Compositional effects on the ignition of FACE gasolines

Handle URI:
http://hdl.handle.net/10754/621733
Title:
Compositional effects on the ignition of FACE gasolines
Authors:
Sarathy, Mani ( 0000-0002-3975-6206 ) ; Kukkadapu, Goutham; Mehl, Marco; Javed, Tamour ( 0000-0002-3328-9061 ) ; Ahmed, Ahfaz; Naser, Nimal ( 0000-0002-2740-2179 ) ; Tekawade, Aniket; Kosiba, Graham; Alabbad, Mohammed; Singh, Eshan ( 0000-0001-8851-4724 ) ; Park, Sungwoo ( 0000-0002-2800-1908 ) ; Rashidi, Mariam Al; Chung, Suk-Ho ( 0000-0001-8782-312X ) ; Roberts, William L. ( 0000-0003-1999-2831 ) ; Oehlschlaeger, Matthew A.; Sung, Chih-Jen; Farooq, Aamir ( 0000-0001-5296-2197 )
Abstract:
As regulatory measures for improved fuel economy and decreased emissions are pushing gasoline engine combustion technologies towards extreme conditions (i.e., boosted and intercooled intake with exhaust gas recirculation), fuel ignition characteristics become increasingly important for enabling stable operation. This study explores the effects of chemical composition on the fundamental ignition behavior of gasoline fuels. Two well-characterized, high-octane, non-oxygenated FACE (Fuels for Advanced Combustion Engines) gasolines, FACE F and FACE G, having similar antiknock indices but different octane sensitivities and chemical compositions are studied. Ignition experiments were conducted in shock tubes and a rapid compression machine (RCM) at nominal pressures of 20 and 40. atm, equivalence ratios of 0.5 and 1.0, and temperatures ranging from 650 to 1270. K. Results at temperatures above 900. K indicate that ignition delay time is similar for these fuels. However, RCM measurements below 900. K demonstrate a stronger negative temperature coefficient behavior for FACE F gasoline having lower octane sensitivity. In addition, RCM pressure profiles under two-stage ignition conditions illustrate that the magnitude of low-temperature heat release (LTHR) increases with decreasing fuel octane sensitivity. However, intermediate-temperature heat release is shown to increase as fuel octane sensitivity increases. Various surrogate fuel mixtures were formulated to conduct chemical kinetic modeling, and complex multicomponent surrogate mixtures were shown to reproduce experimentally observed trends better than simpler two- and three-component mixtures composed of n-heptane, iso-octane, and toluene. Measurements in a Cooperative Fuels Research (CFR) engine demonstrated that the multicomponent surrogates accurately captured the antiknock quality of the FACE gasolines. Simulations were performed using multicomponent surrogates for FACE F and G to reveal the underlying chemical kinetics linking fuel composition with ignition characteristics. A key discovery of this work is the kinetic coupling between aromatics and naphthenes, which affects the radical pool population and thereby controls ignition. © 2016 The Combustion Institute.
KAUST Department:
Clean Combustion Research Center
Citation:
Sarathy SM, Kukkadapu G, Mehl M, Javed T, Ahmed A, et al. (2016) Compositional effects on the ignition of FACE gasolines. Combustion and Flame 169: 171–193. Available: http://dx.doi.org/10.1016/j.combustflame.2016.04.010.
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
8-May-2016
DOI:
10.1016/j.combustflame.2016.04.010
Type:
Article
ISSN:
0010-2180
Sponsors:
The authors are grateful to Hendrik Muller (Saudi Aramco R&DC), Jihad Badra (Saudi Aramco R&DC), Abdulla Algam (Saudi Aramco R&DC), Emad Alawi (Saudi Aramco R&DC), and Nadim Hourani (KAUST) for the DHA results. The KAUST authors acknowledge funding support from the Clean Combustion Research Center and from Saudi Aramco under the FUELCOM program. The work at the University of Connecticut was supported by the National Science Foundation under Grant No. CBET-1402231. The Rensselaer group was supported by the U.S. Air Force Office of Scientific Research (Grant No. FA9550-11-1-0261) with Dr. Chiping Li as technical monitor. The LLNL work was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under Contract DE- AC52-07NA27344 and was supported by the U.S. Department of Energy, Office of Vehicle Technologies, Gurpreet Singh, program manager.
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorSarathy, Manien
dc.contributor.authorKukkadapu, Gouthamen
dc.contributor.authorMehl, Marcoen
dc.contributor.authorJaved, Tamouren
dc.contributor.authorAhmed, Ahfazen
dc.contributor.authorNaser, Nimalen
dc.contributor.authorTekawade, Aniketen
dc.contributor.authorKosiba, Grahamen
dc.contributor.authorAlabbad, Mohammeden
dc.contributor.authorSingh, Eshanen
dc.contributor.authorPark, Sungwooen
dc.contributor.authorRashidi, Mariam Alen
dc.contributor.authorChung, Suk-Hoen
dc.contributor.authorRoberts, William L.en
dc.contributor.authorOehlschlaeger, Matthew A.en
dc.contributor.authorSung, Chih-Jenen
dc.contributor.authorFarooq, Aamiren
dc.date.accessioned2016-11-03T13:23:48Z-
dc.date.available2016-11-03T13:23:48Z-
dc.date.issued2016-05-08en
dc.identifier.citationSarathy SM, Kukkadapu G, Mehl M, Javed T, Ahmed A, et al. (2016) Compositional effects on the ignition of FACE gasolines. Combustion and Flame 169: 171–193. Available: http://dx.doi.org/10.1016/j.combustflame.2016.04.010.en
dc.identifier.issn0010-2180en
dc.identifier.doi10.1016/j.combustflame.2016.04.010en
dc.identifier.urihttp://hdl.handle.net/10754/621733-
dc.description.abstractAs regulatory measures for improved fuel economy and decreased emissions are pushing gasoline engine combustion technologies towards extreme conditions (i.e., boosted and intercooled intake with exhaust gas recirculation), fuel ignition characteristics become increasingly important for enabling stable operation. This study explores the effects of chemical composition on the fundamental ignition behavior of gasoline fuels. Two well-characterized, high-octane, non-oxygenated FACE (Fuels for Advanced Combustion Engines) gasolines, FACE F and FACE G, having similar antiknock indices but different octane sensitivities and chemical compositions are studied. Ignition experiments were conducted in shock tubes and a rapid compression machine (RCM) at nominal pressures of 20 and 40. atm, equivalence ratios of 0.5 and 1.0, and temperatures ranging from 650 to 1270. K. Results at temperatures above 900. K indicate that ignition delay time is similar for these fuels. However, RCM measurements below 900. K demonstrate a stronger negative temperature coefficient behavior for FACE F gasoline having lower octane sensitivity. In addition, RCM pressure profiles under two-stage ignition conditions illustrate that the magnitude of low-temperature heat release (LTHR) increases with decreasing fuel octane sensitivity. However, intermediate-temperature heat release is shown to increase as fuel octane sensitivity increases. Various surrogate fuel mixtures were formulated to conduct chemical kinetic modeling, and complex multicomponent surrogate mixtures were shown to reproduce experimentally observed trends better than simpler two- and three-component mixtures composed of n-heptane, iso-octane, and toluene. Measurements in a Cooperative Fuels Research (CFR) engine demonstrated that the multicomponent surrogates accurately captured the antiknock quality of the FACE gasolines. Simulations were performed using multicomponent surrogates for FACE F and G to reveal the underlying chemical kinetics linking fuel composition with ignition characteristics. A key discovery of this work is the kinetic coupling between aromatics and naphthenes, which affects the radical pool population and thereby controls ignition. © 2016 The Combustion Institute.en
dc.description.sponsorshipThe authors are grateful to Hendrik Muller (Saudi Aramco R&DC), Jihad Badra (Saudi Aramco R&DC), Abdulla Algam (Saudi Aramco R&DC), Emad Alawi (Saudi Aramco R&DC), and Nadim Hourani (KAUST) for the DHA results. The KAUST authors acknowledge funding support from the Clean Combustion Research Center and from Saudi Aramco under the FUELCOM program. The work at the University of Connecticut was supported by the National Science Foundation under Grant No. CBET-1402231. The Rensselaer group was supported by the U.S. Air Force Office of Scientific Research (Grant No. FA9550-11-1-0261) with Dr. Chiping Li as technical monitor. The LLNL work was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under Contract DE- AC52-07NA27344 and was supported by the U.S. Department of Energy, Office of Vehicle Technologies, Gurpreet Singh, program manager.en
dc.publisherElsevier BVen
dc.subjectChemical kinetic modelingen
dc.subjectIgnitionen
dc.subjectOctane numberen
dc.subjectRapid compression machineen
dc.subjectShock tubeen
dc.subjectSurrogate fuelsen
dc.titleCompositional effects on the ignition of FACE gasolinesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionDepartment of Mechanical Engineering, University of Connecticut, Storrs, CT, United Statesen
dc.contributor.institutionLawrence Livermore National Laboratory, Livermore, CA, United Statesen
dc.contributor.institutionMechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, United Statesen
kaust.authorSarathy, Manien
kaust.authorJaved, Tamouren
kaust.authorAhmed, Ahfazen
kaust.authorNaser, Nimalen
kaust.authorAlabbad, Mohammeden
kaust.authorSingh, Eshanen
kaust.authorPark, Sungwooen
kaust.authorRashidi, Mariam Alen
kaust.authorChung, Suk-Hoen
kaust.authorRoberts, William L.en
kaust.authorFarooq, Aamiren
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