C_2H_6/H_2混合气着火特性的实验与化学动力学研究

Experimental and Kinetic Research on Ignition Characteristics of C_2H_6/H_2 Mixtures

利用高压激波管实验装置测量了化学计量比下的C2H6/H2/O2/Ar混合气的着火延迟期,实验的温度范围为900～1 700 K,压力为1.2～16倍标准大气压.实验结果表明：当混合气中C2H6的摩尔分数xc2H6＞30％时,着火延迟期与温度和压力呈现出了典型的Arrhenius依赖性;当3％≤xC2H6＜30％时,着火延迟期与温度仍呈现出Arrhenius关系,但是压力越高全局活化能越高;当xC2H6≤3％时,着火延迟期与温度和压力呈现出复杂的依赖关系.模拟结果表明：xc2H6对C2H6/H2混合气着火延迟期的影响是非线性的,NUIG Aramco Mech 1.3机理可以很好地预测出实验结果;通过化学反应路径分析和标准化的H自由基分析,可以解释着火延迟期对xC2H6的依赖关系.

Ignition delay times of stoichiometric C2H6/H2/O2/Ar mixtures were measured by high-pressure shock tube faculty.The temperature is set from 900 to 1 700 K,the pressure from 1.2 to 16.0 atm.,and the ethane blending ratio from 0% to 100%.The experiments show that for xc2H6 〉30%,ignition delay time shows a typical Arrhenius dependence on temperature and pressure.For 3 %≤xc2H6 〈30 %,the ignition delay time presents a typical Arrhenius dependence on temperature and the higher pressure the higher ignition activation energy.For xc2H6 ≤3 %,the ignition delay time complicatedly depends on temperature and pressure.The ethane blending ratio exerts a non-linear effect on ignition delay time of C2H6/H2 mixtures and NUIG Aramco Mech 1.3 well predicts the experimental data.The ignition delay time dependence on xc2H6 is explained by reaction pathway analysis and normalized H radical consumption analysis.