Spray Angle Prediction Method Characterizing Internal Flow of Diezel Nozzle by Spray Behavior near the Nozzle

Abstract

A simple prediction method of a diesel spray angle was developed, considering internal nozzle flow characteristics which vary depending on nozzle specifications. Spray behavior near a nozzle was observed as an area to correlate internal and external nozzle flows. Therefore, the method predicts a spray angle directly from internal nozzle flow characteristics obtained by CFD (Computational Fluid Dynamics). The method also involves the effects of a needle lift on the spray angle as well as nozzle hole geometries (e.g. a diameter and a length) which have been used in conventional methods.