中文摘要：

采用同步辐射真空紫外光电离质谱技术作为测量手段，对正庚烷／甲醇／氧气／氩气富燃低压层流预混火焰进行了实验和模拟研究。结合文献记载的正庚烷火焰，针对包括苯及苯的前驱体在内的物质开展了对比研究。结果表明，甲醇的加入加快了整体燃烧进程，使得大多数中间物质最大摩尔分数降低，其出现的位置提前。随着脱氢裂解反应的深入，处于反应链下游的物质受甲醇加入的影响较小。苯的C4前驱体相比于C3前驱体受到甲醇的加入影响大，由物质生成率分析可知，火焰中苯的生成路径以C4＋C2为主。

英文摘要：

An experimental study of the fuel-rich low pressure premixed laminar n-heptane/methanol/ oxygen/argon flame was performed with the tunable synchrotron vacuum ultra-violet （VUV） pho- toionization and mass spectrometry. A literature n-heptane flame was adopted in the comparative study of the species include benzene and its precursors. The results show that, the addition of methanol can promote the combustion process, the maximum mole fraction of most of species is decreased, and the mole fraction profiles shift toward the burner surface. However, as the dehy- drogenation and dissociation reactions go further, the species in the down stream of reaction path are less affected by methanol addition. The C4 precursors of benzene are more sensitive to the addition of methanol compared with the C3 precursors. Finally, the rate of production （ROP） analysis shows that the formation path of benzene is attributed to be C4＋C2 rather than Ca＋Ca in these flames.