Abstract: Experimental investigation on the combustion characteristics of PCCI-DI combustion by the partial pilot DME from the intake pipe is carried out.Results indicate that the engine has lower peak cylinder pressure and lesser rise rate of pressure.PCCI-DI DME engine also shows an obvious two-stage heat-release characteristic.Compared with HCCI DME engine, the peak values of two heat-release stages are reduced: the position of the first peak has almost no change and the position of the second peak shifts to the position near after TDC.

Key words: partial premixed charge compression ignition (PCCI), direct injection, dimethyl ether(DME), combustion characteristics

摘要： 在单缸二甲醚发动机上开展了DME部分预混压燃与缸内直喷混合燃烧(PCCI-DI)特性的研究。结果表明: DMEPCCI-DI发动机具有较低的最高爆发压力和压力升高率。PCCI-DIDME发动机燃烧过程也表现出明显的两 阶段放热特点,和HCCIDME发动机相比,两个放热峰值有所下降,第1个放热峰值位置基本不变,第2个放热峰 值后移到上止点略后位置。

关键词: PCCI, 直喷, 二甲醚, 燃烧特性