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Acoustic of a perforated liner with grazing flow: Floquet-Bloch periodical approach versus impedance continuous approach

Abstract : The effect of a shear flow on an acoustic liner consisting of a perforated plate backed by cavities is studied. Two different approaches are investigated: First, the duct and the liner are considered as a periodic system while in the second approach the liner is considered as homogeneous and described by an impedance. Those two approaches coincide perfectly without flow for a small hole spacing compared to the acoustic wavelength. This work demonstrates that those two approaches are not wholly consistent when a shear flow is present and reveals some problems in the use of the local impedance with flow. The no-flow impedance cannot be used to describe the liner when a shear flow is present. An equivalent impedance with flow can be defined but it depends on the direction of the incident waves and loses its local characteristic.
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https://hal.archives-ouvertes.fr/hal-02512427
Contributeur : Yves Aurégan <>
Soumis le : jeudi 19 mars 2020 - 16:26:59
Dernière modification le : vendredi 18 décembre 2020 - 15:51:10

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Xiwen Dai, Yves Aurégan. Acoustic of a perforated liner with grazing flow: Floquet-Bloch periodical approach versus impedance continuous approach. Journal of the Acoustical Society of America, Acoustical Society of America, 2016, 140 (3), pp.2047-2055. ⟨10.1121/1.4962490⟩. ⟨hal-02512427⟩

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