Characterization of the Reaction Zone in a Flameless Combustor (original) (raw)

Abstract

The combustion and pollutant characteristics of a small-scale laboratory combustor operating under flameless oxidation conditions are examined with the aid of OH* chemiluminescence images and measurements of local mean gas temperatures and local mean major gas species (O2, CO2, CO, unburnt hydrocarbons and NOx) concentrations along the combustor axis, as a function of the fuel (methane) thermal input, which was varied between 7 and 13 kW. The results show that the combustor, operating under flameless conditions, yields very low NOx (< 6 ppm@15% O2) and CO emissions (< 14 ppm@15% O2) regardless of the fuel thermal input. As the fuel thermal input increases, the main reaction zone, as typified by the OH* chemiluminescence intensities, enlarges and, simultaneously, moves progressively closer to the combustor exit mainly due to the increase in the central air jet momentum. Moreover, as the fuel thermal input increases the OH* intensity gradients within the increasingly larger reac...

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