A Fully Automatic System for the Morphology Characterization of High Pressure Diesel Sprays

To reduce pollutant emission and increase performance of vehicles, the first step is before combustion, to understand and then to control the mixing process of fuel with air. It is well known that injection inside the combustion chamber is the key phenomenon. This paper focuses on the spray morphology in engine like conditions. A complete system has been built based on an optical diagnostic to visualize the sprays under nitrogen back pressure chamber. To measure spray parameters from the recorded images an entropic thresholding has been implemented. An automatic algorithm computes the spray tip penetration and cone angle from the rough images with a correction of the measurements depending on the hole injection angle.