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: 20th AIAA/CEAS Aeroacoustics Conference 2014. 20th AIAA/CEAS Aeroacoustics Conference, 2014-06-16 - 2014-06-20, Atlanta, USA. doi: 10.2514/6.2014-3318.
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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/ | ||||||||||||||||
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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: |
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Date: | June 2014 | ||||||||||||||||
Journal or Publication Title: | 20th AIAA/CEAS Aeroacoustics Conference 2014 | ||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||
Open Access: | No | ||||||||||||||||
Gold Open Access: | No | ||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||
DOI: | 10.2514/6.2014-3318 | ||||||||||||||||
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 Start Date: | 16 June 2014 | ||||||||||||||||
Event End Date: | 20 June 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 (old) | ||||||||||||||||
Location: | Berlin-Adlershof | ||||||||||||||||
Institutes and Institutions: | Institute of Propulsion Technology > Engine Acoustic | ||||||||||||||||
Deposited By: | Tapken, Dr. Ulf | ||||||||||||||||
Deposited On: | 15 Jan 2015 15:10 | ||||||||||||||||
Last Modified: | 24 Apr 2024 20:00 |
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