elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Impendance Eduction Based on Microphone Measurements of Liners under Grazing Flow Conditions

Busse-Gerstengarbe, St. and Richter, Ch. and Thiele, F. and Enghardt, L. and Röhle, I. and Ferrante , P. and Scofano, A. (2012) Impendance Eduction Based on Microphone Measurements of Liners under Grazing Flow Conditions. AIAA Journal, 50 (4), pp. 867-879. American Institute of Aeronautics and Astronautics (AIAA). ISSN 0001-1452

Full text not available from this repository.

Abstract

This paper presents the results of insertion loss measurements and numerical impedance eduction of three different liner samples. An overview of the test rig and methodology is given, and preprocessed results in terms of reflection and transmission coefficients as well as the energy dissipation are discussed. these coefficients are calculated for discrete frequencies within the ivestigated frequency range. Subsequently, a numerical postprocessing is performed in the time domain, and the educed impedance function for each sample and flow Mach number is presented. This postprocessing in the time domain uses an impedance model based on the extended Helmholtz resonator with five free parameters. the parameters of the model are fitted via an optimization, which determines the whole frequency response in one optimization process. The comparison of measured and numerically evaluated energy coefficients proves the reliability of the tools for impedance evaluation under flow conditions. Finally, the impendance results of the different samples are discussed, including a comparative study with Aermacchi data of the National Aerospace Laboratory (The Netherlands) flow tube and Aermacchi impedance tube experiments

Item URL in elib:https://elib.dlr.de/77380/
Document Type:Article
Title:Impendance Eduction Based on Microphone Measurements of Liners under Grazing Flow Conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Busse-Gerstengarbe, St.Institut für Strömungstechnik und Technische Akustik, Technische Universität BerlinUNSPECIFIED
Richter, Ch.Institut für Strömungstechnik und Technische Akustik, Technische Universität BerlinUNSPECIFIED
Thiele, F.Institut für Strömungstechnik und Technische Akustik, Technische Universität BerlinUNSPECIFIED
Enghardt, L.UNSPECIFIEDUNSPECIFIED
Röhle, I.UNSPECIFIEDUNSPECIFIED
Ferrante , P.Alenia Aermacchi, ItalienUNSPECIFIED
Scofano, A.Alenia Aermacchi, ItalienUNSPECIFIED
Date:2012
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:50
Page Range:pp. 867-879
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Published
Keywords:Impedance eduction, dissipation, liner, DUCTS
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 11:00
Last Modified:08 Mar 2018 18:41

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.