摘要
为了研究加氢生物柴油-乙醇-柴油三元燃料的燃烧和排放性能,配制加氢生物柴油-柴油二元燃料(PHC10、PHC20、PHC30)和加氢生物柴油-乙醇-柴油三元燃料(PHC5E5、PHC10E10、PHC15E15),选取1 800r/min时25%、50%、75%和100%负荷工况作为测试工况,在高压共轨四缸柴油机上对各混合燃料进行燃烧试验研究。试验结果表明:在100%负荷工况下,与柴油相比,二元燃料、三元燃料的着火时刻分别提前、滞后,这是加氢生物柴油和乙醇的不同十六烷值影响的结果;二元燃料的着火时刻提前,着火延迟期内形成的可燃混合气数量较少,而且加氢生物柴油的低热值较低、运动黏度较高,在主燃烧阶段内的最大缸压和放热率峰值均低于柴油;对于三元燃料,初期燃烧放热可以有效降低乙醇的汽化潜热带来的不利影响,而且乙醇挥发性能较好和氧含量较高,使得三元燃料在主燃烧阶段内的最大缸压和放热率峰值均大于柴油。三元燃料的HC和CO排放均高于二元燃料,二者的差异随着负荷的增大而减小;混合燃料的NOx排放受负荷影响较大,在25%和50%负荷工况下,三元燃料的NOx排放低于二元燃料,而在75%和100%负荷工况下呈现相反的趋势;三元燃料的碳烟排放低于二元燃料。该研究可为加氢生物柴油-乙醇-柴油三元燃料在发动机上的应用提供基础数据。
Hydrogenated biodiesel-diesel binary blends(PHC10,PHC20,PHC30)and hydrogen-ated biodiesel-ethanol-diesel ternary blends(PHC5E5,PHC10E10,PHC15E15)were prepared to conduct the combustion and emissions research on a common rail diesel engine under the conditions of 25%,50%,75%and 100%loads at 1800 r/min.It was revealed that the ignition timings of the binary blends and ternary blends were advanced and lagged respectively under 100%load,due to different cetane numbers of hydrogenated biodiesel and ethanol.Owing to the less combustible mixture in the ignition delay affected by the advance of ignition timing of binary blends,the smaller lower-heating value,and the higher kinematic viscosity of hydrogenated biodiesel,the maximum cylinder pressure and heat release rate of the binary blends in the main combustion term were lower than those of diesel.The heat released from the initial combustion term could overcome the disadvantage of latent heat of vaporization of ethanol.Meanwhile,the good volatilization performance and higher oxygen content of ethanol could result in higher maximums of cylinder pressure and heat release rate for the ternary blends in the main combustion term compared with diesel.HC and CO emissions of the ternary blends were higher than those of the binary blends,and the differences decreased with the increase of load.NO x emissions of the fuel blends were prone to be influenced by load.At 25%and 50%loads,NO x emissions of the ternary blends were lower than those of the binary blends,opposite to the trend of NO x emissions at 75%and 100%loads.The ternary blends exhibited lower smoke emissions than the binary blends.This study may provide useful data for the application of hydrogenated biodiesel-ethanol-diesel ternary blend in engines.
作者
左磊
梅德清
张登攀
代圣超
王军锋
ZUO Lei;MEI Deqing;ZHANG Dengpan;DAI Shengchao;WANG Junfeng(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2020年第9期189-196,共8页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51761145011,51876133)。
