Large-eddy simulation of dual-fuel ignition

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Kahila, Heikki Wehrfritz, Armin Kaario, Ossi Vuorinen, Ville 2019-02-25T08:40:05Z 2019-02-25T08:40:05Z 2019-01-01
dc.identifier.citation Kahila , H , Wehrfritz , A , Kaario , O & Vuorinen , V 2019 , ' Large-eddy simulation of dual-fuel ignition : Diesel spray injection into a lean methane-air mixture ' Combustion and Flame , vol. 199 , pp. 131-151 . en
dc.identifier.issn 0010-2180
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dc.identifier.other PURE ITEMURL:
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dc.description.abstract In the present study, large-eddy simulation (LES) together with a finite-rate chemistry model is utilized for the investigation of a dual-fuel (DF) ignition process where a diesel surrogate (n-dodecane) spray ignites a lean methane-air mixture in engine relevant conditions. The spray setup corresponds to the Engine Combustion Network (ECN) Spray A configuration enabling an extensive validation of the present numerical models in terms of liquid and vapor penetration, mixture distribution, ignition delay time (IDT) and spatial formaldehyde concentration. The suitability of two n-dodecane mechanisms (54 and 96 species) to cover dual-fuel chemical kinetics is investigated by comparing the predicted homogeneous IDTs and laminar flame speeds to reference values in single-fuel methane-air mixtures. LES of an n-dodecane spray in DF conditions is carried out and compared against the baseline ECN Spray A results. The main results of the study are: (1) ambient methane impacts the ignition chemistry throughout the oxidation process. In particular, the activation of the low-temperature chemistry is delayed by a factor of 2.6 with both mechanisms, whereas the high-temperature chemistry is delayed by a factor of 1.6–2.4, depending on the mechanism. (2) The ignition process starts from the spray tip. (3) There exists a characteristic induction time in the order of 0.1 ms between the start of the first high-temperature reactions and the time when maximum methane consumption rate is achieved. (4) The high-temperature ignition process begins near the most reactive mixture fraction conditions. (5) The role of low-temperature reactions is of particular importance for initiation of the production of intermediate species and heat, required in methane oxidation and (6) both applied mechanisms yield qualitatively the same features (1)–(5) in the DF configuration. en
dc.format.extent 21
dc.format.extent 131-151
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Combustion and Flame en
dc.relation.ispartofseries Volume 199 en
dc.rights openAccess en
dc.subject.other Chemistry(all) en
dc.subject.other Chemical Engineering(all) en
dc.subject.other Fuel Technology en
dc.subject.other Energy Engineering and Power Technology en
dc.subject.other Physics and Astronomy(all) en
dc.subject.other 213 Electronic, automation and communications engineering, electronics en
dc.title Large-eddy simulation of dual-fuel ignition en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Mechanical Engineering
dc.contributor.department University of New South Wales
dc.contributor.department Department of Mechanical Engineering en
dc.subject.keyword Dual-fuel
dc.subject.keyword ECN
dc.subject.keyword Ignition kernel
dc.subject.keyword LES
dc.subject.keyword pyJac
dc.subject.keyword Spray A
dc.subject.keyword Chemistry(all)
dc.subject.keyword Chemical Engineering(all)
dc.subject.keyword Fuel Technology
dc.subject.keyword Energy Engineering and Power Technology
dc.subject.keyword Physics and Astronomy(all)
dc.subject.keyword 213 Electronic, automation and communications engineering, electronics
dc.identifier.urn URN:NBN:fi:aalto-201902251790
dc.identifier.doi 10.1016/j.combustflame.2018.10.014
dc.type.version publishedVersion

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