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On the effect of boundary conditions on impedance eduction results
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2017 (English)In: 23rd AIAA/CEAS Aeroacoustics Conference, 2017, American Institute of Aeronautics and Astronautics, 2017Conference paper (Refereed)
Abstract [en]

The acoustic impedance determination of liners remains a challenging task. Recent works have shown that different experimental procedures may lead to different impedance results. Since the acoustic impedance is a key parameter related to the absorption coefficient, it must be correctly measured. The experimental techniques can be divided in two categories: in-situ and inverse methods. In general, the latter assume, in the presence of a mean flow, an infinitely small boundary layer over the liner surface i.e. the so called Ingard-Myers boundary condition. More recent boundary conditions have been proposed that include a small but finite boundary layer. In this paper, the Brambley boundary condition is implemented for a mode matching method, whereas a shear flow profile is considered in a straightforward method. The educed impedances for different liners and flow velocities are compared and the results are discussed.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2017.
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216748Scopus ID: 2-s2.0-85023628380ISBN: 9781624105043 OAI: oai:DiVA.org:kth-216748DiVA, id: diva2:1152703
Conference
23rd AIAA/CEAS Aeroacoustics Conference, 2017, Denver, United States, 5 June 2017 through 9 June 2017
Note

QC 20171026

Available from: 2017-10-26 Created: 2017-10-26 Last updated: 2017-10-26Bibliographically approved

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