柴油机燃用二甲醚/柴油混合燃料时的特性研究  

Research on Operation Characteristics of Compression Ignition Engine Fueled with Dimethyl-Ether/Diesel Blend

作　　者：李跟宝[1] 周龙保[2] 

机构地区：[1]长安大学汽车学院,西安710064 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《内燃机工程》2010年第1期13-16,共4页Chinese Internal Combustion Engine Engineering

摘　　要：开展了直喷式柴油机燃用二甲醚／柴油混合燃料时燃料互溶性、喷雾特性及发动机动力性、经济性和排放研究。结果表明：混合燃料的饱和蒸气压低于纯二甲醚的饱和蒸气压，有助于消除燃油系统的气阻；D20（含20％二甲醚）的油柬与柴油相比较，贯穿度缩短，喷雾锥角增大，有利于燃油与空气的充分混合；柴油机燃用二甲醚／柴油混合燃料时，通过适当调整循环燃料量，动力性超过原机，最低当量油耗率下降了4．5％，烟度下降70％以上，NOx降低309／6～50％。An investigation was carried out to determine the miscible properties of DME with diesel and the spray characteristics of D20 blend. The engine performances, such as power output, fuel economy, and emission characteristic, were studied when the engine was fueled with D20 blend. Experimental result shows that the vapor pressure of DME blends is lower than that of pure DME at certain temperatures, which helps eliminating the vapor lock in the engine fuel supply system. Under the same ambient pressure, D20 blend exhibits shorter spray penetration and larger spray angle in comparison to pure diesel fuel, which is beneficial to the mixing of injected fuel with surrounding air. In addition, engine test result also indicates that the engine performance of DME blend engine is better than that of original diesel engine, the power output can increase, the lowest specific fuel consumption can reduce by 4.5 %, soot emissions can decrease by more than 70 %, and NOx emissions can decrease by 30 %-50 %.

关 键 词：内燃机 二甲醚 喷雾 排放 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]