汽油/加氢催化生物柴油混合燃油简化机理的构建及验证  

Construction and verification of reduced mechanism of gasoline/hydrogenated catalytic biodiesel blends

作　　者：钟汶君[1] 赖思成 袁起飞 王文俊 徐若桉 何志霞[1,2] 王谦 ZHONG Wenjun;LAI Sicheng;YUAN Qifei;WANG Wenjun;XU Ruoan;HE Zhixia;WANG Qian(School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Institute for Energy Research,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013 [2]江苏大学能源研究院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2023年第5期588-598,共11页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52076103,51706088)。

摘　　要：针对汽油/加氢催化生物柴油(HCB)混合燃油可改善汽油直喷压燃模式中低负荷着火困难和燃烧不稳定的现象,基于燃油分子结构和理化特性相似原则,提出了正十六烷作为加氢催化生物柴油的表征燃料.采用多种简化方法对正十六烷详细机理(POLIMI_1412)进行简化,并与汽油表征燃料骨架机理以及氮氧化物子机理进行耦合,获得了82个组分和370步基元反应的汽油/HCB混合燃油简化机理.采用反应路径分析和敏感性分析方法,对部分反应的反应速率常数进行优化.结果表明:对着火延迟期的敏感性分析发现,各反应的敏感性随温度和当量比变化显著;低温工况下,大多数低温反应对着火起控制作用,而对于层流火焰速度,主要是小分子反应起控制作用;通过对简化机理的着火延迟期、层流火焰速度和组分摩尔分数进行对比验证,以及对简化机理在压燃发动机仿真中的适用情况进行验证,发现简化后获得机理可以很好预测汽油/HCB混合燃油着火燃烧特性.Gasoline/hydrogenated catalytic biodiesel(HCB)blends can alleviate the problems of low-load ignition difficulty and combustion instability in gasoline direct compression ignition combustion mode.Based on the principle of similarity of fuel composition and physicochemical properties,n-hexadecane was proposed as the surrogate fuel for HCB.Several methods were utilized to reduce the detailed mechanism of n-hexadecane(POLIMI_1412)and couple with the gasoline surrogate skeletal mechanism and nitrogen oxide sub-mechanism,and the final reduced mechanism containing 82 species and 370 reactions was obtained.Reaction pathway analysis and sensitivity analysis were carried out to optimize the reaction kinetic constants of several reactions.The results show that the sensitivity of each reaction for ignition delay time is varied significantly with temperature and equivalence ratio.Under low temperature conditions,most low-temperature reactions control the ignition,while for laminar flame velocity,small molecule reactions mainly play controlling role.By verifying ignition delay period,laminar flame velocity,component concentration and compression ignition engine,it is found that the simplified mechanism can well predict the autoignition and combustion characteristics of gasoline/hydrogenated catalytic biodiesel blends.

关 键 词：汽油 加氢催化生物柴油 正十六烷 化学反应动力学 着火延迟期 

分 类 号：TK16[动力工程及工程热物理—热能工程]