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Experiments in Fluids

, 60:144 | Cite as

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

  • Olivier LéonEmail author
  • Fabien Méry
  • Estelle Piot
  • Claudia Conte
Research Article
  • 146 Downloads

Abstract

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

Notes

Acknowledgements

This project has partly received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation program under Grant agreement no. 681856—ASPIRE. The authors wish to thank Delphine Sebbane for her technical assistance and expertise on the B2A duct and Airbus for manufacturing the acoustic liner.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.ONERA/DMPE, Université de ToulouseToulouseFrance

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