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A general acoustic framework for the assessment of noise emitted by combustors: a first case study

D'Aniello, Raffaele and Gövert, Simon and Knobloch, Karsten and Kissner, Carolin Anja (2023) A general acoustic framework for the assessment of noise emitted by combustors: a first case study. Journal of Sound and Vibration, 562, p. 117846. Elsevier. doi: 10.1016/j.jsv.2023.117846. ISSN 0022-460X.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0022460X2300295X

Abstract

This study proposes an alternative and general framework for the assessment of the sound generated within a combustion chamber. The novel approach is based on Doak's Momentum Potential Theory and combines the advantage of using the single assumption of a time-stationary fluctuating flow with a clear separation of turbulent, thermal and acoustic dynamics. The latter can furthermore be quantified by defining a generalised acoustic variable, which can be identified in the fluctuations of the stagnation enthalpy. The proposed model provides a new and more comprehensive explanation for the generation of combustion noise and is used here for the first time to analyse the acoustic properties of the turbulent and non-isentropic flow in a simplified combustion chamber, represented by LES data of a non-reacting combustor simulator. The application highlights the ability of the model to identify and clearly separate the main dynamical effects characteristic for the flow. Finally, the acoustic production can be quantified using the concept of the generalised acoustic field and related to the turbulent dynamics, which seems to represent the major acoustic generation mechanism for the considered setup.

Item URL in elib:https://elib.dlr.de/200721/
Document Type:Article
Title:A general acoustic framework for the assessment of noise emitted by combustors: a first case study
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
D'Aniello, RaffaeleUNSPECIFIEDhttps://orcid.org/0000-0003-1601-1356148465222
Gövert, SimonUNSPECIFIEDhttps://orcid.org/0000-0003-4593-1776UNSPECIFIED
Knobloch, KarstenUNSPECIFIEDhttps://orcid.org/0000-0002-3424-0809UNSPECIFIED
Kissner, Carolin AnjaUNSPECIFIEDhttps://orcid.org/0000-0003-1094-0939UNSPECIFIED
Date:13 October 2023
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:562
DOI:10.1016/j.jsv.2023.117846
Page Range:p. 117846
Publisher:Elsevier
ISSN:0022-460X
Status:Published
Keywords:combustion noise, momentum potential theory (MPT), thermoacoustics, entropy noise, vorticity noise, large-eddy simulation (LES)
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 - Aircraft Technologies and Integration
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Institute of Propulsion Technology > Combustor
Deposited By: D'Aniello, Raffaele
Deposited On:11 Dec 2023 09:14
Last Modified:11 Dec 2023 09:14

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