Effect of addition of CO2 to the fuel on combustion of gas jets in air

Results of an experimental study of the effect of addition of CO2 to methane and to a propane-butane mixture on conditions of stabilization of the diffusion flame in air are reported. It is shown that the flame lift-off length substantially increases with increasing fraction of CO2 in the fuel; the main reason is the changes in the velocity and concentration in the region of the “ignition” points; a secondary factor is an increase in the characteristic combustion time. Data on the influence of the CO2 admixture in the fuel in amounts greater than the fuel flow rate up to ≈1.5 times on the characteristic combustion time are obtained.