In this study, numerical simulation has been conducted for the spray injected from a slit nozzle injector for a direct gasoline engine. The droplets in the spray were investigated by the combination of Large Eddy Simulation (LES) and Lagrangian Discrete Droplet Model (DDM). Droplets are atomized through the primary breakup induced by the instability of the liquid surface and secondary breakup induced by relative velocity between droplet and surrounding gas. This paper applies three secondary breakup models to an injector spray flow and evaluates their results compared with experimental data.
