NOx emission, as one the main pollutants resulting from fossil fuel combustion, have been always studied by researchers in the field of combustion. One of the methods to reduce the NOx emission is dilution. Dilution increases the heat capacity of the mixture in the combustion chamber, which in turn, decreases the temperature of the combustion chamber and consequently, the NOx emission decreases. In this paper experimental investigation of nitrogen dilution effects on NOx emission production in propane-air non-premixed flame in a cylindrical combustion chamber is conducted. Dilution is performed over a wide range of dilution and equivalence ratios. Results show nitrogen dilution decreases NOx emission with an average of 64%.

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