Acta Phys. -Chim. Sin. ›› 1987, Vol. 3 ›› Issue (02): 136-140.doi: 10.3866/PKU.WHXB19870206

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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

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.