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利用低压层流预混火焰结合同步辐射真空紫外光电离技术和分子束取样质谱技术,探测到并计算了甲醇摩尔掺混比为0%、11%、28%和50%的甲醇/正庚烷/氧气/氩气火焰中62种燃烧中间产物和最终产物的摩尔分数。结果发现,甲醇的加入对正庚烷的消耗速率和大分子裂解没有影响,其主要作用表现在对C1和C2小分子摩尔分数的影响。甲醇的氧化速率比正庚烷快,故用甲醇替换一部分正庚烷后,整体氧化速率加快。甲醇的加入对甲基、乙炔、乙基、乙烷、乙烯酮有抑制作用,对甲醛和乙醛有促进作用。研究结果为今后机理验证模拟提供了实验依据。
Using low pressure laminar premixed flame combined with synchrotron radiation vacuum ultraviolet photoionization and molecular beam sampling mass spectrometry, methanol / n-heptane with molar proportions of methanol of 0%, 11%, 28% and 50% were detected and calculated / Mole fraction of 62 combustion intermediates and final product in oxygen / argon flames. The results showed that the addition of methanol had no effect on the rate of consumption of n-heptane and the cleavage of macromolecules. The main effect of methanol was on the molar fractions of small molecules C1 and C2. The oxidation rate of methanol is faster than that of n-heptane. Therefore, after replacing part of n-heptane with methanol, the overall oxidation rate is accelerated. The addition of methanol can inhibit methyl, acetylene, ethyl, ethane and ketene, and promote formaldehyde and acetaldehyde. The results provide experimental evidence for the mechanism validation simulation in the future.