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LES/CMC modelling of ignition and flame propagation in a non-premixed methane jet

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cam.issuedOnline2018-11-02
dc.contributor.authorZhang, H
dc.contributor.authorGiusti, A
dc.contributor.authorMastorakos, E
dc.contributor.orcidZhang, H [0000-0002-5215-5712]
dc.date.accessioned2018-12-04T00:30:45Z
dc.date.available2018-12-04T00:30:45Z
dc.date.issued2019
dc.description.abstractThe Large Eddy Simulation (LES) / Conditional Moment Closure (CMC) model with detailed chemistry is used for modelling spark ignition and flame propagation in a turbulent methane jet in ambient air. Two centerline and one off-axis ignition locations are simulated. We focus on predicting the flame kernel formation, flame edge propagation and stabilization. The current LES/CMC computations capture the three stages reasonably well compared to available experimental data. Regarding the formation of flame kernel, it is found that the convection dominates the propagation of its downstream edge. The simulated initial downstream and radial flame propagation compare well with OH-PLIF images from the experiment. Additionally, when the spark is deposited at off-centerline locations, the flame first propagates downstream and then back upstream from the other side of the stoichiometric iso-surface. At the leading edge location, the chemical source term is larger than others in magnitude, indicating its role in the flame propagation. The time evolution of flame edge position and the final lift-off height are compared with measurements and generally good agreement is observed. The conditional quantities at the stabilization point reflect a balance between chemistry and micro-mixing. This investigation, which focused on model validation for various stages of spark ignition of a turbulent lifted jet flame through comparison with measurements, demonstrates that turbulent edge flame propagation in non-premixed systems can be captured reasonably well with LES/CMC.
dc.identifier.doi10.17863/CAM.33563
dc.identifier.eissn1873-2704
dc.identifier.issn1540-7489
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/286251
dc.language.isoeng
dc.publisherElsevier BV
dc.publisher.urlhttp://dx.doi.org/10.1016/j.proci.2018.09.031
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectFlame kernel formation
dc.subjectFlame edge propagation
dc.subjectFlame stabilization
dc.subjectLarge Eddy Simulation
dc.subjectConditional Moment Closure
dc.titleLES/CMC modelling of ignition and flame propagation in a non-premixed methane jet
dc.typeArticle
dcterms.dateAccepted2018-09-18
prism.endingPage2132
prism.issueIdentifier2
prism.publicationDate2019
prism.publicationNameProceedings of the Combustion Institute
prism.startingPage2125
prism.volume37
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/K025791/1)
rioxxterms.licenseref.startdate2019-01-01
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionAM
rioxxterms.versionofrecord10.1016/j.proci.2018.09.031

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