EGR对不同生物柴油/柴油掺混比下碳烟前驱体形成的影响  

Effect of EGR on soot precursor formation in combustion of biodiesel/diesel with different blending ratios

作　　者：吴旭东 王忠[1] 刘帅[1] 李瑞娜[1] 瞿磊 WU Xudong;WANG Zhong;LIU Shuai;LI Ruina;QU Lei(School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China;School of Automotive and Traffic Engineering, Nantong Vocational University, Nantong, Jiangsu 226007, China)

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]南通职业大学汽车与交通工程学院,江苏南通226007

出　　处：《江苏大学学报（自然科学版）》2020年第2期199-205,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51776089);江苏省高等学校自然科学研究面上项目(18KJD470005,18KJB470006);中国博士后科学基金资助项目(2019M651732)。

摘　　要：以生物柴油和柴油混合燃料为研究对象,采用AVL-Fire和Chemkin软件耦合,简化正庚烷-癸酸甲酯-9-癸烯酸甲酯燃烧反应机理作为燃烧化学反应动力学机理,构建了有3299个组分和10806个基元反应的生物柴油/柴油化学反应动力学模型,分析了EGR率和生物柴油/柴油掺混比对乙炔、苯、萘、菲和芘等碳烟前驱体生成规律的影响.结果表明:碳烟前驱体主要生成于预混燃烧阶段;随着曲轴转角的增加,碳烟前驱体生成量呈先升高后降低的趋势;随着生物柴油/柴油掺混比的增加,碳烟前驱体的初始生成时刻提前,生成量峰值和最终生成量都有所降低;随着EGR率的增加,生成量峰值时刻都有所滞后,乙炔生成量峰值降低,最终生成量逐渐升高,苯、萘、菲和芘最终生成量有所增加.Taking biodiesel/diesel as research object,by AVL-Fire software and Chemkin software,the biodiesel/diesel chemical reaction kinetics model was constructed to investigate the effects of blending ratio and EGR rate of biodiesel/diesel on the soot precursor formation of acetylene,benzene,naphthalene,phenanthrene and pyrene.The results show that the soot precursor is mainly formed in the premixed combustion stage.With the increasing of crank angle,the soot precursor content is increased with latter decreasing.With the increasing of biodiesel blending ratio,the initial formation time of soot precursor is advanced,and the peak amount of production and the final amount of production are reduced.With the increasing of EGR rate,the peak formation timing is delayed,and the production peak of acetylene is reduced with gradually increased final amount.The final amount of benzene,naphthalene,phenanthrene and pyrene is increased.

关 键 词：EGR 生物柴油 掺混比 碳烟前驱体 排放 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]