Low Temperature Oxidation of Selected Jet Fuel and Diesel Fuel Components at Elevated Pressure

摘要

The low and intermediate temperature oxidation of n-decane, methylcyclohexane, n-butylcyclohexane, toluene, and n-butylbenzene was examined alone and in selected mixtures in a pressurized flow reactor (600 ＜ T ＜ 800 K, P = 0.8 MPa, fuel lean＝. Similar experiments were carried out for three samples of JP-8. The Negative Temperature Coefficient (NTC) behavior of the fuels was monitored using carbon monoxide concentration measurements. The JP-8 samples and neat n-decane and n-butylcyclohexane displayed standard NTC behavior, while neat methylcyclohexane, toluene, and n-butylbenzene were not reactive under the present test conditions. However, toluene and n-butylbenzene did appear to function as reactivity inhibitors, as they reduced overall reactivity in mixtures with n-decane, methylcyclohexane, and n-butylcyclohexane. In a complimentary study, the low and intermediate temperature reactivity of 2:1:1 and 1:1:1 n-decane:n-butylcyclohexane:n-butylbenzene, suggested as possible jet fuel and diesel surrogates, respectively, was compared to the reactivity of JP-8 in the pressurized flow reactor and in studies in a research engine. Both mixtures were much more reactive than the JP-8. Recommendations for formulating more successful surrogates are discussed.