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Assessment of in-duct fan broadband noise measurements in a modern low-speed test rig

Klähn, Lukas and Moreau, Antoine and Caldas, Luciano and Tapken, Ulf (2022) Assessment of in-duct fan broadband noise measurements in a modern low-speed test rig. In: International Conference of Fan Noise, Aerodynamics, Applications and Systems 2022. International Conference of Fan Noise, Aerodynamics, Applications and Systems 2022, 06.-06. Apr. 2022, Senlis, Frankreich. (Submitted)

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Abstract

The rotor-incoherent components of the sound field emitted by a fan stage in an aeroacoustic fan test rig are analyzed by means of a radial mode analysis with a combined axial and azimuthal sensor array. The resulting sound power is separated into broadband components and narrowband components around the blade passing frequencies, which are not to be confused with pure tones. The trends of the broadband components are linked to the blade loading and flow coefficient. The narrowband components, that are associated with elongated ingested turbulence, are reduced by a honeycomb. Measurements are compared to simulated data obtained from a physics based analytical noise prediction model and to results obtained for a different test rig.

Item URL in elib:https://elib.dlr.de/147609/
Document Type:Conference or Workshop Item (Speech)
Title:Assessment of in-duct fan broadband noise measurements in a modern low-speed test rig
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Klähn, LukasLukas.Klaehn (at) dlr.dehttps://orcid.org/0000-0002-1425-4453
Moreau, Antoineantoine.moreau (at) dlr.deUNSPECIFIED
Caldas, LucianoLuciano.Caldas (at) dlr.deUNSPECIFIED
Tapken, UlfUlf.Tapken (at) dlr.deUNSPECIFIED
Date:2022
Journal or Publication Title:International Conference of Fan Noise, Aerodynamics, Applications and Systems 2022
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Submitted
Keywords:Fan noise, test rig, noise prediction method, rotor-incoherent noise, broadband noise, turbulence
Event Title:International Conference of Fan Noise, Aerodynamics, Applications and Systems 2022
Event Location:Senlis, Frankreich
Event Type:international Conference
Event Dates:06.-06. Apr. 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Future Engines and Engine Integration
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology
Deposited By: Klähn, Lukas
Deposited On:05 Jan 2022 15:27
Last Modified:05 Jan 2022 15:27

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