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dc.contributor.authorAn, Yanzhao
dc.contributor.authorJaasim, Mohammed
dc.contributor.authorVallinayagam, R
dc.contributor.authorAlRamadan, Abdullah
dc.contributor.authorSim, Jaeheon
dc.contributor.authorChang, Junseok
dc.contributor.authorIm, Hong G.
dc.contributor.authorJohansson, Bengt
dc.date.accessioned2018-12-31T14:15:28Z
dc.date.available2018-12-31T14:15:28Z
dc.date.issued2018-09-10
dc.identifier.citationAn Y, Mubarak Ali MJ, Vallinayagam R, AlRamadan A, Sim J, et al. (2018) Compression Ignition of Low Octane Gasoline under Partially Premixed Combustion Mode. SAE Technical Paper Series. Available: http://dx.doi.org/10.4271/2018-01-1797.
dc.identifier.doi10.4271/2018-01-1797
dc.identifier.urihttp://hdl.handle.net/10754/630713
dc.description.abstractPartially premixed combustion (PPC) is an operating mode that lies between the conventional compression ignition (CI) mode and homogeneous charge compression ignition (HCCI) mode. The combustion in this mixed mode is complex as it is neither diffusion-controlled (CI mode) nor governed solely by chemical kinetics (HCCI mode). In this study, CFD simulations were performed to evaluate flame index, which distinguishes between zones having a premixed flame and non-premixed flame. Experiments performed in the optical engine supplied data to validate the model. In order to realize PPC, the start of injection (SOI) was fixed at -40 CAD (aTDC) so that a required ignition delay is created to premix air/fuel mixture. The reference operating point was selected to be with 3 bar IMEP and 1200 rpm. Naphtha with a RON of 77 and its corresponding PRF surrogate were tested. The simulations captured the general trends observed in the experiments well. The flame index was noted to be an indicator to evaluate and quantify the in-cylinder combustion development under PPC engine operating condition. The evolution of premixed flames shows the same two-stage ignition behavior as the rate of heat release. Premixed flames are surrounded by the non-premixed fuel/air mixtures and distribute in the piston top-land region as isolated clouds. The proportion of premixed flames increases from low temperature heat release (LTHR) region first and decreases in negative temperature coefficient (NTC) region then increases to high temperature heat release (HTHR) region at PPC mode.
dc.description.sponsorshipThis work was funded by competitive research funding from King Abdullah University of Science and Technology (KAUST) and Saudi Aramco under the FUELCOM2 program. The authors would also like to Adrian I. Ichim and Riyad Jambi in KAUST Engine Laboratory for providing the experimental data. The simulations utilized resources at the KAUST Supercomputing Laboratory (KSL).
dc.publisherSAE International
dc.relation.urlhttps://saemobilus.sae.org/content/2018-01-1797
dc.titleCompression Ignition of Low Octane Gasoline under Partially Premixed Combustion Mode
dc.typeConference Paper
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentComputational Reacting Flow Laboratory (CRFL)
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalSAE Technical Paper Series
dc.conference.date2018-09-17 to 2018-09-19
dc.conference.nameSAE 2018 International Powertrains, Fuels and Lubricants Meeting, FFL 2018
dc.conference.locationHeidelberg, DEU
dc.contributor.institutionSaudi Aramco, , Saudi Arabia
kaust.personAn, Yanzhao
kaust.personJaasim, Mohammed
kaust.personVallinayagam, R
kaust.personAlRamadan, Abdullah
kaust.personIm, Hong G.
kaust.personJohansson, Bengt


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