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Flow and Viscous Effects on Impedance Eduction

Weng, Chenyang and Schulz, Anita and Ronneberger, Dirk and Enghardt, Lars and Bake, Friedrich (2018) Flow and Viscous Effects on Impedance Eduction. AIAA Journal, 56 (3), pp. 1118-1132. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.J055838 ISSN 0001-1452

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Official URL: https://arc.aiaa.org/doi/abs/10.2514/1.J055838

Abstract

In principle, the impedance of a locally reacting acoustic liner should be independent of the structure of the sound field above the liner. Some experimental studies, however, have found that the impedance inversely determined by available eduction techniques is actually dependent on the direction of incident waves relative to the mean flow. This dependence has mainly been attributed to the incomplete description of flow physics in the eduction techniques, particularly to the neglect of the viscous effects. The purpose of the paper is to examine whether such a wave-direction dependence can be removed by including the flow physics that is absent in previous eduction techniques. To this end, two eduction methods using the full linearized Navier–Stokes equations are proposed. Possible turbulent effects are considered by using available turbulence models. The proposed eduction methods are applied to new measurement data and data available in the literature, and are compared with another eduction method that has been commonly used in the community. The results show that including viscous effects does not resolve the controversy on the apparent wave-direction dependence.

Item URL in elib:https://elib.dlr.de/120864/
Document Type:Article
Title:Flow and Viscous Effects on Impedance Eduction
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Weng, ChenyangDLR, AT-TRAUNSPECIFIED
Schulz, AnitaDLR, AT-TRAUNSPECIFIED
Ronneberger, DirkUni GöttingenUNSPECIFIED
Enghardt, LarsDLR, AT-TRAUNSPECIFIED
Bake, FriedrichFriedrich.Bake (at) dlr.dehttps://orcid.org/0000-0002-3235-428X
Date:March 2018
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:56
DOI :10.2514/1.J055838
Page Range:pp. 1118-1132
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Published
Keywords:Impedance Eduction, 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
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Bake, Dr.-Ing. Friedrich
Deposited On:09 Jul 2018 10:31
Last Modified:27 Aug 2018 08:33

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