A comparative reactivity study of 1-alkene fuels from ethylene to 1-heptene

A comparative reactivity study of 1-alkene fuels from ethylene to 1-heptene has been performed using ignition delay time (IDT) measurements both a high-pressure shock tube and rapid compression machine, at an equivalence ratio 1.0 in ‘air’, pressure 30 atm the temperature range 600–1300 K. At low temperatures (< 950 K), results show that 1-alkenes with longer carbon chains higher fuel reactivity, 1-pentene being first negative coefficient (NTC) behavior followed by 1-hexene 1-heptene. high (> experimental all except propene very similar IDTs approximately four times than for other 1-alkenes. To analyze results, chemistry mechanism developed consistent rate constants these alkenes. 650 K, flux analyses hydroxyl radicals add double bond, addition molecular oxygen producing hydroxy?alkylperoxy radicals, which can proceed via Waddington or alternate internal H-atom isomerizations chain branching those alkanes. We have found major propagation reaction pathways compete pathyways mainly produce rather hydroperoxyl explains less pronounced NTC larger compared their corresponding 1200 accumulation is important auto-ignition The production 1-butene propene, due facilitating radical formation more efficient pathways. This reason presents lower temperatures.