Title :

Numerical investigation of the effect of motion trajectory on the vortex shedding process behind a flapping airfoil

Author(s) :

Boudis, Ali [Auteur]
Centre de Développement des Energies Renouvelables [CDER]
Laboratoire de Thermodynamique et des Systèmes Energétiques
Bayeul-Lainé, Annie-Claude [Auteur]
Laboratoire de Mécanique des Fluides de Lille - Kampé de Fériet [LMFL]
Benzaoui, Ahmed [Auteur]
Laboratoire de Thermodynamique et des Systèmes Energétiques
Oualli, Hamid [Auteur]
École 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 ...
Show more >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

Popular science :

Non

Collections :

• Laboratoire de Mécanique des Fluides de Lille Kampé de Fériet (LMFL) - UMR 9014

Source :

Harvested from HAL