Direct Time-Domain Eduction of Acoustic Liner Impedance in Turbulent Grazing Flows.

Rémi Roncen¹, Ludovic Ambrosiani^1,2, Angelo Paduano², Francesco Avallone², Fabien Méry¹, Estelle Piot¹

¹DMPE, ONERA, Université de Toulouse, 31000, Toulouse, France.

²Department of Mechanical and Aerospace Engineering, Polytechnic of Turin, Turin, Italy.

Abstract

Acoustic liners are passive sound-absorbing materials widely used in engineering applications and are commonly characterised by their acoustic impedance. In the presence of high sound pressure levels or grazing flows, the impedance is modified by local nonlinear effects. Conventional impedance measurements are typically obtained through frequency-domain eduction techniques, which infer impedance f…

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