Abstract
This work was concerned at the oxidation of soot. An experimental study was made of two-dimensional visualization on soot particles and OH in diffussion/premixed flames by laser sheet. The soot volume fractions were obtained from the scattered light intensity of the soot by LLS (Laser-Light Scattered) method. OH distribution was measured by Planar Laser-induced Fluorescence (LIF) method. Quantitative laser measurements of OH in the zone of soot oxidation was made difficult by the presence of soot particles, which induced partial extinction and elastic scattering of the laser radiation. To improve the accuracy of the OH fluorescence signal, the spiked noises were reduced by the average of 25 shots measurements.Along the flame' s axis and radial distance, profiles of OH and soot concentrations were obtained over the zone where soot oxidation took place. The peak of the soot concentration was located just inside the position of the OH concentration peak (flame front), which indicated that soot was produced in the fuel rich region near the peak of the OH concentration. When the OH concentration was raised, the soot burnout rate increased.
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