Abstract
Effects of oxidizer preheating on the extinction of counterflow diffusion flame have been studied experimentally, considering oxidizer temperatures in the range 300K to 700K. Oxidizer and fuel were diluted with Ar, N_2 and CO_2. It is found that extinction limits can be divided into two distinct regimes. For the flame formed in the oxidizer side, extinction limits are sensitive to the O_2 concentration. On the other hand, for the flame formed in the fuel side, those are influenced of CH_4 concentration. The extinction limit increases with increasing the oxidizer preheat temperature.
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