Effects of Geometric Shapes of Atomization Enhancement Nozzle for Direct Injection Diesel Engine on Spray Characteristics

The purpose of this study is to improve the spray characteristics of the nozzle, which was developed in the previous study, for direct injection Diesel engins. The nozzle obtained excellent spray characteristics only by changing geometric shapes of the nozzle holes. In this study, the effects of geometric shapes of the nozzle holes on spray characteristics were examined. As a result, they were improved distinctively when the round inret shapes of the nozzle holes were settled, breakup length been short about 20 %, and spray angle been large about 50 %, compared with sharp shapes of the nozzle holes.