In-cylinder Combustion and Soot Evolution in the Transition from Conventional CI mode to PPC

Handle URI:
http://hdl.handle.net/10754/626757
Title:
In-cylinder Combustion and Soot Evolution in the Transition from Conventional CI mode to PPC
Authors:
An, Yanzhao; Jaasim, Mohammed; Raman, Vallinayagam ( 0000-0003-4478-8525 ) ; Im, Hong G. ( 0000-0001-7080-1266 ) ; Johansson, Bengt ( 0000-0002-0163-5062 )
Abstract:
The present study intends to explore the in-cylinder combustion and evolution of soot emission during the transition from conventional compression ignition (CI) combustion to partially premixed combustion (PPC) at low load conditions. In-cylinder combustion images and engine-out emissions were measured in an optical engine fueled with low octane heavy naphtha fuel (RON = 50). Full cycle engine simulations were performed using a three-dimensional computational fluid dynamics code CONVERGETM, coupled with gas phase chemical kinetics, turbulence, and particulate size mimic soot model. The simulations were performed under low load conditions (IMEP ~ 2 to 3 bar) at an engine speed of 1200 rpm. The start of injection (SOI) was advanced from late (-10 CAD aTDC) to early fuel injection timings (-40 CAD aTDC) to realize the combustion transition from CI combustion to PPC. The simulation results of combustion and emission are compared with the experimental results at both CI and PPC combustion modes. The results of the study show a typical low-temperature stratified lean combustion at PPC mode, while high-temperature spray-driven combustion is evident at CI mode. The in-cylinder small intermediates species such as acetylene (C2H2), propargyl (C3H3), cyclopentadienyl (C5H5) and polycyclic aromatic hydrocarbons (PAHs) were significantly suppressed at PPC mode. Nucleation reaction of PAHs collision contributed to main soot mass production. The distribution of soot mass and particle number density was consistent with the distribution of high-temperature zones at CI and PPC combustion modes.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program
Citation:
An Y, Mubarak Ali MJ, Raman V, Im HG, Johansson B (2018) In-cylinder Combustion and Soot Evolution in the Transition from Conventional CI mode to PPC. Energy & Fuels. Available: http://dx.doi.org/10.1021/acs.energyfuels.7b02535.
Publisher:
American Chemical Society (ACS)
Journal:
Energy & Fuels
Issue Date:
9-Jan-2018
DOI:
10.1021/acs.energyfuels.7b02535
Type:
Article
ISSN:
0887-0624; 1520-5029
Sponsors:
This work was funded by competitive research funding from King Abdullah University of Science and Technology (KAUST), and by Saudi Aramco under the FUELCOM-II program. The authors would like to thank Adrian. I. Ichim and Riyad Jambi for their technical support in conducting the engine experiments, and Convergent Science for providing licenses for the CONVERGE software.
Additional Links:
http://pubs.acs.org/doi/10.1021/acs.energyfuels.7b02535
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorAn, Yanzhaoen
dc.contributor.authorJaasim, Mohammeden
dc.contributor.authorRaman, Vallinayagamen
dc.contributor.authorIm, Hong G.en
dc.contributor.authorJohansson, Bengten
dc.date.accessioned2018-01-15T06:10:40Z-
dc.date.available2018-01-15T06:10:40Z-
dc.date.issued2018-01-09en
dc.identifier.citationAn Y, Mubarak Ali MJ, Raman V, Im HG, Johansson B (2018) In-cylinder Combustion and Soot Evolution in the Transition from Conventional CI mode to PPC. Energy & Fuels. Available: http://dx.doi.org/10.1021/acs.energyfuels.7b02535.en
dc.identifier.issn0887-0624en
dc.identifier.issn1520-5029en
dc.identifier.doi10.1021/acs.energyfuels.7b02535en
dc.identifier.urihttp://hdl.handle.net/10754/626757-
dc.description.abstractThe present study intends to explore the in-cylinder combustion and evolution of soot emission during the transition from conventional compression ignition (CI) combustion to partially premixed combustion (PPC) at low load conditions. In-cylinder combustion images and engine-out emissions were measured in an optical engine fueled with low octane heavy naphtha fuel (RON = 50). Full cycle engine simulations were performed using a three-dimensional computational fluid dynamics code CONVERGETM, coupled with gas phase chemical kinetics, turbulence, and particulate size mimic soot model. The simulations were performed under low load conditions (IMEP ~ 2 to 3 bar) at an engine speed of 1200 rpm. The start of injection (SOI) was advanced from late (-10 CAD aTDC) to early fuel injection timings (-40 CAD aTDC) to realize the combustion transition from CI combustion to PPC. The simulation results of combustion and emission are compared with the experimental results at both CI and PPC combustion modes. The results of the study show a typical low-temperature stratified lean combustion at PPC mode, while high-temperature spray-driven combustion is evident at CI mode. The in-cylinder small intermediates species such as acetylene (C2H2), propargyl (C3H3), cyclopentadienyl (C5H5) and polycyclic aromatic hydrocarbons (PAHs) were significantly suppressed at PPC mode. Nucleation reaction of PAHs collision contributed to main soot mass production. The distribution of soot mass and particle number density was consistent with the distribution of high-temperature zones at CI and PPC combustion modes.en
dc.description.sponsorshipThis work was funded by competitive research funding from King Abdullah University of Science and Technology (KAUST), and by Saudi Aramco under the FUELCOM-II program. The authors would like to thank Adrian. I. Ichim and Riyad Jambi for their technical support in conducting the engine experiments, and Convergent Science for providing licenses for the CONVERGE software.en
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/10.1021/acs.energyfuels.7b02535en
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Energy & Fuels, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/10.1021/acs.energyfuels.7b02535.en
dc.subjectLow Octane Gasolineen
dc.subjectPartially Premixed Combustionen
dc.subjectSoot Particlesen
dc.titleIn-cylinder Combustion and Soot Evolution in the Transition from Conventional CI mode to PPCen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.identifier.journalEnergy & Fuelsen
dc.eprint.versionPost-printen
kaust.authorAn, Yanzhaoen
kaust.authorJaasim, Mohammeden
kaust.authorRaman, Vallinayagamen
kaust.authorIm, Hong G.en
kaust.authorJohansson, Bengten
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