Abstract
Most liquid fuels contain compounds with one or more unsaturated C═C bonds. Previous studies have observed that the fuel reactivity and ignition behavior are strongly influenced by the presence and number of double bonds in the fuel molecular structure. Here, we report a numerical investigation on the effect of fuel unsaturation on PAHs and soot emissions in partially premixed flames (PPFs) burning n-heptane and 1-heptene fuels. A detailed soot and fuel oxidation model is validated against gaseous species measurements in n-heptane PPF and soot measurements in ethylene diffusion flames. Simulations are performed to examine the effects of double bonds on PAHs and soot emissions at different strain rates and levels of premixing. For both fuels, the global flame structure is characterized by a rich premixed reaction zone (RPZ) on the fuel side and a nonpremixed reaction zone (NPZ) on the oxidizer side. PAHs and soot are mainly formed in the region between the RPZ and stagnation plane. The presence of double b...
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