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This paper presents the effect of CO 2  and N 2  dilution in the oxidizer stream on combustion and emission characteristics in a flameless combustor operating with kerosene and biodiesel as a fuel. The thermal input is varied from 30 kW (7.5 MW/m 3 ) – 53 kW (13.3 MW/m 3 ) and inlet air temperature are varied from 300 K to 800 K. CO 2 /N 2  are added to dilute the oxidizer stream in a proportion of 15% of total air volume to reduce the O 2  concentration in the air stream. Reacting and non-reacting flow simulations show that the flow field improves significantly as both the flow velocity and temperature distributions become uniform. Distribution of the reactant dilution ratio becomes more uniform and a maximum value of  R dil = 4.89 is achieved for 30 kW conditions. The reduced O 2  concentration in the oxidizer results in enhanced dilution of fresh air-fuel mixture thereby enables uniform temperature and flow field. For the air preheating case, CO 2  dilution does not affect the velocity and thermal fields significantly. The measured CO emissions are marginally increased due to CO 2  dilution; however, NO x  emissions are significantly reduced. N 2  dilution results in increased levels of NO x , contrary to the perception of the inert role of N 2  addition even though the combustor operating temperatures are lower than 1800 K. The measurements of acoustic pressure emissions show a sharp decrease during flameless combustion mode.

Effect of CO 2 /N 2 Dilution on Characteristics of Liquid Fuel Combustion in Flameless Combustion Mode