STUDY ON SECONDARY ATOMIZATION OF LIQUID FUEL AT THE LIP OF THE FLAMEHOLDER

An experimental investigation of secondary atomization of liquid fuel at the lip of the flameholder has been completed by means of Malvern Particle Sizer.This secondary atomization has several features:Fine droplets occur in the high speed air flow side,while gross droplets occur in the recirculation zone side;the velocity of air flow(V a)has a predominant influence on the mean drop size(MMD)of the spray,the effect may be expressed quantitatively as MMD∝V -1 75 a.The mechanism of the secondary atomization may be described as follows:Some of the liquid drops in the spray are gathered by the flameholder and form a fuel film in its surface,the air flow forces the wavy film to move forward to the lip of the flameholder,further the fuel film breaks up at flameholder lip under a pincer attack of high speed turbulent flow and low speed recirculation flow.