Numerical investigation of injector geometry effects on fuel stratification in a GCI engine

Handle URI:
http://hdl.handle.net/10754/626214
Title:
Numerical investigation of injector geometry effects on fuel stratification in a GCI engine
Authors:
Atef, Nour; Badra, Jihad; Jaasim, Mohammed; Im, Hong G. ( 0000-0001-7080-1266 ) ; Sarathy, Mani ( 0000-0002-3975-6206 )
Abstract:
Injectors play an important role in direct injection (DI) gasoline compression ignition (GCI) engines by affecting the in-cylinder mixture formation and stratification, which in turn impacts combustion and emissions. In this work, the effects of two different injector geometries, a 7-hole solid-cone injector and an outwardly opening hollow-cone injector, on fuel mixture stratification in a GCI engine were investigated by computational simulations. Three fuels with similar autoignition kinetics, but with different physical properties, were studied to isolate the effect of the combustion chemistry on combustion phasing. In addition, start of injection (SOI) sweeps relevant to low-load engine operating conditions were performed. The results show that physical properties of the fuel do not have significant influence when using a hollow-cone injector. Richer mixtures were observed at all the studied SOI (−40 to −14 CAD aTDC) cases, which can be attributed to the nature of the hollow cone spray. At later SOIs (−18 and −14 CAD aTDC), the richer mixtures are accompanied by lower mean in-cylinder temperature due to the charge cooling effect, which surpasses the equivalence ratio effect. The effect of fuel physical properties on combustion phasing was evident in multi-hole injection cases, which can be attributed to the differences in mixture stratification and equivalence ratio distribution at the time of ignition.
KAUST Department:
Clean Combustion Research Center
Citation:
Atef N, Badra J, Jaasim M, Im HG, Sarathy SM (2018) Numerical investigation of injector geometry effects on fuel stratification in a GCI engine. Fuel 214: 580–589. Available: http://dx.doi.org/10.1016/j.fuel.2017.11.036.
Publisher:
Elsevier BV
Journal:
Fuel
Issue Date:
24-Nov-2017
DOI:
10.1016/j.fuel.2017.11.036
Type:
Article
ISSN:
0016-2361
Sponsors:
The authors are grateful of insightful scientific discussions with Dr.Jaeheon Sim (Saudi Aramco). The presented work was supported by Saudi Aramco under the FUELCOM program and by the King Abdullah University of Science and Technology (KAUST) with competitive research funding given to the Clean Combustion Research Center (CCRC).
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0016236117314394
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorAtef, Nouren
dc.contributor.authorBadra, Jihaden
dc.contributor.authorJaasim, Mohammeden
dc.contributor.authorIm, Hong G.en
dc.contributor.authorSarathy, Manien
dc.date.accessioned2017-11-28T05:59:51Z-
dc.date.available2017-11-28T05:59:51Z-
dc.date.issued2017-11-24en
dc.identifier.citationAtef N, Badra J, Jaasim M, Im HG, Sarathy SM (2018) Numerical investigation of injector geometry effects on fuel stratification in a GCI engine. Fuel 214: 580–589. Available: http://dx.doi.org/10.1016/j.fuel.2017.11.036.en
dc.identifier.issn0016-2361en
dc.identifier.doi10.1016/j.fuel.2017.11.036en
dc.identifier.urihttp://hdl.handle.net/10754/626214-
dc.description.abstractInjectors play an important role in direct injection (DI) gasoline compression ignition (GCI) engines by affecting the in-cylinder mixture formation and stratification, which in turn impacts combustion and emissions. In this work, the effects of two different injector geometries, a 7-hole solid-cone injector and an outwardly opening hollow-cone injector, on fuel mixture stratification in a GCI engine were investigated by computational simulations. Three fuels with similar autoignition kinetics, but with different physical properties, were studied to isolate the effect of the combustion chemistry on combustion phasing. In addition, start of injection (SOI) sweeps relevant to low-load engine operating conditions were performed. The results show that physical properties of the fuel do not have significant influence when using a hollow-cone injector. Richer mixtures were observed at all the studied SOI (−40 to −14 CAD aTDC) cases, which can be attributed to the nature of the hollow cone spray. At later SOIs (−18 and −14 CAD aTDC), the richer mixtures are accompanied by lower mean in-cylinder temperature due to the charge cooling effect, which surpasses the equivalence ratio effect. The effect of fuel physical properties on combustion phasing was evident in multi-hole injection cases, which can be attributed to the differences in mixture stratification and equivalence ratio distribution at the time of ignition.en
dc.description.sponsorshipThe authors are grateful of insightful scientific discussions with Dr.Jaeheon Sim (Saudi Aramco). The presented work was supported by Saudi Aramco under the FUELCOM program and by the King Abdullah University of Science and Technology (KAUST) with competitive research funding given to the Clean Combustion Research Center (CCRC).en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0016236117314394en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Fuel. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Fuel, [, , (2017-11-24)] DOI: 10.1016/j.fuel.2017.11.036 . © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectLight naphthaen
dc.subjectMulti-hole sprayen
dc.subjectHollow-cone sprayen
dc.subjectStratificationen
dc.titleNumerical investigation of injector geometry effects on fuel stratification in a GCI engineen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalFuelen
dc.eprint.versionPost-printen
dc.contributor.institutionFuel Technology Division, R&DC, Saudi Aramco, Dhahran, Saudi Arabiaen
kaust.authorAtef, Nouren
kaust.authorJaasim, Mohammeden
kaust.authorIm, Hong G.en
kaust.authorSarathy, Manien
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