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Modal Analysis of Direct Core Noise in a Model Combustor

O'Brian, Jeffrey and Bake, Friedrich and Ihme, Matthias (2017) Modal Analysis of Direct Core Noise in a Model Combustor. 10th U.S. National Combustion Meeting, April 23–26, 2017, College Park, Maryland, USA.

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Abstract

Combustion noise is a growing concern for gas turbine designers, especially the presence of prominent tonal structures or thermoacoustic instabilities. High fidelity simulations such as compressible large eddy simulation (LES) have demonstrated great potential in predicting the behavior of these reacting flows, but these methods generate massive amounts of data and efficient techniques are required to isolate the behavior and underlying physics of acoustic structures. Multiple modaldecomposition techniques have gained prominence across a variety of fields for identifying the underlying dynamics of complex systems, including the fast Fourier Transform (FFT), proper orthogonal decomposition (POD), and dynamic mode decomposition (DMD). Here, these three techniques are applied to the pressure field taken from a compressible LES of a gas turbine model combustor (GTMC). Comparisons are made between the structures identified by each algorithm as well as the capacity of each technique to identify mode amplitude and assign cardinality to the modes. Lastly, comments are offered about the advantages and disadvantages, including robustness, of the methods studied.

Item URL in elib:https://elib.dlr.de/113381/
Document Type:Conference or Workshop Item (Speech)
Title:Modal Analysis of Direct Core Noise in a Model Combustor
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
O'Brian, JeffreyCTR - Stanford UniversityUNSPECIFIED
Bake, FriedrichFriedrich.Bake (at) dlr.dehttps://orcid.org/0000-0002-3235-428X
Ihme, Matthiasstanford university - center for turbulence researchUNSPECIFIED
Date:2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Core noise, acoustics, modal analysis, thermoacoustics
Event Title:10th U.S. National Combustion Meeting
Event Location:College Park, Maryland, USA
Event Type:international Conference
Event Dates:April 23–26, 2017
Organizer:Combustion Institute
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 - Combustion Chamber Technologies
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Bake, Dr.-Ing. Friedrich
Deposited On:21 Sep 2017 10:35
Last Modified:21 Sep 2017 10:35

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