In this study, the acoustic performance of the liner characteristics coupled with geometric discontinuities on the acoustic attenuation of a lined duct is investigated. The model is based on the computation of the scattering matrix. The liner is composed of a perforated plate with an air cavity backed by a rigid wall plate. The parametric study was conducted for six configurations, including cases of sudden or progressive narrowing and widening of the duct radius. The numerical results show the relative influence of the variation of each parameter, and of each type of radius discontinuities of ducts on the acoustic power attenuation.
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Chaâbane et al. (2022) studied this question.
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