论文部分内容阅读
为了更好地弄清燃油组分对发动机排气碳氢的影响，在一台单缸发动机上开展了燃用汽油－正已烷和汽油－二甲苯混合燃料的研究，利用ＦＩＤ测量了总碳氢排放量。研究了不同混合比例下汽油－正已烷和汽油－二甲苯混合燃料对发动机碳氢排放的影响。给出了混合燃料与商品汽油的排放对比。研究结果表明：汽油－正已烷混合燃料较汽油碳氢排放低，汽油－二甲苯混合燃料较汽油碳氢排放高。认为亨利常数、扩散系数和蒸馏温度决定了燃油组分引起的缸内未燃碳氢数量。指出燃油组分对发动机碳氢排放有很大的影响。碳氢排放量与汽油中正已烷或二甲苯掺混比例成线性变化关系。汽油中正已烷增加１０％碳氢排放降低２×１０－４Ｃ，汽油中二甲苯增加１０％碳氢排放会增加２．２×１０－４Ｃ。
In order to better understand the effect of fuel components on the engine exhaust hydrocarbon, a study was conducted on a single-cylinder engine using gasoline-n-hexane and gasoline-xylene blends. FID was used to measure total carbon Hydrogen emissions. The effects of gasoline-n-hexane and gasoline-xylene mixed fuel on the engine’s hydrocarbon emissions under different mixture ratios were studied. A comparison of emissions from blended fuels and commercial gasoline is given. The results show that gasoline-n-hexane hybrid fuel has lower emissions than gasoline and gasoline-xylene fuel has higher hydrocarbon emissions than gasoline. The Henry constant, diffusion coefficient, and distillation temperature are thought to determine the amount of unburned hydrocarbons in the cylinder caused by the fuel component. Pointed out that the fuel components have a great impact on the engine’s hydrocarbon emissions. The amount of hydrocarbon emissions is linearly related to the proportion of n-hexane or xylene in gasoline. Gasoline n-hexane increased by 10% of hydrocarbon emissions reduced by 2 × 10-4C, gasoline xylene increased by 10% of hydrocarbon emissions will increase 2.2 × 10-4C.