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

Type
Communications avec actes
Author
BOUDIS, Ali
38463 Centre de Développement des Energies Renouvelables [CDER]
38458 Laboratoire de Thermodynamique et des Systèmes Energétiques
BAYEUL-LAINÉ, Annie-Claude
531216 Univ. Lille, CNRS, ONERA, Arts et Metiers ParisTech, Centrale Lille, FRE 2017 - LMFL - Laboratoire de mécanique des fluides de Lille - Kampé de Fériet, F-59000 Lille, France
BENZAOUI, Ahmed
38458 Laboratoire de Thermodynamique et des Systèmes Energétiques
OUALLI, Hamid
242513 Ecole Militaire Polytechnique [Alger] [EMP]
GUERRI, Ouahiba
38463 Centre de Développement des Energies Renouvelables [CDER]

URI
http://hdl.handle.net/10985/15016
Date
2017

Abstract

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 to realize 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.

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