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dc.contributor.author
Pedergnana, Tiemo
dc.contributor.author
Noiray, Nicolas
dc.date.accessioned
2022-10-07T11:37:55Z
dc.date.available
2022-09-20T08:41:47Z
dc.date.available
2022-09-23T12:18:45Z
dc.date.available
2022-10-07T11:37:55Z
dc.date.issued
2022
dc.identifier.isbn
978-1-906913-42-7
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/571632
dc.description.abstract
We present a unified, physics-based low-order modeling approach to can-annular combustors, combining a linear stability analysis and a nonlinear Langevin approach to unravel the highly complex, multi-physical dynamics in this type of system. In the linear part, Howe’s Rayleigh conductivity model is combined with the projected Helmholtz equation and a Bloch wave ansatz to arrive at a single equation for the frequency spectrum of an N-can combustor. Starting from first principles, we illustrate and give a physical explanation for the coupling-induced amplification and suppression of thermoacoustic instabilities. Adding another layer of complexity, we then take into account nonlinearities in the flame response and the aeroacoustic coupling. The nonlinear dynamics of a symmetric model combustor are explored by exploiting the gradient structure of the averaged slow-flow dynamics. We obtain exact analytical expressions for the steady-state statistics, highlighting the connection between different emergent patterns and the resistive coupling between the cans. We leverage our analysis to explain the intermittent energy transfer between Bloch modes observed in real-world gas turbines.
en_US
dc.language.iso
en
en_US
dc.publisher
International Institute of Noise Control Engineering
en_US
dc.subject
Thermoacoustics
en_US
dc.subject
Nonlinear dynamics
en_US
dc.subject
Aeroacoustic instability
en_US
dc.title
Unified approach to low-order modeling of can-annular combustors
en_US
dc.type
Conference Paper
ethz.book.title
Proceedings Internoise 2022
en_US
ethz.pages.start
509
en_US
ethz.size
8 p.
en_US
ethz.event
51st International Congress and Exposition on Noise Control Engineering (Internoise 2022)
en_US
ethz.event.location
Glasgow, United Kingdom
en_US
ethz.event.date
August 21–24, 2022
en_US
ethz.notes
Conference lecture held on August 22, 2022.
en_US
ethz.grant
Thermoakustische Instabilitäten in Rohr-Ringbrennkammern
en_US
ethz.publication.place
Reston, VA
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02668 - Inst. f. Energie- und Verfahrenstechnik / Inst. Energy and Process Engineering::09471 - Noiray, Nicolas / Noiray, Nicolas
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02130 - Dep. Maschinenbau und Verfahrenstechnik / Dep. of Mechanical and Process Eng.::02668 - Inst. f. Energie- und Verfahrenstechnik / Inst. Energy and Process Engineering::09471 - Noiray, Nicolas / Noiray, Nicolas
en_US
ethz.grant.agreementno
184617
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Projekte MINT
ethz.date.deposited
2022-09-20T08:41:53Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2022-10-07T11:37:56Z
ethz.rosetta.lastUpdated
2023-02-07T06:58:58Z
ethz.rosetta.versionExported
true
ethz.COinS
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