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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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.
|Title:||Numerical investigation of the fundamental mechanism for entropy noise generation in aero-engines and gas turbines|
|Journal or Publication Title:||Acta acustica united with Acustica|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 470-478|
|Keywords:||Entropy noise, Gas turbine|
|HGF - Research field:||Energy, Aeronautics, Space and Transport|
|HGF - Program:||Efficient Energy Conversion, Aeronautics|
|HGF - Program Themes:||E VG - Combustion and Gas Turbine Technologies, L VU - Air Traffic and Environment|
|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)|
|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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