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The in situ, high spatial resolution, two-dimensional distributions of OH(X), C_2(X) and CH(X) radicals in premixed paraffin/air flames are first reported. The measurements were done with the laser-induced fluorescence spectroscopies (LIFS) of the transitions of OH(A~Σ~+←→X~2Π), C_2(A~3Π←→X~3Π) and CH(B~2Σ←→X~2Π), (A~2△→X~2Π). The results show that OH(X) populated the edge of the outer flame, while C_2(X) and CH(X) the edge of the inner cone of the flame.The local rotational temperature of OH radical for a small zone was detected by the saturated laser-induced fluorescence spectroscopy of A~2Σ~+, v′=0←→X~2Π, v=″0 transition. The two-dimensional temperature distribution for the flame was measured through moving the position of the burner.
The in situ, high spatial resolution, two-dimensional distributions of OH (X), C_2 (X) and CH (X) radicals in premixed paraffin / air flames are first reported. The measurements were done with the laser- induced fluorescence spectroscopies LIFS) of the transitions of OH (A~Σ ~ + ← → X ~ 2Π), C_2 (A ~ 3Π ← → X ~ 3Π) and CH (B ~ 2Σ ← → X ~ 2Π) X ~ 2Π). The results show that OH (X) populated the edge of the outer flame, while C_2 (X) and CH (X) the edge of the inner cone of the flame. The local rotational temperature of OH radical for a Small zone was detected by the saturated laser-induced fluorescence spectroscopy of A ~ 2Σ ~ +, v ’= 0 ← → X ~ 2Π, v = "0 transition. The two-dimensional temperature distribution for the flame was measured through moving the position of the burner.