Spray Characteristics of Group-Hole Nozzle for D. I. Diesel Engine

Abstract

Quantitative measurement of vapor and liquid phase concentration distributions in a D.I. Diesel spray, which was injected by a group-hole nozzle into the high-temperature and high-pressure nitrogen atmosphere in a constant volume vessel, was carried out by means of the ultraviolet-visible laser absorption-scattering (LAS) imaging technique. The group-hole nozzles, in which the minute holes are arranged at a minute interval, are one of the nozzle structures to control the mixture formation in the spray. It is expected that the group-hole nozzle spray has a smaller mean droplet size and enough tip penetration as compared with the spray injected by the single hole nozzle having the hole area equivalent to the group-hole. Spray and mixture formation characteristics of the group-hole nozzle were analyzed based on the LAS measurement.