【摘要】 采用零碳氨与柴油双燃料燃烧以拓展氨燃料的运行工况，研究了氨柴双燃料发动机当量比燃烧排放特性，并与稀燃条件下的燃烧特性进行了对比。结果表明：在理论空燃比条件下，氨柴双燃料的燃烧速度比纯柴油模式快，燃烧持续期明显短于纯柴油模式。相比于稀燃条件，在过量空气系数越靠近理论空燃比和氨能替代率越大时，燃烧持续期缩短效果越明显。氨柴双燃料燃烧能够提高发动机功率密度且指示热效率高于纯柴油模式。在排放方面，氨柴双燃料的NO_x排放在3.4 g/(kW·h)以下，较低氨能量替代率下的NOx排放低于纯柴油模式，但氨燃烧效率整体较低，需要控制未燃氨排放；和纯柴油相比，氨柴双燃料在70%氨能量替代率时，凝聚态颗粒数排放能够减少97%以上。更多还原

【Abstract】 By employing a dual-fuel combustion system utilizing zero-carbon ammonia and diesel, the combustion and emission characteristics of ammonia-diesel dual-fuel engine were investigated under various stoichiometric ratios. The characteristics of the condition of stoichiometric and lean burn combustion were compared. The results indicate that under the stoichiometric ratio conditions, the combustion speed of ammonia-diesel dual-fuel is faster than that of pure diesel, with significantly shorter combustion duration.Compared with non-stoichiometric conditions, when the excess air coefficient is closer to the stoichiometric ratio and the ammonia energy replacement rate is larger, the combustion duration is shortened more obviously.Additionally, the ammonia-diesel dual-fuel combustion enhances engine power density and exhibits higher indicated thermal efficiency compared to pure diesel mode. Regarding emissions, NO_x emissions from ammoniadiesel blended fuel are below 3. 4 g/(kW·h), with emissions under low ammonia energy substitution rate being lower than pure diesel mode. However, the overall efficiency of ammonia combustion is lower, necessitating control of unburned ammonia emissions. Compared to pure diesel, condensed particulate matter emissions from ammonia-diesel blended fuel can be reduced by over 97% at an ammonia energy substitution rate of 70%.更多还原