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Comparison of the effect of flow direction on liner impedance using different measurement methods
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]

There is an ongoing scientific discussion about the effect of flow on experimental techniques for determination of acoustic liner impedance. This paper contributes to this continuing effort to gain confidence in results obtained under different acoustical and flow excitation configurations. A majority of the test rigs for determination of liner impedance including the effect of mean flow use plane wave excitation on the upstream side of the liner, but some studies have compared the results for downstream acoustic excitation. Especially for the so-called inverse impedance eduction techniques, it has been reported that different flow directions compared to the acoustic excitation can provide different educed impedances. It is still an open question if this results are due to the application of the Ingard-Myers boundary condition, to other errors or flaws in the measurements or a characteristic of the liner itself. This paper revisit some previous published results and compares the result obtained by means of inverse impedance eduction techniques, which in general adopt the Ingard-Myers boundary condition, and in-situ impedance measurements, which do not require the definition of a boundary condition. It is seen that discrepancies between downstream and upstream measurement can be observed in both approaches, and a discussion on such behavior is presented.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2017.
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216762Scopus ID: 2-s2.0-85023604736ISBN: 9781624105043 OAI: oai:DiVA.org:kth-216762DiVA, id: diva2:1152697
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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Citation style
  • apa
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  • nn-NB
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  • Other locale
More languages
Output format
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