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中文摘要：
利用同步辐射单光子电离和分子束取样技术并结合飞行时间质谱仪,在低压、预混、燃油当量比为1.0的情况下研究含有正庚烷燃料层流火焰的燃烧特性.共进行了7组不同燃料的对比实验：正庚烷;正庚烷/MTBE（体积比1∶1）;正庚烷/乙醇（体积比1∶1）;异辛烷/正庚烷（体积比9∶1）;异辛烷/正庚烷/乙醇（体积比8.1∶0.9∶1.0）;异辛烷/正庚烷/MTBE（体积比8.1∶0.9∶1.0）;异辛烷（作为对比参照样品）.发现含正庚烷燃料燃烧中间产物均含有电离能为（9.14±0.1）eV、分子量为114的物质,无正庚烷燃料燃烧中间产物则未发现,根据光电离效率谱（PIE）和电离能查表初步断定为庚酮类物质.利用实验误差分析方法分析确定为2-庚酮、3-庚酮、4-庚酮,出现的相对概率分别为19.49%、55.37%和25.13%.检测与分析结果对发展正庚烷氧化机理提供了参考,同时在利用同步辐射探测预混层流火焰成分的实验中,对鉴别物质的方法进行了改进.
英文摘要：
Utilizing the synchrotron radiation single-photon ionization technique for molecular beam sampling time-offlight mass spectrometer（TOFMS）,the intermediates of the premixed n-heptane/oxygen/argon laminar flames with the equivalent rate of 1.0 were detected.The contrast tests among seven groups were performed,including n-heptane,n-heptane/MTBE（volumetric ratio 1∶1）,n-heptane/ethanol（volumetric ratio 1∶1）,isooctane/n-heptane（volumetric ratio 9∶1）,isooctane/n-heptane/ethanol（volumetric ratio 8.1∶0.9∶1.0）,isooctane/n-heptane/MTBE（volumetric ratio 8.1∶0.9∶1.0）and isooctane（as reference sample）.The substances with molecular weight of 114 and ionization energy of（9.14±0.1）eV were detected in all groups containing n-heptane,while none was found in the group without n-heptane.Those substances were identified as neptanone by the measurement of the photoionization mass spectrum and photoioniza-tion efficiency（PIE）spectra.Finally,with the help of experimental error analysis,the existence of 2-heptanone,3-heptanone and 4-heptanone with their relative probability of 19.49%,55.37% and 25.13% respectively was unambiguously confirmed.Suggestions are made,based on the results,on the development of current n-heptane oxidation mechanism.In addition,the methods of using synchrotron radiation technique to identify substances in laminer premixed flame are improved.
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