实验和模型分析NO2对乙烷自点火敏化作用的动力学机制

For the kinetic mechanism development of NOx formation and the effective utilization of NOx in designing engine combustors with high combustion efficiency,ignition delay time was measured for stoichiometric NO2/C2H6/O2/Ar mixtures(blending ratios of NO2/C2H6 is 0.3 and 1.0 with 95%, Ar diluent)by using shock tube.Reflected shock condition covered the temperatures from 950-1,600,K and the pressures from 0.12-2.00,MPa.The results reveal that NO2 shows only limited effect on C2H6 reactivity at low pres-sures(p=0.12,MPa)over the entire temperature range.At high pressures(p, 0.50,MPa),however,the NO2 pre-sents a similar effect to that in the low pressure case at high temperatures(T 1,250,K),whereas it makes a significant impact on the ignition delay time of C2H6 at lower temperatures(T 1,250,K)and the promotion becomes more obvious with decreasing temperature.A detail kinetic mechanism of NO2/C2H6 was proposed and validated against the new data reported in this study.Flux analysis was also performed to explore the chemical interaction between NO2 and C2H6.