Experimental observation of a hydrodynamic mode in a flow duct with a porous material

Y. Aurégan, D.K. Singh

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

This paper experimentally investigates the acoustic behavior of a homogeneous porous material with a rigid frame (metallic foam) under grazing flow. The transmission coefficient shows an unusual oscillation over a particular range of frequencies which reports the presence of an unstable hydrodynamic wave that can exchange energy with the acoustic waves. This coupling of acoustic and hydrodynamic waves becomes larger when the Mach number increases. A rise of the static pressure drop in the lined region is induced by an acoustic excitation when the hydrodynamic wave is present.
Original languageEnglish
Pages (from-to)567-572
Number of pages6
JournalJournal of the Acoustical Society of America
Volume136
Issue number2
DOIs
Publication statusPublished - 2014

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