Abstract: The effect of the detergent additives on the properties of the diesel atomized droplets of the 0# diesel and the performance are investigated by the three-dimensional laser particles dynamic analyzer (PDA) and engine bench test. The PDA tests showed that with the increase of additive content, the droplets at the outlet of the nozzle tend to be distributed in the high-speed and small-size regions, and the proportion of the large droplets was decreased, and the proportion of small droplets was increased. With the increase of axial distance, the velocity of the atomized droplets decreased obviously whether or not the additive being added, while the droplets developed towards to the low speed and large particle size regions. Nevertheless, the distribution of the diesel atomized droplets containing additives was always less in the range of the large particle sizes, and the number, quality and velocity of the small droplets on the whole were better than that of the diesel without additive. The engine bench tests showed that the additive addition could effectively reduce the emissions of the pollutants (HC, CO, PM) and significantly reduce the air flow loss of engine nozzle.

Key words: detergent additives, diesel atomization, particle size distribution, velocity distribution, emission