含水乙醇-生物柴油对186F柴油机燃烧与排放的影响研究  

Effect of Ethanol Containing Water/Biodiesel on Combustion and Emission of 186F Diesel Engine

作　　者：朱佳隆 刘理凡 李瑞娜[1] 刘帅[1] 王忠[1] ZHU Jialong;LIU Lifan;LI Ruina;LIU Shuai;WANG Zhong(School of Automobile and Traffic Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《车用发动机》2020年第2期77-83,共7页Vehicle Engine

基　　金：国家自然科学基金(51776089);江苏高等学校自然科学基金(18KJB470006,17KJD470004);国家博士后基金(2019M651732);汽车测控与安全四川省重点实验室开放课题资助(QCCK2019-004)。

摘　　要：乙醇燃料吸水性较强,生物柴油制备过程中残存水分,含有水分的燃料对柴油机的燃烧与排放会产生一定的影响。建立了186F柴油机燃用含水乙醇-生物柴油的燃烧与排放模型,通过实测186F柴油机示功图进行了验证,对不同含水率的乙醇-生物柴油的燃烧和排放特性进行了仿真,分析了乙醇含水率对柴油机燃烧特征参数和NO_x与soot排放的影响规律。从柴油机动力、经济和排放的角度,提出了乙醇含水率阈值的概念。结果表明:乙醇含水率为0%~20%时,随着乙醇含水率的增加,缸内最大燃烧压力、缸内平均温度、平均指示压力等均呈下降趋势;燃用乙醇-生物柴油混合燃料的柴油机指示比能耗有所增加;NOx与soot排放质量分数降低幅度呈增大趋势,不影响柴油机性能的乙醇含水率阈值应低于10%。The ethanol fuel has strong water absorption and the residual water will keep in biodiesel fuel during the preparation. The residual water in the mixed fuel of ethanol and biodiesel will have a certain effect on the combustion process and the emission of diesel engine. The model of combustion and emission process of 186 F diesel engine was established and verified by the measured indicator diagram and the simulation was then conducted for ethanol and biodiesel blended fuel under different water contents. The influencing law of water content on combustion characteristic parameters of diesel engine and NO_x and soot emissions was analyzed with the model. The threshold of absorbed water in the mixed fuel of ethanol and biodiesel was proposed based on diesel engine power, economy and emission performance. The results show that the maximum pressure, mean temperature and indicated pressure inside cylinder decrease with the increase of water content within the range of 0%-20%. The indicated specific energy consumption of diesel engine fueled with mixed fuel also increases. The reduction of NOx and soot mass fraction increases. The threshold of absorbed water in the mixed fuel of ethanol and biodiesel should be less than 10%, or the performance of diesel engine will be affected.

关 键 词：柴油机 乙醇-生物柴油 含水率 燃烧 排放 

分 类 号：TK421.7[动力工程及工程热物理—动力机械及工程]