Numerical analysis of the effect of injection pressure variation on free spray and impaction spray characteristics

摘要: Compression ignition direct injection diesel engines employed a high pressure system have been developed as measure to improve fuel efficiency and reduce harmful emissions. In order understand the effects of variation, many experimental works done, however there are difficulties get data in engine condition. This work gives numerical results for on spray characteristics wide or limited space with near walls. The gas phase is modelled by Eulerian continuum conservation equations mass, momentum, energy vapour fraction. liquid using discrete droplet model approach Lagrangian form drop behavior wall calculated new droplet-wall interaction based experiments observing individual drops. distributions, fractions flows shown various cases. free case which has no impaction, dispersion fraction increase sizes decrease increasing pressure. same phenomena appears more clearly impaction