SP2-1 Analysis of Needle Eccentricity Effects on Internal Flow and Spray Characteristics of Enlarged VCO Diesel Injector(SP: Spray and Spray Combustion,General Session Papers)

Abstract

Numerical simulation of internal flow in VCO nozzle with respect to eccentric location of a needle is performed and compared with the experiment. Cavitation is created in the vicinity of the nozzle hole entrance, and swirl flow is generated in the nozzle hole by the eccentricity. As increasing the swirl, the type of the flow in the nozzle hole changes from solid state to hollow state due to an air entrainment into the nozzle hole. The swirl number and the spray cone angle are decreased in the hollow state. The simulation results indicate qualitative agreement with the experiment.