Pilot Injection Timing Effect on the Main Injection Development and combustion in a DI Diesel Engine

The liquid and vapor phases penetrations are important improvement parameters of DI Diesel combustion chamber conception. In this study the effects of the pilot injection timing on the main injection evolution and combustion are investigated using laser based optical diagnostics and 3D modeling. The pilot injection timing is shown to have a strong effect on the main liquid and vapor phases development and these results are more precisely depicted using 3D calculations. The mixing stated derived from laser induced fluorescence and thus the pilot injection combustion process are studied and are also shown to influence the main injection inflammation. These tendencies provide interesting insights in the comprehension of the physical phenomena occurring in a DI Diesel engine of production size.