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Spectral POD Analysis of Combustion Noise Emitted by a Non-reacting Combustor Simulator

D'Aniello, Raffaele and Gövert, Simon and Knobloch, Karsten and Kissner, Carolin Anja (2022) Spectral POD Analysis of Combustion Noise Emitted by a Non-reacting Combustor Simulator. In: Fortschritte der Akustik - DAGA 2022, pp. 1226-1229. Deutsche Gesellschaft für Akustik e.V. (DEGA). DAGA 2022 - 48. Jahrestagung für Akustik, 21.-24. März 2022, Stuttgart. ISBN 978-3-939296-20-1.

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Abstract

Combustion noise represents an important part of the overall emissions of gas turbines and aerospace engines. For modern lean combustors, there are several relevant physical phenomena which contribute to combustion noise, such as fluctuations of heat release in case of so-called direct combustion noise or acceleration of flow inhomogeneities in case of so-called indirect combustion noise. In order to describe the noise production mechanisms, it remains although difficult to distinguish between the different sources and to quantify the corresponding sound emission using classical approaches based on linear acoustics. This study therefore proposes an alternative method to identify the noise components based on an empirical mode decomposition technique, the so-called Spectral Proper Orthogonal Decomposition (SPOD). Using data extracted from a Large Eddy Simulation of a non-reacting combustor simulator, the suitability of the SPOD to identify the relationship between entropy disturbances due to cooling air entering the combustor and sound production was investigated. The comparison of the coherent structures obtained with the SPOD from entropy and pressure fluctuations clearly evidences similarities in spatial distributions and mode orders as well as energy peaks at similar frequencies. This makes the SPOD a promising approach to identify main features and structures of combustor noise components.

Item URL in elib:https://elib.dlr.de/186789/
Document Type:Conference or Workshop Item (Speech)
Title:Spectral POD Analysis of Combustion Noise Emitted by a Non-reacting Combustor Simulator
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
D'Aniello, RaffaeleRaffaele.Daniello (at) dlr.deUNSPECIFIED
Gövert, SimonSimon.Goevert (at) dlr.deUNSPECIFIED
Knobloch, KarstenKarsten.Knobloch (at) dlr.dehttps://orcid.org/0000-0002-3424-0809
Kissner, Carolin AnjaCarolin.Kissner (at) dlr.dehttps://orcid.org/0000-0003-1094-0939
Date:2022
Journal or Publication Title:Fortschritte der Akustik - DAGA 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1226-1229
Publisher:Deutsche Gesellschaft für Akustik e.V. (DEGA)
ISBN:978-3-939296-20-1
Status:Published
Keywords:Combustion Noise, Entropy noise, Spectral POD, FACTOR, CFD, Large-Eddy Simulation (LES), Modal Decomposition, Aeroacoustics
Event Title:DAGA 2022 - 48. Jahrestagung für Akustik
Event Location:Stuttgart
Event Type:international Conference
Event Dates:21.-24. März 2022
Organizer:Deutsche Gesellschaft für Akustik e.V. (DEGA)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Components and Emissions, L - Virtual Engine
Location: Berlin-Charlottenburg , Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Institute of Propulsion Technology > Combustor
Deposited By: D'Aniello, Raffaele
Deposited On:13 Jun 2022 12:26
Last Modified:17 Jun 2022 12:27

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