【摘要】 在一台改造的4缸柴油机的第4缸进行均质压燃(HCCI)燃烧试验,研究了添加剂对HCCI燃烧过程的影响。试验结果表明,在HCCI燃烧稳定工况下,没有添加剂的基础燃料PRF90(相当于90号汽油)着火滞后,燃烧放热峰值低,而混有添加剂的基础燃料则着火明显提前,燃烧放热峰值升高。在相同循环喷油量和相同转速的条件下,随着添加剂质量分数的增加,HCCI着火和燃烧放热提前,燃烧放热峰值提高,但过高的添加剂质量分数会使得发动机爆震,工作粗暴。更多还原

【Abstract】 The experimental investigation of the effect of fuel additives on HCCI combustion process was carried out on a 4-cylinder diesel engine of which the fourth cylinder was modified to run in HCCI mode. The experimental results indicated that under the steady operating conditions, the ignition timing of the base fuel PRF90 (90% iso-octane+10% n-heptane), which is equivalent to RON 90, delays and the peak value of the heat release rate of the base fuel is low compared with the base fuel with additives which advances ignition timing and increases the peak of the heat release rate obviously. At the conditions with the same fuel injection quantity per cycle and the same engine speed, with the increase of the additive mass fraction in the fuel, the ignition and heat release timings bring forward and the peak of heat release rate increases. However, excessive additives will make the engine be prone to knock and run rudely.更多还原