EHN和DTBP对汽柴油PPCI燃烧与排放的影响试验研究

Experimental Study on the Effects of EHN and DTBP on Dieseline Fuelled PPCI Combustion and Emissions

在一台单缸柴油机不改变喷油参数的条件下,对比研究了硝酸异辛脂(EHN)和二叔丁基过氧化物(DTBP)对汽柴油混合燃料部分预混压燃(PPCI)燃烧和排放特性的影响。研究结果表明:EHN和DTBP能够显著改善汽柴油混合燃料的低负荷着火性能。随着二者添加比例的提高,燃烧的着火时刻提前,燃烧相位靠近上止点,燃烧放热集中,缸内最大压力和最大压力升高率提高;随着二者添加比例的提高,NOx的排放增加,未燃HC和CO的排放降低,有效燃油消耗率降低。对比分别添加1%体积分数的EHN和DTBP的试验结果表明,同比例下EHN对G90低负荷着火能力的促进作用要比DTBP强。

Experiments on the effects of EHN and DTBP on dieseline fuelled PPCI combustion and emissions were carried out with a single-cylinder engine without changing the injection parameters. Results show that EHN and DTBP can significantly enhance the ignitibility of dieseline at low load range. As the additive proportion increases, the start of combustion and combustion phasing are advanced, heat release is concentrated, maximum pressure and maximum pressure rise rate increase, NO~ emission increases, UHC and CO emissions reduced, and the specific fuel consumption reduced. Results of EHN and DTBP, both adding 1% volume fraction to G90, show that EHN is more effective on the enhancement of G90 ignition ability than DTBP.