中文摘要：

在压缩比为18.5的HCCI发动机上进行二甲醚（DME）流量分别为2.6和3.5 L/min,不同混氢比例混合燃料的燃烧及排放试验。试验结果表明,在试验工况下,混氢HCCI燃烧可以提高缸压峰值、DME高温氧化放热峰值和制动平均有效压力,当DME流量为3.5 L/min时,混氢使缸压峰值提高26.4%;DME混氢燃烧可以降低CO和HC的排放量,其中CO排放量可以减少到DME HCCI原机燃烧时的20%-30%,但NOx排放量较纯DMEHCCI燃烧有所增加。

英文摘要：

DME and hydrogen were blended with air in intake and the HCCI combustion was realized.The speed of engine was hold at 1400r/min and the mass flow rate of DME was ranged at 2.6 and 3.5L/min.With the hydrogen fraction increasing,the excessive air coefficient λ was reduced until the engine knocked.The result showed that DME blended with hydrogen could increase the peak pressure,heat release rate and BMEP.The peak pressure was improved 26.4% when the DME flow was 3.5L/min.In the emissions,CO and HC could be reduced,and CO emission was only 20%-30% of the original data after hydrogen enriched.However,NOx emissions increased with the addition of hydrogen.