Abstract:
Results of an experimental study of the effect of addition of ян$_2$ 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 ян$_2$ 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 ян$_2$ admixture in the fuel in amounts greater than the fuel flow rate up to $\approx$1.5 times on the characteristic combustion time are obtained.
Keywords:fuel jet, characteristic combustion time, lift-off, lift-off length, normal flame velocity, criterial description.