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Numerical investigation of the fundamental mechanism for entropy noise generation in aero-engines and gas turbines

Mühlbauer, Bernd and Noll, Berthold and Aigner, Manfred (2009) Numerical investigation of the fundamental mechanism for entropy noise generation in aero-engines and gas turbines. Acta acustica united with Acustica, 95, pp. 470-478. DOI: 10.3813/AAA.918171. ISSN 1610-1928.

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Official URL: http://www.ingentaconnect.com/content/dav/aaua/2009/00000095/00000003/art00010

Abstract

Abstract In the present work, the generation and propagation of entropy noise is computed using a compressible URANS approach in combination with appropriate acoustic boundary conditions. The Entropy Wave Generator (EWG) experiment is best suited for validating the proposed approach and for investigating the acoustic sources of entropy noise. The EWG involves a non-reactive tube flow, where entropy modes are imposed to an incoming air flow by using a heating module. The generated temperature non-uniformities are accelerated with the mean flow downstream in a convergent divergent nozzle, thus producing entropy noise. Simulation results of pressure fluctuations and their spectra for a defined standard configuration as well as for diff erent operating points of the EWG agree very well with the respective experimental data. Additionally, an analysis of the acoustic sources was performed. For this purpose the acoustic sources caused by the acceleration of density inhomogeneities were calculated. For the first time, a numerical method is introduced for the localization of the acoustic sources of entropy noise in acceleration/deceleration regions.

Document Type:Article
Title:Numerical investigation of the fundamental mechanism for entropy noise generation in aero-engines and gas turbines
Authors:
AuthorsInstitution or Email of Authors
Mühlbauer, BerndUNSPECIFIED
Noll, BertholdUNSPECIFIED
Aigner, ManfredUNSPECIFIED
Date:2009
Journal or Publication Title:Acta acustica united with Acustica
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:95
DOI:10.3813/AAA.918171
Page Range:pp. 470-478
ISSN:1610-1928
Status:Published
Keywords:Entropy noise, Gas turbine
HGF - Research field:Energy, Aeronautics, Space and Transport
HGF - Program:Efficient Energy Conversion (old), Aeronautics
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old), L VU - Air Traffic and Environment (old)
DLR - Research area:Energy, Aeronautics
DLR - Program:E VG - Combustion and Gas Turbine Technologies, L VU - Air Traffic and Environment
DLR - Research theme (Project):E - Gasturbine (old), L - Quiet Air Traffic (old)
Location: Stuttgart
Institutes and Institutions:Institute of Combustion Technology > Numerical Simulation
Deposited By: Dr. Klaus Peter Geigle
Deposited On:30 Jun 2009 09:50
Last Modified:07 Feb 2013 19:39

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