14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference) 2008
DOI: 10.2514/6.2008-2879
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Models for Acoustically-Lined Turbofan Ducts

Edward Brambley

Abstract: Several models have recently been proposed for the impedance response of an acoustic lining; most recently, Rienstra's Enhanced Helmholtz Resonator model. All of these models have stability issues with nonzero mean flow, and there has been some debate over the existence of hydrodynamic instability waves over the surface of such acoustic linings. Mathematically, the standard proven Briggs-Bers stability analysis is not applicable. Computationally, the hydrodynamic modes are routinely ignored (in the frequency d… Show more

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Cited by 4 publications
(2 citation statements)
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“…For a long time, however, there has been doubts [5,6,7] about a particular wave mode that exists along a lined wall with flow and the Ingard-Myers condition. This mode has some similarities with the Kelvin-Helmholtz instability of a free vortex sheet [8] and may therefore represent an instability, although the analysis is mathematically subtle [9,10,11,12].…”
Section: Introductionmentioning
confidence: 99%
“…For a long time, however, there has been doubts [5,6,7] about a particular wave mode that exists along a lined wall with flow and the Ingard-Myers condition. This mode has some similarities with the Kelvin-Helmholtz instability of a free vortex sheet [8] and may therefore represent an instability, although the analysis is mathematically subtle [9,10,11,12].…”
Section: Introductionmentioning
confidence: 99%
“…Aurégan & Renou 25 experimentally evidenced the failure of Myers' boundary condition to retrieve proper impedance values in the context of impedance eduction. In parallel, Brambley 26 analytically highlighted some stability issues inherent to Myers' boundary condition. Consequently, several alternative models have been proposed to improve this boundary condition.…”
Section: Liner Casementioning
confidence: 99%