Absolute Concentration Measurements of Free Radicals in Flames by Absorption Spectroscopy.

摘要

Absorption spectroscopy techniques were used for measurement of absolute concentrations of free radical species in premixed, laminar, flat-flames of methane / nitrous oxide and CH4/nitric oxide/oxygen. Absolute concentration measurements were performed for the species hydroxyl radical, cyanide radical, and imino radical in 63 Torr flames. THese absolute concentration measurements were used to calibrate relative concentration profiles taken in previous experiments using laser-induced fluorescence (LIF) spectroscopy. Significant absorptions of these species could be obtained even in the very short path length flames studied. These measurements permit the experimental LIF measurement to be directly compared to the species concentration profiles predicted by the CHEMKIN/PREMIX flames modeling code.