掺混乙醇对菜籽油/柴油混合燃料燃烧及排放特性的影响  

Effects of Ethanol on Combustion and Emission Characteristics of Rapeseed Oil/Diesel Blend

作　　者：张丹 沈言锦 刘国 ZHANG Dan;SHEN Yanjin;LIU Guo(Hunan Automotive Engineering Vocational College,Zhuzhou,Hunan,412001,China)

机构地区：[1]湖南汽车工程职业学院,湖南株洲412001

出　　处：《小型内燃机与车辆技术》2023年第6期44-49,共6页Small Internal Combustion Engine and Vehicle Technique

基　　金：湖南省教育厅科学研究项目(20C0999);湖南汽车工程职业学院科学研究课题(HQZYKYA01)。

摘　　要：为改善发动机燃用高比例生物质混合燃料的性能,在中等比例的菜籽油/柴油混合物(VD50)中分别添加10%、20%和30%体积比的乙醇,在助溶剂的作用下制备了菜籽油/柴油/乙醇混合燃料(VD50E10、VD50E20和VD50E30),并对其主要性能进行测试。在1 800 r/min不同负荷条件下,研究乙醇掺混比对中等比例菜籽油/柴油混合燃料燃烧和排放特性的影响,并将其与柴油进行对比。结果表明,在低负荷时,随着乙醇掺混比的增加,混合燃料的燃烧开始时间延迟,缸内峰值压力和瞬时放热率峰值逐渐减小,其中VD50E30最小;在高负荷时,混合燃料的瞬时放热率峰值增加,VD50E30的缸内峰值压力略高于其他试验燃料,柴油的缸内峰值压力最小。随着乙醇体积分数的增加,混合燃料CO和HC的排放量增加,而碳烟和NOx的排放量减小。在某些负荷工况下,VD50E30的碳烟排放量甚至低于柴油。In order to improve the performance of engine burning high proportion biomass mixed fuel,10%,20%and 30%ethanol by volume were added to the medium proportion of rapeseed oil/diesel blends.Rapeseed oil/diese/ethanol blends(VD50E10,VD50E20 and VD50E30)were made under the action of cosolvent,and its main performance was tested.Under different loads of 1800 r/min,the effects of ethanol blending ratio on the combustion and emission characteristics of medium proportion rapeseed oil/diesel blends were studied and compared with diesel fuel.The results show that,with the increase of ethanol volume fraction in the blends,the combustion start time of blends were delayed at low load,and the peak values of in cylinder peak pressure and instantaneous heat release rate gradually decreased,which of VD50E30 is the smallest.At high load,the peak value of instantaneous heat release rate of blends increased,the peak pressure in cylinder of VD50E30 was slightly higher than that of other fuels,and the peak pressure in cylinder of diesel was the smallest.With the increase of ethanol volume fraction in the blends,the CO and HC emissions of blends increased,and the soot and NOx emissions decreased.Under some operating conditions,the soot emission of VD50E30 was lower than that of diesel.

关 键 词：菜籽油/柴油混合燃料 乙醇 燃烧 排放 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程] TK6