The problem of sound propagation near a lined wall taking into account mean shear flow effects and viscous and thermal dissipation is investigated. The method of composite expansion is used to separate the inviscid part, in the core of the flow, from the boundary layer part, near the wall. Two diffusion equations for the shear stress and the heat flux are obtained in the boundary layer. The matching of the solutions of these equations with the inviscid part leads to a modified specific acoustic admittance in the core flow. Depending on the ratio of the acoustic and stationary boundary layer thicknesses, the kinematic wall condition changes gradually from continuity of normal acoustic displacement to continuity of normal acoustic mass velocity. This wall condition can be applied in dissipative silencers and in aircraft engine-duct systems.
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January 2001
January 01 2001
Influence of grazing flow and dissipation effects on the acoustic boundary conditions at a lined wall Available to Purchase
Yves Aurégan;
Yves Aurégan
Laboratoire d’Acoustique de l’Université du Maine (I. A. M.), UMR CNRS 6613, Av. O Messiaen, 72085 Le Mans Cedex 9, France
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Rudolf Starobinski;
Rudolf Starobinski
Laboratoire d’Acoustique de l’Université du Maine (I. A. M.), UMR CNRS 6613, Av. O Messiaen, 72085 Le Mans Cedex 9, France
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Vincent Pagneux
Vincent Pagneux
Laboratoire d’Acoustique de l’Université du Maine (I. A. M.), UMR CNRS 6613, Av. O Messiaen, 72085 Le Mans Cedex 9, France
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Yves Aurégan
Laboratoire d’Acoustique de l’Université du Maine (I. A. M.), UMR CNRS 6613, Av. O Messiaen, 72085 Le Mans Cedex 9, France
Rudolf Starobinski
Laboratoire d’Acoustique de l’Université du Maine (I. A. M.), UMR CNRS 6613, Av. O Messiaen, 72085 Le Mans Cedex 9, France
Vincent Pagneux
Laboratoire d’Acoustique de l’Université du Maine (I. A. M.), UMR CNRS 6613, Av. O Messiaen, 72085 Le Mans Cedex 9, France
J. Acoust. Soc. Am. 109, 59–64 (2001)
Article history
Received:
July 26 1999
Accepted:
October 14 2000
Citation
Yves Aurégan, Rudolf Starobinski, Vincent Pagneux; Influence of grazing flow and dissipation effects on the acoustic boundary conditions at a lined wall. J. Acoust. Soc. Am. 1 January 2001; 109 (1): 59–64. https://doi.org/10.1121/1.1331678
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