DMC与DIPE对汽油机燃烧及排放性能影响试验

Experiment on the Influences of Antiknock DMC and DIPE on Gasoline Engine Combustion and Emissions Characteristics

选用碳酸二甲酯(DMC)和二异丙醚(DIPE)作为汽油抗爆剂,均按体积分数3%、6%分别添加到93号汽油中,研究其抗爆性能。在发动机试验台架上,通过测量缸压、燃油消耗率、排放等数据,研究添加不同体积分数DMC和DIPE的汽油对发动机燃油经济性、燃烧特性和排放特性的影响。试验结果表明,在添加体积分数为3%时,DMC和DIPE使燃油消耗率平均增加0.85%和1.6%,添加体积分数为6%时,DMC和DIPE使燃油消耗率平均增加3.7%和1.3%;缸压峰值点都出现下降,最大放热点推迟,在低负荷表现更为明显;HC排放都得到显著改善,DMC改善NOx排放。

MTBE will pollute the groundwater, and it is urgent to find its alternatives. Dimethyl carbonate （DMC） and diisopropyl ether （DIPE） were selected as gasoline antiknocks, which added to 93 gasoline by 3% and 6% volume fraction respectively, and then their antiknock characteristics were studied by experiment. The effects of different volume fraction DMC and DIPE on gasoline engine fuel economy, combustion and emissions characteristics were obtained by measuring cylinder pressure, fuel consumption and emissions data through engine test-bed. The results show that DMC and DIPE lead to fuel consumption increasing 0.85 % and 1.6 % respectively at 3 % volume fraction, and 3.7 % and 1.3% respectively at 6% volume fraction. The peak value of cylinder pressure drop is decreased and the largest release heat point is postponed, especially at low loads. The HC emissions are lowered significantly and DMC reduces the NOx emissions.