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Cyclostationary analysis of fan noise influenced by an inflow control device

Grizewski, Larisa and Behn, Maximilian and Funke, Stefan and Siller, Henri (2021) Cyclostationary analysis of fan noise influenced by an inflow control device. AIAA Journal. American Institute of Aeronautics and Astronautics (AIAA). ISSN 0001-1452.

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Abstract

Acoustic data measured in a fan test facility with and without an inflow control device (ICD) over the inlet were analyzed using the cyclostationary analysis technique, which separates the total power into a rotor locked and a fluctuating component. Measurements were taken with an inlet mode detection ring upstream of the rotor and with far-field microphones for configurations with subsonic and with supersonic fan blade tip speeds. The ICD reduces the fluctuating component and stabilizes the rotor locked component of the frequency spectrum at the blade passing frequency and its harmonics in the way that the mode amplitudes of the Tyler-Sofrin modes increase, while neighboring mode orders are suppressed. The mode distribution and inter-mode coherence in the inlet are also changed, which changes the far-field directivity when an ICD is installed. It is demonstrated that cyclostationary analysis is a powerful tool to investigate the acoustic effect of an ICD on turbofan noise, revealing more details about the temporal and spatial structure of the generated sound field than a classical spectral analysis.

Item URL in elib:https://elib.dlr.de/140395/
Document Type:Article
Title:Cyclostationary analysis of fan noise influenced by an inflow control device
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Grizewski, LarisaLarisa.Grizewski (at) dlr.deUNSPECIFIED
Behn, MaximilianMaximilian.Behn (at) dlr.dehttps://orcid.org/0000-0001-8478-8269
Funke, StefanStefan.Funke (at) rolls-royce.comUNSPECIFIED
Siller, HenriHenri.Siller (at) dlr.deUNSPECIFIED
Date:2021
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Accepted
Keywords:Acoustic analysis, rotating machinery, inlet control device, turbulence control screen, cyclostationary analysis
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 - Virtual Engine and Validation methods (old)
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Siller, Henri
Deposited On:13 Jan 2021 14:17
Last Modified:11 Mar 2021 16:43

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