乙醇添加对直喷式汽油机微粒排放的影响

发布时间：2018-05-01 10:23

本文选题：内燃机 + 直喷式汽油机　；参考：《内燃机工程》2016年04期

【摘要】：在一台自然吸气式直喷式汽油机上开展了汽油添加乙醇对微粒浓度和粒径分布特性影响的研究。同时利用热重分析方法考察了乙醇汽油和汽油两种燃料生成的颗粒物碳烟的氧化活性。研究发现:添加乙醇会使得低负荷、低转速工况的微粒峰值浓度和微粒数目明显增加,主要原因是乙醇添加影响了燃油的雾化特性,导致雾化变差,缸内混合气不均匀;但是,对高速高负荷工况影响不大,随着负荷的增加,乙醇汽油微粒浓度降低,主要原因是高负荷时喷油压力高,乙醇添加对燃油雾化效果影响小,但乙醇的含氧有利于颗粒物的氧化。热重分析结果表明,乙醇汽油生成的颗粒物氧化起燃温度低于纯汽油生成的颗粒物,同时乙醇汽油生成颗粒物的氧化活化能也低于纯汽油的颗粒物。
[Abstract]:The effect of gasoline ethanol on particle concentration and particle size distribution was studied in a naturally aspirated direct injection gasoline engine. At the same time, the oxidation activity of particulate soot produced by ethanol gasoline and gasoline was investigated by thermogravimetric analysis. The results show that the peak concentration and the number of particles in low load and low rotational speed can be increased obviously by adding ethanol, which is mainly due to the influence of ethanol on the atomization characteristics of fuel, resulting in poor atomization and uneven mixture in the cylinder. It has little effect on the high speed and high load condition. With the increase of the load, the concentration of ethanol gasoline particles decreases, the main reason is that the fuel injection pressure is high at high load, and the effect of ethanol addition on the fuel atomization effect is small. However, the oxygen content of ethanol is beneficial to the oxidation of particulate matter. The results of thermogravimetric analysis showed that the initial combustion temperature of the particles produced by ethanol gasoline was lower than that of pure gasoline, and the activation energy of the particles produced by ethanol gasoline was also lower than that of pure gasoline.
【作者单位】：泛亚汽车技术中心有限公司;上海交通大学机械与动力工程学院;
【基金】：国家自然科学基金项目(51376117)
【分类号】：U464.171

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