Soot formation in flames of model biodiesel fuels
Soot formation in flames of model biodiesel fuels
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DOI：
10.1016/j.combustflame.2012.01.003
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发表时间：
2012-05
影响因子：
4.4
通讯作者：
Qiyao Feng;Aydin Jalali;A. Fincham;Y. Wang;T. Tsotsis;F. Egolfopoulos
中科院分区：
文献类型：
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作者：
Qiyao Feng;Aydin Jalali;A. Fincham;Y. Wang;T. Tsotsis;F. Egolfopoulos
系统地研究了一类模型生物柴油的非预混火焰，即脂肪酸酯类燃料的结焦特性。采用激光消光法测量了不同燃料/氮气摩尔比和大气压下逆流构型的碳烟体积分数。将实验数据与碳数相近的正构烷烃火焰和代用柴油的火焰进行了比较。对于所审议的所有情况，如预期的那样，确定了碳烟体积分数随着燃料浓度的增加而增加。此外，与相应的正构烷烃相比，模型生物柴油燃料产生的碳烟显著减少。此外，还进行了其他实验研究，以评估碳数、酯基类型(甲基或乙基)和饱和程度对这些模型生物柴油燃料火焰的碳化倾向的影响。利用最近开发的三个化学动力学模型来模拟火焰，从而研究控制C2H4和两个关键的碳烟前体C2H2和C3H3的形成的动力学路径，旨在深入了解通过实验观察到的不同燃料火焰之间的碳烟倾向的差异。
The sooting propensities of non-premixed flames of a class of model biodiesel fuels, namely fatty acid esters, were studied systematically. Soot volume fractions were measured using the laser extinction method in the counter-flow configuration, for different fuel/N2molar ratios and atmospheric pressure. The experimental data were compared against those obtained in flames of n-alkanes with similar carbon numbers and a flame of a surrogate diesel fuel. For all cases considered, it was determined that the soot volume fraction increases with the fuel concentration, as expected. Furthermore, the model biodiesel fuels were shown to produce significantly less soot compared to the corresponding n-alkanes. Additional experimental studies were carried as well, in order to assess the effects of carbon number, type of ester group (methyl or ethyl), and extent of saturation on the sooting propensity of flames of these model biodiesel fuels. Three recently developed chemical kinetic models were utilized to model the flames and thus investigate the kinetic pathways controlling the formation of C2H4and two key soot precursors, namely C2H2and C3H3, aiming to provide insight into the experimentally observed differences in the sooting propensity among the flames of the various fuels that were considered.