A numerical study of the effects of pressure fluctuations inside injection nozzle on high-pressure and evaporating diesel spray characteristics

摘要

Effects of injection pressure fluctuations on high-pressure and evaporating spray behaviour, especially under the representative modern diesel engine injection conditions, were carefully evaluated by using a well validated two-stage modelling approach. The numerical results indicate that as the injection pressure fluctuates more drastically both liquid and gas phase motions in the spray field will be more intensively disturbed. Furthermore, the injection pressure fluctuations have strong potential to enhance fuel/gas mixing processes inside high-pressure and evaporating diesel spray field.