CAJ | 학술논문

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)的油束与柴油相比较,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,NO_x降低30%～50%.
개전료직분식시유궤연용이갑미/시유혼합연료시연료호용성、분무특성급발동궤동력성、경제성화배방연구.결과표명:혼합연료적포화증기압저우순이갑미적포화증기압,유조우소제연유계통적기조;D20(함20%이갑미)적유속여시유상비교,관천도축단,분무추각증대,유리우연유여공기적충분혼합;시유궤연용이갑미/시유혼합연료시,통과괄당조정순배연료량,동력성초과원궤,최저당량유모솔하강료4.5%,연도하강70%이상,NO_x강저30%～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 NO_x emissions can decrease by 30%～50%.