Oxidation and pyrolysis study on different gasoline surrogates in the jet-stirred reactor
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Maram Almaki - Final Master Thesis Paper
Type
ThesisAuthors
Almalki, Maram M.
Advisors
Sarathy, Mani
Committee members
Gascon, Jorge
Farooq, Aamir

Program
Chemical ScienceKAUST Department
Physical Science and Engineering (PSE) DivisionDate
2018-05Permanent link to this record
http://hdl.handle.net/10754/628067
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A better understanding and control of internal combustion engine pollutants require more insightful investigation of gasoline oxidation chemistry. An oxidation study has been done on n-heptane, iso-octane, their binary mixtures (Primary Reference Fuel, (PRF)), and nine hydrocarbon mixtures which represent the second generation of gasoline surrogates (multi-component surrogates). This study aims to develop a better understanding of the combustion reaction by studying the oxidation reaction of different fuels inside a jet-stirred reactor and numerically simulating the reaction using different models under the following conditions: pressure 1 bar, temperature 500-1050K, residence time 1.0 and 2.0s, and two fuel-to-oxygen ratios (ϕ=0.5 and 1.0). Intermediate and product species mole fractions versus temperature profiles were experimentally measured using a GC (gas chromatograph). The experiment was performed within the high and low-temperature regions, where the high-temperature oxidation showed similar behavior for different compositions but the low-temperature oxidation showed significant dependence on the composition of the surrogates. Additionally, the effect of octane number on oxidation chemistry has been investigated and it was found that the low octane number surrogates were more reactive than high octane number surrogates during the low temperature regime. Furthermore, Kinetic analysis was conducted to provide insightful understanding of different factors of fuel reactivity. In addition, the pyrolysis of two TPRF, (Toluene primary reference fuels) mixtures (TPRF70 and TPRF97.5), representing low octane (research octane number 70) and high octane (research octane number 97.5) gasoline, was also studied in jet-stirred reactor coupled with gas chromatography (GC) analysis to investigate the formation of soot and polycyclic aromatic hydrocarbons (PAH) formation.Citation
Almalki, M. M. (2018). Oxidation and pyrolysis study on different gasoline surrogates in the jet-stirred reactor. KAUST Research Repository. https://doi.org/10.25781/KAUST-OLOHGae974a485f413a2113503eed53cd6c53
10.25781/KAUST-OLOHG