Integrated computation of micro-cavitation in gasoline injector atomization

The effect of micro-cavitation on 3-D structure of liquid atomization process through a gasoline injector nozzle is numerically investigated and visualized by a new type of integrated CFD technique. The present CFD analysis focused on primary breakup phenomenon of a liquid column which is closely related to the micro-cavitation, the consecutive formation of liquid film, and generation of droplets of a lateral flow in the outlet section of the nozzle. The governing equations for high-speed lateral atomizing injector nozzle flow taking into account the micro-cavitation generation based on the Barotropic LES-VOF model in conjunction with the CSF model are presented, and then an integrated parallel computation are performed to clarify the detailed atomization process coincident with the micro-cavitation of a high speed nozzle flow. Furthermore, we acquire the data which is difficult to confirm by experiment such as aspects and volume fraction of micro-cavity, liquid core shapes, spray angle and spray velocity profiles.