中文摘要：

通过修改化学动力学软件CHEMKINⅢ,建立异辛烷均匀充量压缩点火（homogeneous charge compression ignition,HCCI）燃烧下排放特性数值模拟的多区模型.分析异辛烷HCCI燃烧下芳香烃（苯）与多环芳烃（萘、菲及芘）的生成及演变规律.采用异辛烷的燃烧与分解、多环芳烃生成的反应机理（包括115种组分,557个基元反应）进行计算.结果表明,碳氢排放主要来源于缝隙区及边界层区,而CO排放主要来源于边界层区;在各区达到着火时刻时,各区的苯、萘、菲及芘质量分数呈现先急升,再急降为一稳定值;同时,在这4种芳香烃排放中,苯的质量分数最高,萘其次,芘的排放基本为零.

英文摘要：

By amending the CHEMKIN III chemical kinetics package, a multi-zone model was built based on the emission characteristics of isooctane homogeneous charge compression ignition （HCCI） combustion. The formation and evolvement mechanisms of the aromatic （benzene） and polyeyelic hydrocarbons （ including naphthalene, phenanthrene and pyrene） in isooctane HCCI combustion were simulated in this model. The detailed reaction mechanisms of isooctane combustion and formation of the polycyclic aromatic hydrocarbons were adopted （ including 115 species and 557 reactions）. The results show the crevice zone and the boundary layer are the main source of the HC emission, while the CO emission is mainly from the boundary layer. At ignition timing, the mass fractions of benzene （A1 ）, naphthalene （ A2 ） , phenanthrene （A3 ） rapidly increases to a peak value, and subsequently, rapidly reducing to a steady value. However, the mass fraction of pyrene （ An ） is reduced to zero after reaching the peak value. Among these four aromatic and polycyclic hydrocarbons, the emission of A1 is the highest, A2, the next, and A4, almost zero.