Investigation of the effects of cavitation on near nozzle dynamics in multi-hole gasoline direct injection sprays

The accurate control of the the spray dynamics arising from the nozzle in GDI injectors is key in order to control the subsequent combustion process. In this work we present LES of in nozzle dynamics of gasoline direct injection and the resulting early development of spray plumes from an 8-hole injector (ECN Spray G). In order to do so a new three fluid solver within OpenFOAM has been developed. The objective is to evaluate the impact of the cavitation in a multihole gasoline injector, along with its influence on the flow field at the start of injection. It is shown how the interaction between the gaseous phases can influence the initial stages of the spray formation and the different pattern of cavitation across the injectors holes.