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Effect of flow direction on acoustic liner impedance measurement results
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-8474-8563
2016 (English)In: ICSV 2016 - 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics, 2016Conference paper (Refereed)
Abstract [en]

The last twenty years have seen a large development in inverse techniques for the determination of liner impedance under grazing flow conditions, so called impedance eduction techniques. This paper contributes to a continuing effort to gain confidence in results obtained under different acoustical excitation configurations. Many test rigs for determination of liner impedance including the effect of mean flow use plane wave excitation on the upstream side of the liner. Some studies has compared the result for downstream acoustic excitation and found that different acoustic impedances are obtained in the two cases. It is still an open question if this result is due to the application of the Ingard-Myers boundary condition or to other errors or flaws in the measurements. This paper collects data available in the literature to see if the trend of obtaining different results for upstream and downstream excitation is persistent.

Place, publisher, year, edition, pages
Keyword [en]
Safety engineering, Vibrations (mechanical), Acoustic excitation, Acoustic liners, Acoustical excitation, Flow direction, Impedance eduction, Inverse techniques, Liner impedance, Plane wave excitation, Acoustic impedance
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-194617ScopusID: 2-s2.0-84987926825ISBN: 9789609922623OAI: diva2:1043836
23rd International Congress on Sound and Vibration, ICSV 2016, 10 July 2016 through 14 July 2016

Conference Paper. QC 20161101

Available from: 2016-11-01 Created: 2016-10-31 Last updated: 2016-11-02Bibliographically approved

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