Combustion characteristics of alternative gaseous fuels
Combustion characteristics of alternative gaseous fuels
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DOI：
10.1016/j.proci.2010.06.116
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
O. Park;P. Veloo;Ning Liu;F. Egolfopoulos
中科院分区：
文献类型：
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作者：
O. Park;P. Veloo;Ning Liu;F. Egolfopoulos
对空气与氢气、一氧化碳和C1-C4饱和烃混合物的基本火焰特性进行了实验研究和数值模拟。选择燃料混合物是为了模拟替代气体燃料，并深入了解燃料混合物氧化过程中潜在的动力学耦合。这些研究包括使用的逆流配置的层流火焰速度的测定，以及熄灭和预混火焰的点火极限。使用USC Mech II动力学模型对实验进行建模。据确定，当碳氢化合物作为添加剂添加到氢火焰中时，火焰点火、传播和熄灭以违反直觉的方式受到影响。更具体地，发现通过在氢火焰中用丙烷或正丁烷取代甲烷，混合物的反应性在预燃和剧烈燃烧条件下都降低。这种行为源于丙烷和正丁烷产生更多的甲基自由基，这些甲基自由基可以很容易地与原子氢重新结合，从而降低H+O2→O+OH分支反应的速率。该动力学模型预测密切的实验数据，火焰传播和熄灭的各种燃料混合物和压力，以及在燃料混合物中的各种量的二氧化碳。另一方面，一般来说，它低估了点火温度。
Fundamental flame properties of mixtures of air with hydrogen, carbon monoxide, and C1–C4saturated hydrocarbons were studied both experimentally and numerically. The fuel mixtures were chosen in order to simulate alternative gaseous fuels and to gain insight into potential kinetic couplings during the oxidation of fuel mixtures. The studies included the use of the counterflow configuration for the determination of laminar flame speeds, as well as extinction and ignition limits of premixed flames. The experiments were modeled using the USC Mech II kinetic model. It was determined that when hydrocarbons are added to hydrogen flames as additives, flame ignition, propagation, and extinction are affected in a counterintuitive manner. More specifically, it was found that by substituting methane by propane or n-butane in hydrogen flames, the reactivity of the mixture is reduced both under pre-ignition and vigorous burning conditions. This behavior stems from the fact that propane and n-butane produce higher amounts of methyl radicals that can readily recombine with atomic hydrogen and reduce thus the rate of the H+O2→O+OH branching reaction. The kinetic model predicts closely the experimental data for flame propagation and extinction for various fuel mixtures and pressures, and for various amounts of carbon dioxide in the fuel blend. On the other hand, it underpredicts, in general, the ignition temperatures.