Abstract
Laser-induced fluorescence in both theA−X andB−X band systems was used to measure absolute number densities of CH radicals in 40 Torr propane/air flames at temperatures near 1600 K. The fluorescence signal was calibrated against Rayleigh scattering in N2 and Raman scattering in H2. In a rich flame,Φ = 1.15, the concentration at the peak of the CH distribution was 5.8 ± 1.5 ppm, or (1.4 ± 0.4) × 1012 cm−3, with independent values obtained using both band systems and calibration methods in good agreement. This result compares well with a prediction of 8 ppm from a kinetic model of this flame.
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Luque, J., Crosley, D.R. Absolute CH concentrations in low-pressure flames measured with laser-induced fluorescence. Appl. Phys. B 63, 91–98 (1996). https://doi.org/10.1007/BF01112843
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DOI: https://doi.org/10.1007/BF01112843