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Acoustic Localization of Vane Faults in Turbomachinery Based on Source Modeling

Jürgens, Werner and Tapken, Ulf and Lemke, Olaf and Röhle, Ingo and Enghardt, Lars (2014) Acoustic Localization of Vane Faults in Turbomachinery Based on Source Modeling. In: AIAA Aviation - 20th AIAA/CEAS Aeroacoustics Conference. 20th AIAA/CEAS Aeroacoustics Conference, 16.-20.06.2014, Atlanta, USA.

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Abstract

The sound field in the annular duct of a one-stage turbine test-rig is investigated with the aim of detecting the location of stator vane faults. For this purpose, individual stator vanes are artificially damaged by a wedge-shaped cut out at the trailing edge of the vane. Shape and size of the cut out resemble typical vane burn-off faults. The sound field generated by the damaged stator row is measured inside the duct with an array of microphones. Subsequently, the acoustic far-field part of the sound is decomposed into a sum of radial-azimuthal, propagating eigenmodes. Comparison with the undamaged turbine stage reveals that the amplitudes of certain modes increase due to the damage. In order to localize the damaged vanes, the generating mechanism of stator-rotor interaction tones is modeled by lines of dipoles at the leading edge of the rotor blades. Using this model, we demonstrate that the location of the damaged vanes of a stator row can be detected successfully if the fault locations of a reference configuration are known.

Item URL in elib:https://elib.dlr.de/94653/
Document Type:Conference or Workshop Item (Speech)
Title:Acoustic Localization of Vane Faults in Turbomachinery Based on Source Modeling
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jürgens, WernerDLR, AT-TRAUNSPECIFIED
Tapken, Ulfulf.tapken (at) dlr.deUNSPECIFIED
Lemke, OlafUNSPECIFIEDUNSPECIFIED
Röhle, IngoUNSPECIFIEDUNSPECIFIED
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, noise source localization, detection of vane faults, 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 - Turbine Technologies, 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 15:11
Last Modified:15 Jan 2015 15:11

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