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Radial mode analysis of broadband noise in flow ducts using a combined axial and azimuthal sensor array

Tapken, Ulf and Gutsche, Dominic and Enghardt, Lars (2014) Radial mode analysis of broadband noise in flow ducts using a combined axial and azimuthal sensor array. In: AIAA Aviation - 20th AIAA/CEAS Aeroacoustics Conference. 20th AIAA/CEAS Aeroacoustics Conference, 16.-20.06.2014, Atlanta, USA.

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Abstract

A method suited for the decomposition of broadband noise into duct modes is presented. The inverse method requires the application of only one circumferential ring in combination with an axial line array of microphones. In comparison to a reference array with multiple populated microphone rings specifically designed for a large-scale turbo-machinery test rig the new method reduces the amount of necessary measurement positions substantially. With the help of simulated measurements it is verified that - in case of fully uncorrelated modes - the method is accurate and delivers the same results as the reference method, which bases on the acquired data from the above mentioned reference array. The method delivers sound power estimates for each individual mode order. This enables a broader insight into the broadband noise generation mechanisms of turbo-machinery and, moreover, a more detailed assessment of noise reduction technologies.

Item URL in elib:https://elib.dlr.de/94652/
Document Type:Conference or Workshop Item (Speech)
Title:Radial mode analysis of broadband noise in flow ducts using a combined axial and azimuthal sensor array
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tapken, Ulfulf.tapken (at) dlr.deUNSPECIFIED
Gutsche, DominicUNSPECIFIEDUNSPECIFIED
Enghardt, LarsDLR, AT-TRAUNSPECIFIED
Date:June 2014
Journal or Publication Title:AIAA Aviation - 20th AIAA/CEAS Aeroacoustics Conference
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:acoustic measurement technique, duct acoustics, microphone array, broadband noise, turbomachinery
Event Title:20th AIAA/CEAS Aeroacoustics Conference
Event Location:Atlanta, USA
Event Type:international Conference
Event Dates:16.-20.06.2014
Organizer:AIAA / CEAS
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 - Fan and Compressor Technologies
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Tapken, Ulf
Deposited On:15 Jan 2015 15:10
Last Modified:15 Jan 2015 15:10

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