Autoignition characteristics of oxygenated gasolines

Handle URI:
http://hdl.handle.net/10754/625735
Title:
Autoignition characteristics of oxygenated gasolines
Authors:
Lee, Changyoul; Ahmed, Ahfaz ( 0000-0001-5982-3464 ) ; Nasir, Ehson Fawad ( 0000-0003-1822-737X ) ; Badra, Jihad; Kalghatgi, Gautam; Sarathy, Mani ( 0000-0002-3975-6206 ) ; Curran, Henry; Farooq, Aamir ( 0000-0001-5296-2197 )
Abstract:
Gasoline anti-knock quality, defined by the research and motor octane numbers (RON and MON), is important for increasing spark ignition (SI) engine efficiency. Gasoline knock resistance can be increased using a number of blending components. For over two decades, ethanol has become a popular anti-knock blending agent with gasoline fuels due to its production from bio-derived resources. This work explores the oxidation behavior of two oxygenated certification gasoline fuels and the variation of fuel reactivity with molecular composition. Ignition delay times of Haltermann (RON = 91) and Coryton (RON = 97.5) gasolines have been measured in a high-pressure shock tube and in a rapid compression machine at three pressures of 10, 20 and 40 bar, at equivalence ratios of φ = 0.45, 0.9 and 1.8, and in the temperature range of 650–1250 K. The results indicate that the effects of fuel octane number and fuel composition on ignition characteristics are strongest in the intermediate temperature (negative temperature coefficient) region. To simulate the reactivity of these gasolines, three kinds of surrogates, consisting of three, four and eight components, are proposed and compared with the gasoline ignition delay times. It is shown that more complex surrogate mixtures are needed to emulate the reactivity of gasoline with higher octane sensitivity (S = RON–MON). Detailed kinetic analyses are performed to illustrate the dependence of gasoline ignition delay times on fuel composition and, in particular, on ethanol content.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division
Citation:
Lee C, Ahmed A, Nasir EF, Badra J, Kalghatgi G, et al. (2017) Autoignition characteristics of oxygenated gasolines. Combustion and Flame 186: 114–128. Available: http://dx.doi.org/10.1016/j.combustflame.2017.07.034.
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
14-Aug-2017
DOI:
10.1016/j.combustflame.2017.07.034
Type:
Article
ISSN:
0010-2180
Sponsors:
Research reported in this paper was funded by Saudi Aramco under the FUELCOM program and by King Abdullah University of Science and Technology (KAUST).
Additional Links:
http://www.sciencedirect.com/science/article/pii/S0010218017302900
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorLee, Changyoulen
dc.contributor.authorAhmed, Ahfazen
dc.contributor.authorNasir, Ehson Fawaden
dc.contributor.authorBadra, Jihaden
dc.contributor.authorKalghatgi, Gautamen
dc.contributor.authorSarathy, Manien
dc.contributor.authorCurran, Henryen
dc.contributor.authorFarooq, Aamiren
dc.date.accessioned2017-10-03T12:49:36Z-
dc.date.available2017-10-03T12:49:36Z-
dc.date.issued2017-08-14en
dc.identifier.citationLee C, Ahmed A, Nasir EF, Badra J, Kalghatgi G, et al. (2017) Autoignition characteristics of oxygenated gasolines. Combustion and Flame 186: 114–128. Available: http://dx.doi.org/10.1016/j.combustflame.2017.07.034.en
dc.identifier.issn0010-2180en
dc.identifier.doi10.1016/j.combustflame.2017.07.034en
dc.identifier.urihttp://hdl.handle.net/10754/625735-
dc.description.abstractGasoline anti-knock quality, defined by the research and motor octane numbers (RON and MON), is important for increasing spark ignition (SI) engine efficiency. Gasoline knock resistance can be increased using a number of blending components. For over two decades, ethanol has become a popular anti-knock blending agent with gasoline fuels due to its production from bio-derived resources. This work explores the oxidation behavior of two oxygenated certification gasoline fuels and the variation of fuel reactivity with molecular composition. Ignition delay times of Haltermann (RON = 91) and Coryton (RON = 97.5) gasolines have been measured in a high-pressure shock tube and in a rapid compression machine at three pressures of 10, 20 and 40 bar, at equivalence ratios of φ = 0.45, 0.9 and 1.8, and in the temperature range of 650–1250 K. The results indicate that the effects of fuel octane number and fuel composition on ignition characteristics are strongest in the intermediate temperature (negative temperature coefficient) region. To simulate the reactivity of these gasolines, three kinds of surrogates, consisting of three, four and eight components, are proposed and compared with the gasoline ignition delay times. It is shown that more complex surrogate mixtures are needed to emulate the reactivity of gasoline with higher octane sensitivity (S = RON–MON). Detailed kinetic analyses are performed to illustrate the dependence of gasoline ignition delay times on fuel composition and, in particular, on ethanol content.en
dc.description.sponsorshipResearch reported in this paper was funded by Saudi Aramco under the FUELCOM program and by King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0010218017302900en
dc.subjectOxygenated gasolineen
dc.subjectIgnition delay timesen
dc.subjectEthanolen
dc.subjectShock tubeen
dc.subjectRapid compression machineen
dc.titleAutoignition characteristics of oxygenated gasolinesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionCombustion Chemistry Center, National University of Ireland Galway, Galway, Irelanden
dc.contributor.institutionFuel Technology Center, Research and Development Center, Saudi Aramco, Dhahran, Saudi Arabiaen
kaust.authorAhmed, Ahfazen
kaust.authorNasir, Ehson Fawaden
kaust.authorSarathy, Manien
kaust.authorFarooq, Aamiren
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