喷油参数对PODE、DMC掺混柴油燃烧和排放特性的影响

以柴油中添加相同氧含量(质量分数6.26%)的聚甲氧基二甲醚(PODE)和碳酸二甲酯(DMC)为研究对象，对比研究了柴油以及添加酯类和醚类燃料的柴油在不同喷油压力和主-预喷间隔角条件下的燃烧和排放特性。结果表明：随着喷油压力增大，柴油、PODE/柴油、DMC/柴油燃料的总碳氢化合物(THC)和碳烟排放降低，总颗粒物的质量浓度降低，颗粒物几何平均直径(GMD)减小；纯柴油和PODE/柴油的CO排放量先升高后降低，而DMC/柴油的CO排放量先降低后升高；随着主-预喷间隔角的增大，3种燃料的碳烟排放降低，CO和THC排放量增加，颗粒物GMD减小，颗粒物的质量浓度降低。PODE和DMC 2种含氧燃料的加入能有效降低柴油碳烟排放，但随着喷油压力升高或主预喷间隔角的增大，碳烟排放降低的潜力变小；其中PODE具有同时降低NO_x和碳烟的潜力，但添加DMC会使NO_x排放略有增加。

Influence of Fuel Injection Parameters on Combustion and Emission Characteristics of PODE and DMC Mixed Diesel

The combustion and emission characteristics of diesel, diesel with the polyoxymethylene dimethyl ether (PODE), and diesel with di-methyl carbonate ester (DMC) having the same oxygen mass fraction (6.26%) were studied under different injection pressures and main pre-spray interval angles. The results show that with the increase of injection pressures, the total hydrocarbon (THC) and soot emissions of diesel, PODE/diesel and DMC/diesel decrease, the mass concentration of total particulate matter decreases, and the geometric mean diameter (GMD) of particles decreases. The CO emissions of pure diesel and PODE/diesel first increase and then decrease, while that of DMC/diesel first decrease and then increase. With the increase of the main pre-injection interval angle, soot emission of three fuels decreases, CO and THC emission increases, GMD of particulate matter decreases, and particulate matter mass concentration decreases. The addition of two oxygen-containing fuels can effectively reduce soot emission. However, with the increase of pressure or the increase of the main pre-spray interval angle, the potential of soot emission reduction becomes weak. PODE has the potential to reduce NO_x and soot emission at the same time, while the addition of DMC will increase NO_x  emission slightly.