均质二甲醚/乙醇喷雾压燃的燃烧和排放特性  

Combustion and Emission Characteristics of Homogenous DME-Ethanol Spray Compression Ignition Combustion

作　　者：王真[1] 乔信起[1] 张德全 侯军兴[1] 张俊军[1] 黄震[1] 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240 [2]龙口龙泵燃油喷射有限公司技术中心,山东龙口265701

出　　处：《上海交通大学学报》2009年第9期1446-1450,共5页Journal of Shanghai Jiaotong University

基　　金：高校博士点基金资助项目(20050248013)

摘　　要：在改装的2-135柴油发动机上对进气道喷射二甲醚(DME)引燃直喷乙醇的燃烧特性进行研究,分析了燃料预混合率和负荷对缸内压力、放热率、压力升高率和排放等的影响.结果表明:在发动机转速1000 r/min,平均有效压力pBME=0.27、0.41 MPa的工况下,缸内燃烧过程包括DME的均质充量压燃和乙醇喷雾燃烧2部分,随着预混合率增加,DME冷焰反应后的燃烧相位不断提前,燃烧过程由2个阶段发展到4个阶段,而后变为3个阶段;与此同时,缸内压力增大,循环变动减小;排放物中NOx的体积分数随预混合率的变化趋势与负荷有关,在pBME≤0.33 MPa时,NOx的体积分数随预混合率的降低而减小,但pBME=0.41 MPa时,情况则正好相反.The combustion and emission characteristics of ethanol direct injection combustion triggered by dimethyl ether （DME） port injection in a modified 2-135 diesel engine were investigated, and the impacts of load and premixed fuel ratio rp on in-cylinder pressure, heat release rate, pressure rise rate, emissions and cycle-to-cycle variation were evaluated. The results show that the combustion process comprises the DME homogeneous charge compression ignition combustion and ethanol spray combustion, and it displays different characteristics with rp. With the increase of rp, in-cylinder pressure rises, and the combustion process changes from two stages to four stages and then to three stages, but cycle-to-cycle variation decreases. The engine NOx emissions depend on the load and rp. When BMEP≤0.33 MPa, NOx emissions decrease with the decrease of rp, but when BMEP=0. 41 MPa, the trend is the opposite.

关 键 词：二甲醚 乙醇 均质压燃 双燃料 燃烧特性 

分 类 号：TK46[动力工程及工程热物理—动力机械及工程]