Abstract
The effects of oxidizer preheating and dilution levels of fuel and exygen on the extinction and structure of counterflow CH4-O2-Ar diffusion flame were investigated experimentally and numerically. The oxidizer temperature of both experiments and calculations were varied up to 1100 K. The oxidizer preheating significantly contributes to expansion of the extinction limits. The oxidizer preheating and the dilution levels are characterized by the magnitude of stoichiometric mixture fraction (Fst). The extinction limit curves can be roughly divided into two regions based on the magnitude of Fst. In the region about Fst 0.5, which the flame is located to the fuel flow, the expansion of reaction zone with preheating is almost small. Only small effects of the oxidizer preheating to the extinction limits are observed in this region. As the results, the flame location is quite important factor to understand the effects of dilution levels and oxidizer preheating on the extinction phenomena.
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