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Experimental investigation of sound field decomposition with
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.ORCID iD: 0000-0001-8099-6554
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2016 (English)In: 22nd AIAA/CEAS Aeroacoustics Conference, 2016, American Institute of Aeronautics and Astronautics, 2016Conference paper (Refereed)
Abstract [en]

The DUct aCoustic Test rig with Rectangular cross section (DUCT-R) is designed at the German Aerospace Center (DLR), Engine Acoustics Department, to test commercial aircraft engine nacelle liner samples. An air flow with speed up to Mach 0.3 can be achieved in the liner section. An overall number of 106 microphone positions are spread over the rig, making it capable of investigating the scattering of the fundamental and higher order acoustic modes above the liner samples. In this paper, the DUCT-R facility is described. The measurement setups currently being used at DLR are introduced. In addition, a methodology for decomposing measured sound-field data with fundamental and higher order modes is described. The methodology is applied to data sets obtained from a “zero measurement” (a measurement without liner samples) with and without mean flows for validation purposes. The validation results are reported and discussed. © American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2016.
Keyword [en]
Acoustic field measurement, Acoustic fields, Acoustics, Aeroacoustics, Aircraft engines, Decomposition, Engines, Microphones, Oil well casings, Commercial aircraft, Experimental investigations, German aerospace centers, Higher-order modes, Measurement setup, Microphone positions, Rectangular cross-sections, Validation results, Ducts
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-194592ScopusID: 2-s2.0-84982918567ISBN: 9781624103865OAI: diva2:1044156
22nd AIAA/CEAS Aeroacoustics Conference, 2016, 30 May 2016 through 1 June 2016

Funding Details: FP7-PEOPLE-ITN-2012, EC, European Commission. QC 20161102

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

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