Abstract
Droplet collision in a diesel spray has been studied through observation of binary collision of two equivalent droplets of the same kind. In a direct water injection (DWI) system, a two-needle injector may produce considerable collisions between fuel and water droplets, and because of the near co-axial nozzle hole layout. In this study, the empirical criteria were directly adopted into KIVA3 code. This was divided into bounce, coalescence and separations after the collision of two droplets of any kind. The effective entrainment of water into fuel spray was numerically captured in the DWI system of the two-needle injector. The results were partially confirmed through observation of the actual DWI spray in a constant volume bomb.
