物理化学学报 >> 1987, Vol. 3 >> Issue (02): 136-140.doi: 10.3866/PKU.WHXB19870206

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激光对火焰的诊断
Ⅲ. 激光诱导荧光法对液化石油气/空气火焰中的C2和CH基浓度分布的检测

倪图强; 聂绪建; 俞书勤; 孔繁敖   

  1. 中国科学技术大学近代化学系, 安徽合肥
  • 收稿日期:1985-09-03 修回日期:1986-04-14 发布日期:1987-04-15
  • 通讯作者: 孔繁敖

THE LASER DIAGNOSTICS OF FLAME
Ⅲ THE DISTRIBUTIONS OF C2 AND CHRADICALS IN A LPG/AIR FLAME MEASURED BY LASER INDUCED FLUORESCENCE TECHNIQUE

Ni Tuqiang; Nie Xujian; Yu Shuqin; Kong Fanao   

  1. Department of Chemistry; The University of Science and Technology of China; Hefei; Anhui
  • Received:1985-09-03 Revised:1986-04-14 Published:1987-04-15
  • Contact: Kong Fanao

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摘要： 通过对部份预混的富燃料液化石油气/空气火焰中各部份的C_2(A~(3Π)←→X~(3Π)和CH(B~(2∑)←X~(2Π), (A~(2Δ)→X~(2Π))的激光诱导荧光信号进行逐点检测, 首次获得了C_2(X)和CH(X)基在火焰中央纵剖面上的二维等浓度线分布图。它们的分布都在内焰锥形的壳层上, 而以锥顶区域最浓。C_2主要来自热解, 并可进一步聚成碳核。CH的形成是来自小自由基和含氧化合物的反应, 它进一步燃烧成终产物。

Abstract: Using laser induced fluorescence technique and shifting the position of the burner, two-dimensional concentration distribution diagrams of C_2(X) and CH(X) radicals in a part premixed, rich LPG/air flame were first obtained. The excita- tion and the detection bands were (0, 0) and (0, 1) of C_2(A~(3Π)←→X~(3Π)) transitions respectively, while for CH(X) species, the transition of B~(2∑), v′=0←X~(2Π), v″=0 was excited and the followed process A~(2Δ), v′=0→X~(2Π), v″=0 was detec- ted.
Both C_2(X) and CH(X) radicals concentrated in the thin layer of the inner cone of the flame and in an ellipsoid beyond the cone. C_2 was generated via pyrolysis and then agglomerated to form carbon particles. CH was produced from the reaction of small hydrocarbon radicals with oxygen and/or oxides in flame.