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Advanced analysis of fan noise measurements supported by theoretical source models

Klähn, Lukas and Moreau, Antoine and Caldas, Luciano and Jaron, Robert and Tapken, Ulf (2022) Advanced analysis of fan noise measurements supported by theoretical source models. International Journal of Aeroacoustics. Sage Publications. ISSN 1475-472X.

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With the objective to improve the understanding of the dominant fan noise source mechanisms a comprehensive experimental study was conducted at a low speed fan test rig. The aerodynamic fan map as well as the acoustic characteristics of the fan were measured for a new blade integrated disk (Blisk) rotor with systematic variation of the shaft speed and throttling. The interpretation of the results is supported by simulations of the experiment with a physics based analytical in-house tool for fan noise prediction. For the acoustic measurements an array of wall-flushed microphones was used in the inlet section. By means of radial mode analysis techniques, the broadband and tonal sound powers are calculated for each operating point. In the obtained comprehensive database systematic variations of the tonal and broadband sound power with the flow rate are found. These patterns can only partly be correlated to the varying incidence angle of the rotor blades. Comparing the mode distributions of the measured noise and the analytical models then allows conclusions on the predominant noise sources of rotor-stator interaction and inflow-rotor interaction.

Item URL in elib:https://elib.dlr.de/147604/
Document Type:Article
Title:Advanced analysis of fan noise measurements supported by theoretical source models
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
Jaron, RobertRobert.Jaron (at) dlr.deUNSPECIFIED
Tapken, UlfUlf.Tapken (at) dlr.deUNSPECIFIED
Journal or Publication Title:International Journal of Aeroacoustics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:Sage Publications
Keywords:Fan noise, analytical prediction, radial mode analysis, microphone array measurements, inflow-rotor interaction, rotor-stator interaction
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:20 Dec 2021 08:48
Last Modified:20 Dec 2021 08:48

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