Near-wall aerodynamic response of an acoustic liner to harmonic excitation with grazing flow - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2019

Near-wall aerodynamic response of an acoustic liner to harmonic excitation with grazing flow

Résumé

The near-orifice aerodynamic response of a single degree of freedom acoustic liner to tonal and multi-tonal excitation with grazing flow was experimentally studied. A high-magnification PIV setup was designed in order to provide dense 2D velocity field measurements above a millimeter-sized orifice of the liner. The resonator near-orifice velocity dynamics near and far from resonance were shown to be significantly different, with dynamic velocity scales well captured by a lumped-element model that was also satisfactorily applied to multi-tonal forcing cases. The effects of varying the forcing acoustic sound pressure level and the tangential flow velocity scale (the friction velocity) were investigated. It was observed that a "rough-wall" analogy was not suited to account for the induced aerodynamic effects, but that, under certain conditions, a "transpiration wall" analogy may be of interest.
Fichier principal
Vignette du fichier
article.pdf (1.53 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02087873 , version 1 (02-04-2019)

Identifiants

Citer

Olivier Léon, Fabien Méry, Estelle Piot, Claudia Conte. Near-wall aerodynamic response of an acoustic liner to harmonic excitation with grazing flow. 2019. ⟨hal-02087873⟩

Collections

ONERA
336 Consultations
339 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More