Goodarzi, Fahimeh, Di Labbio, Giuseppe et Mani, Mahmoud.
2025.
« Unsteady wake characteristics of a plunging airfoil at post-stall conditions ».
In Proceedings of the CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025)
Coll. « Progress in Canadian Mechanical Engineering », vol. 8.
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Résumé
The unsteady wake characteristics of a plunging airfoil were investigated experimentally during near-stall and post-stall conditions for an Eppler 361 airfoil at Reynolds number Re = 2.5×104. Oscillation frequencies of 1.0 Hz and 3.0 Hz (reduced frequencies ?? = 0.19 and 0.57, respectively) are considered for a total plunging depth of 16 cm (1.07??) and three different initial angles of attack (??0 = 0°, 10°, 15°). The results show that the leading- and trailing-edge vortices have a more dominant effect on the wake velocity for initial angles of attack both near (??0 = 10°) and post (??0 = 15°) stall of the airfoil. The results show periodic variations in wake velocity with notably different behavior in the lower portion of the wake between near and post stall cases. For the post-stall condition, the wake velocity experiences clearly periodic larger fluctuations in the center of wake, indicative of periodic vortex shedding. The unsteady flow field of a plunging airfoil exhibits hysteresis effects, forming a closed loop in the velocity-position diagram with differing velocity magnitudes between the upstroke and downstroke motions. The reduced frequency has a significant influence on wake velocity and therefore on aerodynamic loads.
| Type de document: | Compte rendu de conférence |
|---|---|
| Éditeurs: | Éditeurs ORCID Hof, Lucas A. NON SPÉCIFIÉ Di Labbio, Giuseppe NON SPÉCIFIÉ Tahan, Antoine NON SPÉCIFIÉ Sanjosé, Marlène NON SPÉCIFIÉ Lalonde, Sébastien NON SPÉCIFIÉ Demarquette, Nicole R. NON SPÉCIFIÉ |
| Professeur: | Professeur Di Labbio, Giuseppe |
| Affiliation: | Génie mécanique |
| Date de dépôt: | 18 déc. 2025 15:11 |
| Dernière modification: | 18 déc. 2025 15:11 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32405 |
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