二甲醚发动机采用PCCI-DI燃烧方式的研究  

Study on PCCI-DI Combustion in a DME Engine

作　　者：汪映[1] 郭振祥[1] 何利[1] 李维[1] 周龙保[1] 

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《内燃机学报》2008年第4期319-324,共6页Transactions of Csice

基　　金：国家自然科学基金项目(50706038);教育部高等学校博士学科点新教师基金(20070698030)

摘　　要：开展了DME PCCI-DI发动机燃烧和排放特性的试验研究,并与DME HCCI发动机的性能进行了对比。结果表明:DME PCCI-DI发动机的输出功率在一定程度仍然受到均质浓混合气燃烧爆震的限制,但发动机的功率输出较DME HCCI发动机有较大的提高。HCCI发动机的NOx的排放能维持在非常低的水平,但其HC和CO排放远高于DME PCCI-DI发动机,且其只能在很窄的范围内工作。由于DME PCCI-DI发动机具有一定的预混燃烧量,从而使扩散燃烧速率加快,是一种具有最高爆发压力较小、压力升高率较低以及低燃烧噪声的一种燃烧模式。在目前HCCI发动机没有完全成熟的条件下,PCCI-DI模式是兼顾HCCI燃烧优点,拓宽HCCI发动机运转范围的较为合理的一种燃烧模式。Experimental investigation on combustion and emission of DME PCCI-DI engine was carried out. The comparisons between the PCCI-DI and the HCCI combustion were also made. Results show that although, in some extend, the power output of DME PCCI-DI engine is limited by knocking, the range of power output is extended significantly in comparison to DME HCCI engine. NOx emission of HCCI engine maintains the very low value, while CO and HC emissions are higher than those of PCCI-DI engine. In addition, the operating range for HCCI is narrower than PCCI-DI engine. The rate of diffusion combustion increases due to the premixed combustion for PCCI-DI operation. PCCI-DI combustion has the lower values in the peak pressure, the rate of pressure rise and the noise. At the present stage of HCCI technology, the PCCI-DI combustion mode is regarded as an alternative approach by using the partial merits of HCCI engine and extending the operation range of HCCI engine.

关 键 词：PCCI-DI HCCI 二甲醚 燃烧 排放 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]