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Effects of Mean Flow Assumption and Harmonic Distortion on Impedance Eduction Methods

Jones, Michael G. and Watson, W. R. and Howerton, B. M. and Busse-Gerstengarbe, St. (2015) Effects of Mean Flow Assumption and Harmonic Distortion on Impedance Eduction Methods. AIAA Journal, pp. 1-12. American Institute of Aeronautics and Astronautics (AIAA). doi: http://dx.doi.org/10.2514/1.J053399. ISSN 0001-1452.

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This investigation uses methods based on the Pridmore-Brown and convected Helmholtz equations to study the acoustic behavior of a single-layer, conventional liner fabricated by DLR, German Aerospace Center and tested in the NASA Langley Grazing Flow Impedance Tube. Two key assumptions are explored in this investigation. First, a comparison of results achieved with uniform-flow and shear-flow impedance eduction methods is considered. Second, an approach based on the Prony method is used to extend these methods from single-mode to multimode implementations. In addition, a detailed study into the effects of harmonic distortion on the educed impedance is performed, and the results are used to develop guidelines regarding acceptable levels of harmonic distortion.

Item URL in elib:https://elib.dlr.de/94358/
Document Type:Article
Title:Effects of Mean Flow Assumption and Harmonic Distortion on Impedance Eduction Methods
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Jones, Michael G.NASA Langley Research Center, USAUNSPECIFIED
Watson, W. R.NASA Langley Research Center, USAUNSPECIFIED
Howerton, B. M.NASA Langley Research Center, USAUNSPECIFIED
Busse-Gerstengarbe, St.Institut für Strömungsmechanik und Technische Akustik, Technische Universität BerlinUNSPECIFIED
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-12
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Impedance eduction, harmonic distortion, liner, acoustic damping
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Bake, Dr.-Ing. Friedrich
Deposited On:15 Jan 2015 14:08
Last Modified:08 Mar 2018 18:42

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