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EFFECT OF FLOW DIRECTION ON ACOUSTIC LINER IMPEDANCE MEASUREMENT RESULTS
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2016 (English)In: PROCEEDINGS OF THE 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
2016.
Series
Proceedings of the International Congress on Sound and Vibration, ISSN 2329-3675
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-203200ISI: 000388480401070ISBN: 978-960-99226-2-3 OAI: oai:DiVA.org:kth-203200DiVA: diva2:1081269
Conference
23rd International Congress on Sound and Vibration (ICSV), JUL 10-14, 2016, Athens, GREECE
Note

Qc 20170313

Available from: 2017-03-13 Created: 2017-03-13 Last updated: 2017-03-13Bibliographically approved

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