| 摘要 |
<p>A combustion system for direct injection diesel engines, having a fuel injection nozzle (N) provided with upper and lower rows of nozzle holes and disposed so as to be opposed to a deep dish combustion chamber (A) of a small opening ratio, wherein the directions of the nozzle holes (1) in the upper row and those of the nozzle holes (2) in the lower row are set so that a fuel injected from the nozzle holes (1) and (2) impinges upon a side wall (3) and a bottom surface (4) respectively of the combustion chamber (A), a ratio of a fuel spray travel from the nozzle holes in the upper row to a diameter of each of these nozzle holes being set to 150-250, a ratio of a fuel spray travel from the nozzle holes in the lower row to a diameter of each of these nozzle holes being set to 100-180, a ratio of a total area of all of the nozzle holes in the lower row to that of all of the nozzle holes in the upper and lower rows being set to 0.25-0.35, the number of the upper nozzle holes (1) being set twice as large as that of the lower nozzle holes (2).</p> |
