A methodology to relate octane numbers of binary and ternary n-heptane, iso-octane and toluene mixtures with simulated ignition delay times

Handle URI:
http://hdl.handle.net/10754/567098
Title:
A methodology to relate octane numbers of binary and ternary n-heptane, iso-octane and toluene mixtures with simulated ignition delay times
Authors:
Badra, Jihad A.; Bokhumseen, Nehal; Mulla, Najood; Sarathy, Mani ( 0000-0002-3975-6206 ) ; Farooq, Aamir ( 0000-0001-5296-2197 ) ; Kalghatgi, Gautam; Gaillard, Patrick
Abstract:
Predicting octane numbers (ON) of gasoline surrogate mixtures is of significant importance to the optimization and development of internal combustion (IC) engines. Most ON predictive tools utilize blending rules wherein measured octane numbers are fitted using linear or non-linear mixture fractions on a volumetric or molar basis. In this work, the octane numbers of various binary and ternary n-heptane/iso-octane/toluene blends, referred to as toluene primary reference fuel (TPRF) mixtures, are correlated with a fundamental chemical kinetic parameter, specifically, homogeneous gas-phase fuel/air ignition delay time. Ignition delay times for stoichiometric fuel/air mixtures are calculated at various constant volume conditions (835 K and 20 atm, 825 K and 25 atm, 850 K and 50 atm (research octane number RON-like) and 980 K and 45 atm (motor octane number MON-like)), and for variable volume profiles calculated from cooperative fuel research (CFR) engine pressure and temperature simulations. Compression ratio (or ON) dependent variable volume profile ignition delay times are investigated as well. The constant volume RON-like ignition delay times correlation with RON was the best amongst the other studied conditions. The variable volume ignition delay times condition correlates better with MON than the ignition delay times at the other tested conditions. The best correlation is achieved when using compression ratio dependent variable volume profiles to calculate the ignition delay times. Most of the predicted research octane numbers (RON) have uncertainties that are lower than the repeatability and reproducibility limits of the measurements. Motor octane number (MON) correlation generally has larger uncertainties than that of RON.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division
Citation:
A methodology to relate octane numbers of binary and ternary n-heptane, iso-octane and toluene mixtures with simulated ignition delay times 2015, 160:458 Fuel
Publisher:
Elsevier BV
Journal:
Fuel
Issue Date:
11-Aug-2015
DOI:
10.1016/j.fuel.2015.08.007
Type:
Article
ISSN:
00162361
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0016236115008078
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorBadra, Jihad A.en
dc.contributor.authorBokhumseen, Nehalen
dc.contributor.authorMulla, Najooden
dc.contributor.authorSarathy, Manien
dc.contributor.authorFarooq, Aamiren
dc.contributor.authorKalghatgi, Gautamen
dc.contributor.authorGaillard, Patricken
dc.date.accessioned2015-08-17T07:47:24Zen
dc.date.available2015-08-17T07:47:24Zen
dc.date.issued2015-08-11en
dc.identifier.citationA methodology to relate octane numbers of binary and ternary n-heptane, iso-octane and toluene mixtures with simulated ignition delay times 2015, 160:458 Fuelen
dc.identifier.issn00162361en
dc.identifier.doi10.1016/j.fuel.2015.08.007en
dc.identifier.urihttp://hdl.handle.net/10754/567098en
dc.description.abstractPredicting octane numbers (ON) of gasoline surrogate mixtures is of significant importance to the optimization and development of internal combustion (IC) engines. Most ON predictive tools utilize blending rules wherein measured octane numbers are fitted using linear or non-linear mixture fractions on a volumetric or molar basis. In this work, the octane numbers of various binary and ternary n-heptane/iso-octane/toluene blends, referred to as toluene primary reference fuel (TPRF) mixtures, are correlated with a fundamental chemical kinetic parameter, specifically, homogeneous gas-phase fuel/air ignition delay time. Ignition delay times for stoichiometric fuel/air mixtures are calculated at various constant volume conditions (835 K and 20 atm, 825 K and 25 atm, 850 K and 50 atm (research octane number RON-like) and 980 K and 45 atm (motor octane number MON-like)), and for variable volume profiles calculated from cooperative fuel research (CFR) engine pressure and temperature simulations. Compression ratio (or ON) dependent variable volume profile ignition delay times are investigated as well. The constant volume RON-like ignition delay times correlation with RON was the best amongst the other studied conditions. The variable volume ignition delay times condition correlates better with MON than the ignition delay times at the other tested conditions. The best correlation is achieved when using compression ratio dependent variable volume profiles to calculate the ignition delay times. Most of the predicted research octane numbers (RON) have uncertainties that are lower than the repeatability and reproducibility limits of the measurements. Motor octane number (MON) correlation generally has larger uncertainties than that of RON.en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0016236115008078en
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, 11 August 2015. DOI: 10.1016/j.fuel.2015.08.007en
dc.subjectOctane numbersen
dc.subjectIgnition delay timesen
dc.subjectToluene primary reference fuelsen
dc.subjectChemical kineticsen
dc.titleA methodology to relate octane numbers of binary and ternary n-heptane, iso-octane and toluene mixtures with simulated ignition delay timesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalFuelen
dc.eprint.versionPost-printen
dc.contributor.institutionSaudi Aramco Research and Development Center, Fuel Technology R&D Division, Dhahran 31311, Saudi Arabiaen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorSarathy, Manien
kaust.authorFarooq, Aamiren
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.