Nonlinear broadband time-domain admittance boundary condition applied to a flow duct with perforated liner - Ecole Nationale des Travaux Publics de l'Etat
Communication Dans Un Congrès Année : 2023

Nonlinear broadband time-domain admittance boundary condition applied to a flow duct with perforated liner

Résumé

Perforated plates experience a nonlinear response at high excitation levels. They are largely used in duct applications, such as aircraft engine nacelles, for which broadband noise and the presence of flow must be considered. Time-domain methods are well-suited to predict sound propagation under such conditions. Recently, a timedomain admittance boundary condition (TDABC) was proposed by Diab et al. (J. Sound. Vib., 528, 2022) [1] to account for the nonlinear response of perforated plates and was implemented in a finite difference time-domain solver of the linearized Euler equations. A numerical study on sound propagation in a lined duct was performed in the absence of flow. This paper extends the TDABC to a lined duct with flow. First, the time-domain model is experimentally validated with a perforated plate placed in an impedance tube at normal incidence. Second, a flow duct lined with the perforated plate is considered. Numerical simulations are performed to evaluate noise reduction due to the liner for several incident sound pressure levels. Subsequently, experiments are carried out in the Caïman wind-tunnel of Ecole Centrale de Lyon and the experimental and numerical results are compared.

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Dates et versions

hal-04694589 , version 1 (11-09-2024)

Identifiants

Citer

Emanuele Sarpero, Didier Dragna, Emmanuel Gourdon, M.-A. Galland. Nonlinear broadband time-domain admittance boundary condition applied to a flow duct with perforated liner. 10th Convention of the European Acoustics Association Forum Acusticum 2023, Sep 2023, Turin, France. pp.5945-5948, ⟨10.61782/fa.2023.0086⟩. ⟨hal-04694589⟩
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