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Communication Dans Un Congrès Année : 2015

A broadband method for liner impedance eduction in the presence of a mean flow

Résumé

In this study, a broadband impedance eduction method is developed to identify the surface impedance of acoustic liners, mounted in the walls of aircraft engine nacelles, from measurements on a test rig. A numerical model of an acoustic liner under a grazing flow is undertaken by considering finite-difference time-domain simulations and the Euler equations for the acoustic propagation. A broadband impedance model is used to prescribe time-domain boundary conditions. The impedance eduction procedure is established using an multiobjective optimization with the genetic algorithm NSGA-II. The pressure is measured at six positions in the duct for each considered frequency. The present methodology is validated by comparison with benchmark data provided by NASA.
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Dates et versions

hal-03446549 , version 1 (24-11-2021)

Identifiants

  • HAL Id : hal-03446549 , version 1

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Renata Troian, Didier Dragna, Christophe Bailly, Marie-Annick Galland. A broadband method for liner impedance eduction in the presence of a mean flow. CFM 2015 - 22ème Congrès Français de Mécanique, Aug 2015, Lyon, France. ⟨hal-03446549⟩
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