication date :
2017
Keyword(s) :
Flapping airfoil
Aerodynamics
Non-sinusoidal trajectory
CFD
English abstract : [en]
The effect of non-sinusoidal trajectory on the propulsive performances and the vortex shedding process behind a flapping airfoil is investigated in this study. A movement of a rigid NACA 0012 airfoil undergoing a combined ...
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The effect of non-sinusoidal trajectory on the propulsive performances and the vortex shedding process behind a flapping airfoil is investigated in this study. A movement of a rigid NACA 0012 airfoil undergoing a combined heaving and pitching motions at low Reynolds number (11 000) is considered. An elliptic function with an adjustable parameter S (flatness coefficient) is used torealize various non-sinusoidal trajectories. The two-dimensional unsteady and incompressible Navier-Stokes equation governing the flow over the flapping airfoil is resolved using the commercial so ware STAR CCM+. It is shown that the combination of sinusoidal and non-sinusoidal mapping motion has a great effect on the propulsive performances of the flapping airfoil. The maximum propulsive efficiency is always achievable with sinusoidal trajectories. However, non-sinusoidal trajectories are found to considerably improve the propulsive force up to 52% larger than its natural value. Flow visualization shows that the vortex shedding process and the wake structure are substantially altered under the non-sinusoidal trajectory effect. Depending on the nature of the flapping trajectory, several modes of vortex shedding are identified and presented in this paper.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Collections :
  • Laboratoire de Mécanique des Fluides de Lille Kampé de Fériet (LMFL) - UMR 9014
Source :
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