Emissions from Gas Turbine Combustors : Part 1, An Experimental Study on a Model Combustor

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The distributions of temperatures and species concentrations within a small combustor of can-type were measured for the inlet air temperatures of 320 and 430 K and for various swirler vane angles. A higher inlet air temperature accelerated the combustion process in the primary zone, the resultant higher temperature level throughout the combustor reducing the emission of carbon monoxide. No significant difference in nitric oxide emission, on the other hand, was observed in the range of inlet air temperatures studied. The concentration of carbon monoxide decreases more rapidly as a greater part of the combustion process takes place in the upstream part of the combustor. The formation process of nitric oxide is also affected by the combustion process but in a more complicated manner.
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