The micro-structure of laminar premixed, atmospheric-pressure, fuel-rich flames of n-heptane/oxygen/argon has been studied at two equivalence ratios (C/O = 0.63 and C/O = 0.67). A heated quartz microprobe coupled to an online gas chromatography/mass spectrometry (HP 5890 Series II/HP 5972) has been used to establish the identities and absolute concentrations of stable major, minor, and trace species by the direct analysis of samples withdrawn from the flames. Benzene was the most abundant aromatic compound identified. The largest PAH detected were the family of C18H10 (molecular weight of 226) that include cyclopenta[cd]pyrene and benzo[ghi]fluoranthene, with peak concentrations reaching 8 ppm and 6 ppm, respectively. Soot particle diameters, number densities, and volume fractions were determined using classical light scattering and extinction measurements. The largest soot particle diameter measured was about 18 nm and the soot volume fraction reached the amount of 4.9 × 10-7.
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机译：在两个当量比（C / O = 0.63和C / O = 0.67）下研究了正庚烷/氧气/氩气的层流预混，常压，富燃料火焰的微观结构。加热的石英微探针与在线气相色谱/质谱联用（HP 5890 Series II / HP 5972）已用于通过直接分析从色谱柱中提取的样品来确定稳定的主要，次要和痕量物质的身份和绝对浓度。火焰。苯是鉴定出的最丰富的芳香族化合物。所检测到的最大PAH是C18H10家族（分子量为226），其中包括环戊并[cd] re和苯并g荧蒽，其峰值浓度分别达到8 ppm和6 ppm。使用经典的光散射和消光测量来确定烟尘的粒径，数量密度和体积分数。测得的最大烟灰粒径约为18 nm，烟灰体积分数达到4.9×10-7。
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