Spray and Combustion Characteristics of Diesel/Kerosene Blends Under Cold-Start Conditions

In this paper, the flow-type constant volume combustion bomb combined with Miescattering and direct photography methods was used to visually measure the spray and combustion characteristics of diesel/kerosene blends under low-temperature cold-start conditions. The results show that the liquid-phase spray penetration distance of diesel/kerosene blends decreases with the increase of kerosene blending ratio, temperature and density. The liquid-phase spray cone angle decreases and increases with the increase of kerosene blending ratio and ambient density, but is not sensitive to the change of ambient temperature. Under different ambient temperatures and densities, the ignition delay, the flame lift-off length and the blue flame accounts for the percent of the total flame strength of the blends show a trend of decreasing first and then increasing with the increase of kerosene blending ratio. In addition, the increase in ambient temperature and density results in a significant reduction in the ignition delays.