Influence of Increased Diesel Fuel Spray Velocities and Improved Spray Penetration in DI Engines

Extensive research is in progress to reduce both nitrogen oxides (NOx) and particulate (soot) emissions from diesel engines due to environmental considerations. The present work is aimed at soot reduction by improvement of the combustion process using advanced fuel injection technologies and optimizing the combustion bowl.

Emission results are presented from an experimental study done on a DI diesel engine. The mass measurements of particulate emission are based on measurements of smoke and HC emissions, which provides a less expensive way of carrying out preliminary combustion optimization work [2]. It is concluded that higher spray penetration with the help of advanced nozzle technology coupled with the optimum combustion system accounts for a significant reduction of soot emissions. The understanding gained from the experiments can be used for optimizing diesel combustion systems for improved emissions and fuel consumption.