Abstract
The aim of this study is to clarify the characteristics of diesel spray and spray flame injected with the ultra-high injection pressure of 350MPa. From the shadowgraph images obtained in a constant volume vessel, spray-tip penetration, spray cone angle, spray volume and mean equivalence ratio in a spray were analyzed. The results show that with increasing the injection pressure up to 350MPa, larger scale vortex was produced in a shear layer between spray and ambient air. As the result of the enhanced turbulent mixing, the mean equivalence ratio was decreased at the same spray-tip penetration within a short time.
