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.
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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/ | ||||||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||||||
Title: | Impendance Eduction Based on Microphone Measurements of Liners under Grazing Flow Conditions | ||||||||||||||||||||||||
Authors: |
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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 |
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