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Experimental Assessment of Noise Generation and Transmission in a High-Pressure Transonic Turbine Stage

Knobloch, Karsten and Neuhaus, L. and Gaetani, P. and Persico, G. and Bake, Friedrich (2016) Experimental Assessment of Noise Generation and Transmission in a High-Pressure Transonic Turbine Stage. In: Proceedings of ASME 2016 Turbo Expo: Turbine Technical Conference and Exposition (GT2016-57209). ASME 2016 Turbo Expo: Turbomachinery Technical Conference and Exposition, 13.-17. Jun. 2016, Seoul, South Korea.

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Abstract

The noise originating from the core of an aero-engine is usually difficult to quantify and the knowledge about its Generation and propagation is less advanced than that for other engine components. In order to overcome the difficulties associated with dynamic measurements in the crowded core region, dedicated experiments have been set up in order to investigate the processes associated with the generation of noise in the combustor, its propagation through the turbine and the interaction of these two components, which may produce additional - so-called indirect combustion-noise. In the current work, a transonic turbine stage installed at the Laboratorio di Fluidodinamica delle Macchine of the Politechnico di Milano was exposed to acoustic, entropic, and vortical disturbances. The incoming and outgoing sound fields were analyzed in detail by two large arrays of microphones. The mean flow field and the disturbances were carefully mapped by several aerodynamic and thermal probes. The results include transmission and reflection characteristics of the turbine stage, latter one was found to be much lower than usually assumed. The modal decomposition of the acoustic field in the upstream and downstream section show beside the expected rotor-stator interaction modes additional modes. At the frequency of entropy or respectively vorticity excitation, a significant increase of the overall sound power level was observed.

Item URL in elib:https://elib.dlr.de/105436/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental Assessment of Noise Generation and Transmission in a High-Pressure Transonic Turbine Stage
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knobloch, KarstenDLR, AT-TRAUNSPECIFIED
Neuhaus, L.DLR, AT-TRAUNSPECIFIED
Gaetani, P.Polytechnikum Mailand, ItalienUNSPECIFIED
Persico, G.Polytechnikum Mailand, ItalienUNSPECIFIED
Bake, FriedrichDLR, AT-TRAUNSPECIFIED
Date:June 2016
Journal or Publication Title:Proceedings of ASME 2016 Turbo Expo: Turbine Technical Conference and Exposition (GT2016-57209)
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:indirect combsution noise, sound propagation, turbine
Event Title:ASME 2016 Turbo Expo: Turbomachinery Technical Conference and Exposition
Event Location:Seoul, South Korea
Event Type:international Conference
Event Dates:13.-17. Jun. 2016
Organizer:ASME - International Gas Turbine Institute
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
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Knobloch, Dr. Karsten
Deposited On:27 Jul 2016 08:22
Last Modified:27 Jul 2016 08:22

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