Titre :

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

Auteur(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]

Titre de la manifestation scientifique :

International Symposium on Transport Phenomena and Dynamics of Rotating Machinery

Ville :

Maui

Pays :

Etats-Unis d'Amérique

Date de début de la manifestation scientifique :

2017-12-16

Titre de l’ouvrage :

ISROMAC 2017

Éditeur :

ISROMAC 2017

Date de publication :

2017

Mot(s)-clé(s) :

Flapping airfoil
Aerodynamics
Non-sinusoidal trajectory
CFD

Résumé en anglais : [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 ...
Lire la suite >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.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

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

Source :

Harvested from HAL