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dc.contributor.author
Sakellarakis, Vasileios D.
dc.contributor.author
Wright, Yuri M.
dc.contributor.author
Vera-Tudela, Walter
dc.contributor.author
Boulouchos, Konstantinos
dc.date.accessioned
2021-03-11T10:33:43Z
dc.date.available
2021-02-15T05:51:04Z
dc.date.available
2021-02-16T07:43:05Z
dc.date.available
2021-03-11T10:33:43Z
dc.date.issued
2021-05-01
dc.identifier.issn
0016-2361
dc.identifier.other
10.1016/j.fuel.2021.120169
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/469372
dc.identifier.doi
10.3929/ethz-b-000469372
dc.description.abstract
This work constitutes a numerical investigation of the autoignition of underexpanded methane jets at high-pressure conditions. Injection pressures from 125 to 500 bar, back pressures from 40 to 125 bar, and pressure ratios between 2.5 and 10 have been targeted. The aim is to identify the effect of the main control variables of gas injection on the autoignition delay and location. To this end, Reynolds-Averaged Navier-Stokes simulations with the model have been carried out for five broad parametric variations. The computational domain represents a Constant Volume Cell with a prototype gas injector. A two-stage workflow enables proper thermodynamic treatment of the conservation equations with real-gas modeling, sufficient resolution for shock structures in the near nozzle area, detailed kinetics described by the San Diego mechanism and treatment of turbulence-chemistry interaction with elliptic Conditional Moment Closure model. The results are interpreted conceptually as an interplay of jet reactivity, effectively described by an exponential dependence on ambient temperature and a power law dependence on ambient pressure, and of jet aerodynamics, empirically described by a quadratic dependence on pressure ratio. Injection temperature is introduced by defining an appropriate characteristic system temperature and a correlation is constructed, whose predictions are juxtaposed against a modified Arrhenius model and measurements from independent experimental studies in literature. The effect of injection variations on ignition location in physical space is also examined.
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
Underexpanded jet
en_US
dc.subject
High pressure direct injection
en_US
dc.subject
Conditional moment closure
en_US
dc.subject
RANS
en_US
dc.subject
Methane
en_US
dc.subject
Real-gas
en_US
dc.title
Numerical investigation of the autoignition of underexpanded methane jets
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
dc.date.published
2021-02-08
ethz.journal.title
Fuel
ethz.journal.volume
291
en_US
ethz.pages.start
120169
en_US
ethz.size
13 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.scopus
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2021-02-15T05:51:14Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-02-16T07:43:18Z
ethz.rosetta.lastUpdated
2022-03-29T05:43:09Z
ethz.rosetta.versionExported
true
ethz.COinS
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