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Validation of an integrated acoustic absorber in a turbine exit guide vane

Broszat, D. and Tapken, U. and Enghardt, L. and Lengani, D. and Marn, A. (2011) Validation of an integrated acoustic absorber in a turbine exit guide vane. In: Proceedings 17th AIAA / CEAS Aeroacoustics Conference (32nd Aeroacoustics Conference). AIAA. 17th AIAA / CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference), 05.06. - 08.06.2011, Portland, USA.

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Within the scope of previous papers, the general setup of an acoustic turbine test facility at the Graz University of Technology has been presented. In addition, its significance for the validation of acoustic prediction tools and the verification of noise reduction features related to the LPT (Low Pressure Turbine) has been highlighted. In contrast to the passive noise reduction feature presented last year, the purpose of the present paper is the verification of an innovative integrated acoustic absorber. It considerably extends the available area for acoustic lining in the tailpipe downstream of the LPT by integrating it into the Turbine Exit Case (TEC). The innovative absorber has been acoustically designed for a maximum area utilization and tested at the above mentioned cold flow LPT rig. In parallel, numerical predictions based on the MTU in-house Linearized Euler (LEE) tool have been performed and compared to the results of the experimental investigations. The results show a very promising noise reduction potential of the integrated TEC absorber with a relatively broadband attenuation characteristic that allowed for a noticeable effect at all three acoustic operating conditions as well as the first and second Blade Passage Frequency (BPF). In addition, they, again, demonstrate the adequate correlation of the LEE predictions with the experimental data and its qualification as a design tool.

Document Type:Conference or Workshop Item (Paper)
Title:Validation of an integrated acoustic absorber in a turbine exit guide vane
AuthorsInstitution or Email of Authors
Broszat, D.MTU Aero Engines GmbH, München
Lengani, D.Technische Universität Graz, Graz, Österreich
Marn, A.Technische Universität Graz, Graz, Österreich
Journal or Publication Title:Proceedings 17th AIAA / CEAS Aeroacoustics Conference (32nd Aeroacoustics Conference)
Refereed publication:Yes
In ISI Web of Science:No
Keywords:turbo machinery, turbine noise, aeroacoustics, noise source identification, noise prediction, duct acoustics, acoustic absorber
Event Title:17th AIAA / CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference)
Event Location:Portland, USA
Event Type:international Conference
Event Dates:05.06. - 08.06.2011
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 - Fan and Compressor Technologies
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Balbir Kaur
Deposited On:20 Jan 2012 12:34
Last Modified:09 Feb 2012 15:57

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