Numerical investigation of the effect of motion trajectory on the vortex shedding process behind a flapping airfoil
Type
Communications avec actesAuthor

38463 Centre de Développement des Energies Renouvelables [CDER]
38458 Laboratoire de Thermodynamique et des Systèmes Energétiques
Date
2017Abstract
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.
Files in this item
- Name:
- LMFL_ISROMAC_2017_BAYEUL-LAINE.pdf
- Size:
- 5.074Mb
- Format:
- Description:
- Main article
Related items
Showing items related by title, author, creator and subject.
-
BOUDIS, Ali; BENZAOUI, Ahmed; OUALLI, H; GUERRI, O; BAYEUL-LAINÉ, Annie-Claude; COUTIER-DELGOSHA, Olivier (2018)In this study, numerical investigations on the energy extraction performance of a flapping foil device are carried out by using a modified foil shape. The new foil shape is designed by combining the thick leading edge of ...
-
BOUDIS, A.; BAYEUL-LAINÉ, A. C.; BENZAOUI, A.; OUALLI, H.; GUERRI, O.; COUTIER-DELGOSHA, O. (ASME International, 2019)The effect of nonsinusoidal trajectory on the propulsive performances and the vortex shedding process behind a flapping airfoil is investigated in this study. A movement of a rigid NACA0012 airfoil undergoing a combined ...
-
CHERDIEU, Patrick; DAZIN, Antoine; DUPONT, Patrick; BAYEUL-LAINE, Annie-Claude; ROUSSETTE, Olivier; BOIS, Gérard (2013)The aim of this article is to present experimental results obtained on a fan composed of a radial impeller matched with a vaned diffuser. There is no volute downstream to the diffuser. Consequently the diffuser outlet is ...
-
BAYEUL-LAINE, Annie-Claude; SIMONET, Sophie; ISSA, Abir; BOIS, Gérard (2013)Numerous different experimental and numerical methods have been developed and are already improved in order to get rather good flow descriptions inside pump components. These calculations are generally realized assuming ...
-
CHERDIEU, Patrick; DUPONT, Patrick; BAYEUL-LAINE, Annie-Claude; DAZIN, Antoine; BOIS, Gérard (6 th international conference on pimps and fans with compressors and wind turbines, 2013)Among several different measurement techniques that have been already performed and presented in a radial impeller pump model including PIV, a directional pressure probe has been used to obtain mean velocity field and ...