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中文摘要：
采用数值模拟的方法研究正庚烷低压预混层流燃烧火焰,分析了正庚烷化学反应路径及燃烧产物,考察了OH,O,H自由基的摩尔分数变化,比较了火焰中同类烷烃、烯烃和炔烃摩尔分数,通过C2H4的敏感性分析探讨了燃烧火焰中烯烃生成和消耗路径.结果表明：随火焰高度的增加,H2O、CO和CO2摩尔分数增大,火焰高度1.3cm以后,CO的摩尔分数开始下降,对应的CO2摩尔分数迅速增加.OH,O,H自由基摩尔分数的最大量级为10-4～10-3,OH,O,H自由基摩尔分数的迅速增大反映燃烧中间产物的消耗反应较剧烈.正庚烷燃烧火焰烯烃生成较多,C2烯烃摩尔分数的峰值分别是同类烷烃和烯烃的32、85倍,C3烯烃的摩尔分数的峰值是同类炔烃72倍.
英文摘要：
A numerical study on low-pressure premixed N-heptane laminar flame was conducted.This work focused on both the chemical reaction path and the combustion intermediate.Therefore,mole fraction variation of OH,O,and H radicals were analyzed,and the resultants of similar olefirs,alkanes,and alkynes in the flame were compared.The numerical result showed that with the increase of flame height,H2O,CO and CO2 mole fraction increased,after the flame height 1.3cm,CO mole fraction began to decrease,correspondingly CO2 mole fraction increased rapidly,and CO was oxidized to CO2 The maximum magnitude of the mole fraction of OH,O,and H radicals were 104～10-3.The rapid increase reflected that the reaction of combustion intermediate consumption was severe.The comparison of resultants revealed that generation of olefins in low-pressure premixed N-heptane laminar flame were more than other resultants,which the peak of mole fraction of C2 Olefin are respectively 32 and 85 times more than similar alkanes and olefins,likewise,7.2 times much more than the same kinds of alkynes compared to C3 Olefin.
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