Abstract
Diesel engine is lifted in terms of high thermal efficiency, reduction of carbon dioxide. The purpose of this study is to improve spray and flow characteristics of nozzle for direct injection Diesel engine by using cavitation phenomena in the nozzle hole, which is considerably affected to atomization of spray. As a result, it was obtained the results that when the atomization enhancement nozzle with round inlet cutting was used, spray characteristics was improved, spray angle becomes large about two times, Sauter mean diameter was obtained 20μm order and volumetric flow rate was large about 40 % compared with the nozzle invented in the previous this study. Moreover, when the each nozzle holes of the multi-hole nozzle were inclined at 45 deg., spray angle becomes considerably large about over 100 deg., and high-dispersion spray was obtained.
