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This paper presents a new tri-component diesel surrogate fuel chemical kinetic mechanism. The cross reaction mechanism between N-heptane and toluene is added to the third component detailed mechanism of cyclohexane. Based on the composition of the diesel fuel, N-heptane, toluene, and cyclohexane are selected as ideal components for this new diesel surrogate fuel. The best ratio of the selected diesel surrogate fuel components, which representing heptanes, toluene, and cyclohexane with a ratio of 8:1:1 is determined for the three suggested components. Numerically, the result obtained from a Zero-dimensional thermodynamic code for the proposed tri-component mechanism have been intensively validated against a single, and two components detailed chemical kinetic mechanism. Furthermore, the obtained results validated against the referenced experimental engine data. The obtained results of the tri-component mechanism provide a remarkable agreement between the obtained experimental data in terms of ignition delay angles. The obtained results of ignition delay angles show that the suggested chemical kinetics mechanism can capture the auto-ignition angle and the whole combustion process. Nomenclature/Abbreviations SOC Start of Combustion MSN Means Square Error N Number of Engine Simulation Run EGR Exhaust Gas Recirculation IMEP Indicated Mean Effective Pressure CN Cetan Number C/H Carbon to Hydrogen Ratio M: 46 Medhat Elkelawy and Hagar Alm-Eldin Bastawissi LTO low Temperature Oxidation HTO High Temperature Oxidation NTC Negative Temperature Coefficient HCCI Homogeneous Charge Compression Ignition HRR Heat Release Rate` RPM Revolutions Per Minute TDC Top Dead Center ATDC After Top Dead Center BTDC Before Top Dead Center CI Compression Ignition ICE Internal Combustion Engine CA Crank Angle DI Direct Injection

A Detailed Chemical Kinetic Investigation of a Tri-Component Diesel Surrogate Ignition and Combustion under HCCI Engine Conditions