Hydrocarbon species concentrations are measured in a laminar jet diffusion flame at elevated pressures with the objective to better understand soot production and oxidation mechanisms which will ultimately help reduce soot emissions from practical combustion hardware. Samples were extracted from the centerline of an ethylene flame diluted with nitrogen. The fuel to air velocity ratio was unity for all cases (i.e., air co-flow had the same exit velocity as the reactant mixture, fuel plus diluent) to avoid any shear effects on the flame surface, and the reactant mass flux was held constant for all pressures. Peak acetylene concentrations decrease with increase in pressure and pressure is observed to be a primary soot precursor in an ethylene flame. The effect of pressure has a positive effect in increasing the non fuel hydrocarbon concentrations at elevated pressure.
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