ATOMIZATION AND AIR-ENTRAINMENT CHARACTERISTICS OF UNSTEADY DENSE SPRAYS

Sauter mean diameter and air-entrainment characteristics of nonevapora ting unsteady dense sprays are measured by means of an image analysis technique which uses an instantaneous shadow picture of the spray and amount of injected fuel. Influences of injection pressure and ambient gas density on Sauter mean diameter and air entrainment are investigat ed parametrically. An empirical equation for the Sauter mean diameter is proposed based on a dimensionless analysis of the experimental resu lts in which Sauter mean diameter decreases with an increase in inject ion pressure and a decrease in ambient gas density. It is also shown t hat the air-entrainment characteristics can be predicted from the quas i-steady jet theory.