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A mode-matching model for the impedance of perforated plate liners


A mode-matching model applicable to perforated liners in the linear regime is presented.It complements semi-empirical models not suitable for the high frequency regime, for linerfeaturing thick plate and micro perforated liner. The mentioned models are compared to mea-surements. From these comparisons, it appears that removing the short tube approximationis not enough to capture completely the losses in the linear regime. Further investigations havebeen carried out using a finite element method model based on compressible Linearised Navier-Stokes equations. This method showed to be in good agreement with experimental data. Thus,the dissipation due to viscosity was mapped around the aperture. This approach is supposedto provide a more precise understanding of the physical phenomenon of interest. Based onthose results, the next step is to propose an upgraded mode-matching model computationallyefficient that overtakes empirical models thanks to physical-based modeling.
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hal-02335914 , version 1 (28-10-2019)



Robin Billard, Gilles Tissot, Gwenael Gabard, Marc Versaevel, Jean-Philippe Groby. A mode-matching model for the impedance of perforated plate liners. Aeroacoustics 2019 - 25th AIAA/CEAS Aeroacoustics Conference, May 2019, Delft, Netherlands. pp.1-12, ⟨10.2514/6.2019-2702⟩. ⟨hal-02335914⟩
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