Based on the finite stochastic breakup model (FSBM) of the airblast atomization process presented

the atomization process of coaxial two-fluid airblast atomizer with a large water/air mass flux ratio was investigated by using droplet breakup time and motion characteristics of droplet in air streams.The equation of Sauter mean diameter (SMD) with air jet velocity

water jet velocity and diameter

and water/air mass flux ratio was obtained.The experimental results of six coaxial two-fluid airblast atomizers with air and water were obtained by Malvern laser particle sizer of type 3600 measurement.The parameters in the equation of SMD were estimated according to the experimental results.The results showed that the theoretical analysis was reasonable and the relationship of SMD could be used to predict the SMD of coaxial two-fluid airblast atomizer with a large water/air mass flux ratio.