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Determination of the impedance for lined ducts with grazing flow

Enghardt, L. and Fischer, A. and Schulz, A. and Busse-Gerstengarbe, St. (2012) Determination of the impedance for lined ducts with grazing flow. In: Proceedings 18th AIAA / CEAS Aeroacoustics Conference (33rd Aeroacoustics Conference), Vol. 1 of 5. 18th AIAA/CEA Aeroacoustics Conference, 04. Juni - 06. Juni 2012, Colorado Springs, USA. ISBN 978-1-62276-215-6

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Abstract

Passive means of acoustically damping devices like perforates or - more generally - liners play an important role in industrial applications to protect the community e.g against power plant noise´. In aero-engines, Helmholtz resonator type liners serve as substantial noise abatement means in regions of cold flow. An important physical property to characterize lining devices is the impedance. Several impedance eduction methods exist in literature, most of which are mathematically complicated or need substantial computation time. This paper presents a new impedance eduction method, which is relatively simple to apply, robust, and cheap in terms of computational effort. The method is derived and validated with NASA benchmark data. Its accuracy and applicability is demonstrated and approved.

Item URL in elib:https://elib.dlr.de/77525/
Document Type:Conference or Workshop Item (Speech)
Title:Determination of the impedance for lined ducts with grazing flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Enghardt, L.UNSPECIFIEDUNSPECIFIED
Fischer, A.UNSPECIFIEDUNSPECIFIED
Schulz, A.Institut für Strömungsmechanik und Technische Akustik, Technische Universität BerlinUNSPECIFIED
Busse-Gerstengarbe, St.Institut für Strömungsmechanik und Technische Akustik, Technische Universität BerlinUNSPECIFIED
Date:2012
Journal or Publication Title:Proceedings 18th AIAA / CEAS Aeroacoustics Conference (33rd Aeroacoustics Conference)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:Vol. 1 of 5
ISBN:978-1-62276-215-6
Status:Published
Keywords:Liner, Semi-analytical, APIV, LINUS, PIANO, CAA
Event Title:18th AIAA/CEA Aeroacoustics Conference
Event Location:Colorado Springs, USA
Event Type:international Conference
Event Dates:04. Juni - 06. Juni 2012
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Kaur, Balbir
Deposited On:10 Jan 2013 10:57
Last Modified:10 Jan 2013 10:57

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