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

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 to provide dense 2D velocity field measurements above an orifice of the liner. The resonato...

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Bibliographic Details
Published in:Experiments in fluids 2019-09, Vol.60 (9), p.1-18, Article 144
Main Authors: Léon, Olivier, Méry, Fabien, Piot, Estelle, Conte, Claudia
Format: Article
Language:English
Subjects:
Acoustic liners
Acoustics
Aerodynamics
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Flow velocity
Fluid- and Aerodynamics
Grazing flow
Harmonic excitation
Heat and Mass Transfer
Orifices
Research Article
Sound pressure
Transpiration
Velocity distribution
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Summary: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 to provide dense 2D velocity field measurements above an 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 mean aerodynamic effects, but that, under certain conditions, a “transpiration wall” analogy may be of interest. Graphic abstract
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-019-2791-5