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dc.contributor.author
Benekos, Sotirios
dc.contributor.author
Frouzakis, Christos E.
dc.contributor.author
Giannakopoulos, George K.
dc.contributor.author
Altantzis, Christos
dc.contributor.author
Boulouchos, Konstantinos
dc.date.accessioned
2021-02-25T09:07:44Z
dc.date.available
2020-12-05T03:49:19Z
dc.date.available
2020-12-07T16:19:16Z
dc.date.available
2021-02-25T09:07:44Z
dc.date.issued
2021-03
dc.identifier.other
10.1016/j.combustflame.2020.10.045
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/454787
dc.identifier.doi
10.3929/ethz-b-000454787
dc.description.abstract
A parametric direct numerical simulation study was conducted to investigate the effects of the initial flow field (quiescent or turbulent), nozzle inlet sharpness and width, main chamber composition (lean and stoichiometric), and ignition kernel placement in a two-dimensional prechamber (PC) ignition system. The strongly coupled operating and geometric parameters determine the time at which the flame exits the prechamber, the transient structure and penetration of the initially cold and subsequently hot reactive jet and their impingement on the lower main chamber (MC) wall, affecting the combustion mode and the fuel consumption rate. The temperature of the flame reaching and crossing the nozzle is affected by the flame exit time and is significantly lower than the adiabatic flame temperature of the planar flame, although no quenching is observed. Interaction with the flow field (strong small scale vortices for narrow and sharp entry nozzles, large vortices for wide nozzles) generated close to the exit increases the surface area of the flame and its interaction with the MC mixture. Jet penetration and impingement on the lower MC wall is determined by combustion in the PC and the flow field it generates in the main chamber. Impingement results in large scale vortical structures, which further contribute to the flame area increase and accelerate the consumption of the MC charge at later times. For the conditions studied, budget analysis shows that the main combustion mode is premixed deflagration with locally enhanced or reduced reactivity. Local flame–flame interactions which are more pronounced close to the nozzle exit and the lower MC wall can increase the propagation speed up to six times compared to the planar flame. The evolution of the probability density functions of different quantities is used to characterize the strongly transient process. © 2020 The Combustion Institute.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject
Turbulent jet ignition
en_US
dc.subject
Prechamber ignition
en_US
dc.subject
Natural gas engines
en_US
dc.subject
Methane combustion
en_US
dc.subject
Direct numerical simulation
en_US
dc.title
A 2-D DNS study of the effects of nozzle geometry, ignition kernel placement and initial turbulence on prechamber ignition
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2020-11-13
ethz.journal.title
Combustion and Flame
ethz.journal.volume
225
en_US
ethz.pages.start
272
en_US
ethz.pages.end
290
en_US
ethz.size
19 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
New York, NY
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::03611 - Boulouchos, Konstantinos (emeritus) / Boulouchos, Konstantinos (emeritus)
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::03611 - Boulouchos, Konstantinos (emeritus) / Boulouchos, Konstantinos (emeritus)
ethz.date.deposited
2020-12-05T03:49:27Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-12-07T16:19:29Z
ethz.rosetta.lastUpdated
2022-03-29T05:27:10Z
ethz.rosetta.versionExported
true
ethz.COinS
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