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

Knobloch, Karsten and Neuhaus, Lars and Bake, Friedrich and Gaetani, P. and Persico, G. (2017) Experimental Assessment of Noise Generation and Transmission in a High-Pressure Transonic Turbine Stage. ASME Journal of Turbomachinery, 139 (10), pp. 1010061-10100612. American Society of Mechanical Engineers (ASME). doi: 10.1115/1.4036344. ISSN 0889-504X.

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Official URL: http://turbomachinery.asmedigitalcollection.asme.org/article.aspx?articleid=2615415&resultClick=3


Noise originating from the core of an aero-engine is challenging to quantify since the understanding of its generation and propagation is less advanced than that for noise sources of other engine components. To overcome the difficulties associated with dynamic measurements in the crowded core region, dedicated experiments have been set up in order to investigate mainly two processes: the propagation of direct combustion noise through the subsequent turbine stage, and the generation of indirect combustion noise by the passage of inhomogeneities of entropy and vorticity through the turbine stage. In the current work, a transonic turbine stage was exposed to isolated and well-characterized 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, the latter was found to be much lower than commonly assumed. The modal decomposition of the acoustic field in the upstream and downstream section shows additional modes besides the expected rotor-stator interaction modes. At the frequency of entropy or vorticity excitation, respectively, a significant increase of the overall sound power level was observed.

Item URL in elib:https://elib.dlr.de/113688/
Document Type:Article
Title:Experimental Assessment of Noise Generation and Transmission in a High-Pressure Transonic Turbine Stage
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Knobloch, KarstenUNSPECIFIEDhttps://orcid.org/0000-0002-3424-0809UNSPECIFIED
Bake, FriedrichUNSPECIFIEDhttps://orcid.org/0000-0002-3235-428XUNSPECIFIED
Gaetani, P.polytechnikum mailand, italienUNSPECIFIEDUNSPECIFIED
Persico, G.polytechnikum mailand, italienUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:ASME Journal of Turbomachinery
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1010061-10100612
Publisher:American Society of Mechanical Engineers (ASME)
Keywords:Entropy noise, Noise transmission, Turbine stage, indirect combustion noise, Sound propagation
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 (old)
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Knobloch, Dr. Karsten
Deposited On:21 Sep 2017 10:44
Last Modified:03 Nov 2023 14:09

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