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On the use of a Stress-Impedance Model to describe sound propagation in a lined duct with grazing flow

Abstract : With flow, the acoustic effect of a locally reacting lined wall cannot be described by a single quantity independent of the incident wave, such as a wall impedance. At least two quantities, intrinsic to the liner and to the flow, are required to describe the effect of the lined wall regardless of the incident wave. In addition to the impedance, the unsteady tangential force exerted by the wall on the flow has to be taken into account. This force is due either to viscous effects or to the unsteady transfer of axial momentum from the flow into the lined wall. The paper describes a Stress-Impedance model where the two variables used are the impedance and the friction factor that links the pressure to a tangential stress at the wall. The use of a wall stress helps to better understand the mechanisms of momentum transfer between the flow and the wall in the vicinity of an acoustic treatment.
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https://hal-univ-lemans.archives-ouvertes.fr/hal-01937207
Contributeur : Yves Aurégan <>
Soumis le : mercredi 28 novembre 2018 - 08:30:56
Dernière modification le : mardi 12 novembre 2019 - 17:38:02

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Yves Aurégan. On the use of a Stress-Impedance Model to describe sound propagation in a lined duct with grazing flow. Journal of the Acoustical Society of America, Acoustical Society of America, 2018, 143 (5), pp.2975 - 2979. ⟨10.1121/1.5037585⟩. ⟨hal-01937207⟩

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