摘要
基于矩方法算法和预混火焰程序,实现一维预混火焰中汽油替代燃料燃烧生成碳烟的详细数值模拟.其中气相详细模型为包含多环芳烃(PAHs)生成机理的多组分汽油替代燃料反应动力学模型,详细碳烟颗粒相模型包含成核、凝并、PAHs表面沉积、表面生长和表面氧化过程.结果表明:燃烧过程中苯(C6H6)分子摩尔分数是影响PAHs生成的直接原因,决定了汽油替代燃料生成PAHs摩尔分数的大小;芘(C16H10)分子摩尔分数直接影响碳烟的生成过程,决定汽油替代燃料碳烟排放水平;可依据汽油替代燃料的组成评价燃烧生成PAHs和碳烟的水平,汽油替代燃料中甲苯/二异丁烯总含量越高,其生成PAHs和碳烟量越大,反之亦然.
Based on method of moments and laminar premixed flame code,a detailed numerical simulation of soot formation in one dimension premixed flame of gasoline-surrogate-fuel combustion was presented. The detailed gasphase reaction mechanism used is the chemical kinetic model of multi-components gasoline surrogate fuels including polycyclic aromatic hydrocarbons(PAHs)mechanism. The detailed soot model includes nucleation,coagulation,PAHs surface condensation,surface growth and surface oxidation. The results indicate that the benzene concentration is the most important direct factor for PAHs generation,which determines the value of PAHs concentration formed in gasoline-surrogate-fuel combustion. The pyrene concentration has a direct effect on the process of soot formation,which determines the soot emission for gasoline-surrogate-fuel combustion. Moreover,based on species and proportions of gasoline surrogate fuels,the PAHs and soot emission during combustion can be estimated. With the higher proportion of toluene and diisobutylene in gasoline surrogate fuels,the more PAHs and soot are generated during combustion.
引文
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