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研究了定容燃烧器内中压喷射柴油喷雾的着火现象。结果表明,着火发生于喷束分裂前、接近喷束液柱表面活化反应领先一步的某一点,同时冲击板有助于表面着火。从这些结果可推断,当液柱表面的速度梯度减小到某一数值时,从液体表面汽化的燃油开始被活化而导致着火。从这一概念出发,提出了吹散极限着火模型。根据由这一模型得出的不同因子和燃烧滞后之间的函数关系,成功地推导出滞燃期试验式。其次,使用单缸机进行着火研究,揭示了根据上述模型能全面分析包括与O_2浓度有关的 EGR 率等诸多因素的影响。
The ignition phenomenon of medium pressure jet diesel spray in constant volume burners was studied. The results showed that the ignition occurred before the beam splitted and approached a point one step ahead of the surface activation reaction of the jet liquid column while the impact plate helped to ignite the surface. From these results, it can be inferred that when the velocity gradient of the liquid column surface is reduced to a certain value, the fuel vaporized from the surface of the liquid starts to be activated, resulting in ignition. Proceeding from this concept, a blow-up limit fire model is proposed. Based on the functional relationship between the different factors and the combustion hysteresis derived from this model, a test for the retarding period was successfully derived. Second, the study of ignition using a single cylinder engine reveals the full analysis of the effects of many factors, including the EGR rate associated with O 2 concentration, based on the above model.