为充分发挥Fischer-Tropsch (F-T)煤制油的性能，在1台高压共轨柴油机上对比分析了使用F-T煤制油和国六0号柴油时的燃烧和循环变动特性，并探究了参数间的相关性，选择1 200，2 000，2 800 r/min下的外特性工况作为试验工况。结果表明：F-T煤制油的缸压、放热率和压力升高率均比0号柴油低，但峰值对应的相位提前；相比于0号柴油，在相同的工况下F-T煤制油滞燃期缩短0.7°~1.2°曲轴转角，燃烧时间增加6°曲轴转角，CA50提前2°曲轴转角，有效热效率提高0.7%~1.5%；柴油机燃用F-T煤制油时循环变动较小，在2 000 r/min时循环变动最小，缸压峰值随着滞燃期的增加而线性增加，随着燃烧持续期的增加而线性减小，一定范围内缩短滞燃期、延长燃烧持续期能够减少循环变动；同时滞燃期与缸压峰值的Pearson相关系数大，较燃烧持续期对循环变动的影响更显著。
The combustion and cycletocycle variation characteristics of Fischer-Tropsch (F-T) diesel and ChinaⅥ 0# diesel were investigated to improve the efficiency of F-T diesel on a high pressure common rail diesel engine under the full load conditions of 1 200, 2 000 and 2 800 r/min. Then the correlation between them was discussed. The results showed that the incylinder pressure, heat release rate and pressure rise rate of F-T diesel were lower than that of 0# diesel, but the phases of their peaks advanced. The ignition delay shortened by 0.7°CA～1.2°CA, the combustion duration increased by 6°CA, CA50 advanced by 2°CA, and the brake thermal efficiency increased by 0.7%～1.5% after using F-T diesel. Besides, the cycle-to-cycle variation of FT diesel reduced and got the minimum at 2 000 r/min. The incylinder peak pressure increased linearly with the increase of ignition delay and decreased with the increase of combustion duration. At a certain range, shortening the ignition delay and prolonging the combustion duration could improve the cycle-to-cycle variation. The ignition delay had a higher Pearson's correlation with incylinder peak pressure than combustion duration and hence produced a greater influence on cycle-to-cycle variation.
