燃空当量比对甲醇发动机燃烧及非法规排放的影响  

Combustion and Non-Legislation Emission of Methanol Engine under Different Fuel-Air Equivalence Ratios

作　　者：孙景震 姚实聪 宫宝利[3] 彭幼华 崔连波[3] 彭乐高 宫长明 SUN Jingzhen;YAO Shicong;GONG Baoli;PENG Youhua;CUI Lianbo;PENG Legao;GONG Changming(Chongqing Chang an New Energy Automobile Co.,Ltd.,Chongqing 401120,China;China Automotive Engineering Research Institute Co.,Ltd.,Chongqing 401122,China;State Key Laboratory of Automotive Simulation and Control,Jilin university,Changchun 130025,China;Dongfeng Nissan Technical Center,Guangzhou 510640,China;College of Mechanical and Electronic Engineering,Dalian Minzu University,Dalian 116600,China)

机构地区：[1]重庆长安新能源汽车有限公司,重庆401120 [2]吉林大学汽车仿真与控制国家重点实验室,吉林长春130025 [3]中国汽车工程研究院股份有限公司,重庆401122 [4]东风日产技术中心,广东广州510640 [5]大连民族大学机电工程学院,辽宁大连116600

出　　处：《车用发动机》2018年第5期43-48,共6页Vehicle Engine

基　　金：国家自然科学基金资助项目(51676029,51176063);中央高校基本科研业务费专项资金资助项目(DC201502010203,DCPY2016090)

摘　　要：基于一款经柴油机改装的缸内直喷点燃式甲醇发动机,使用三维流体动力学模拟软件AVL-Fire耦合甲醇氧化反应机理,研究了不同燃空当量比对缸内混合气浓度分布、燃烧特性及未燃甲醇和甲醛排放的影响。结果表明:当燃空当量比增加时,缸内最高燃烧温度、最高燃烧压力及放热率峰值均显著升高,甲醛和未燃甲醇排放均得到改善;当燃空当量比从0.33增加到0.67时,最高燃烧压力、燃烧温度和放热率峰值分别增加65%,72%及51%;燃空比超过0.4时,未燃甲醇及甲醛排放急剧减小,且主要集中在气缸壁附近。The influences of different fuel-air equivalence ratios on in-cylinder mixture concentration distribution,combustion characteristics,formaldehyde and unburned methanol were studied on a diesel engine retrofitted in-cylinder injection spark ignition methanol engine by coupling methanol chemical kinetics reaction mechanism with 3D CFD software AVL-Fire.The research results show that the increase of fuel-air equivalence ratio can increase maximum in-cylinder temperature,maximum in-cylinder pressure and maximum heat release rate significantly and reduce the emission of formaldehyde and unburned methanol obviously.When the fuel-air equivalent ratio increases from 0.33 to 0.67,the maximum combustion pressure,maximum combustion temperature and heat release rate peak increases by 65%,72%and 51%respectively.When the fuel-air ratio exceeds 0.4,the emission of unburned methanol and formaldehyde decrease sharply and mainly lie near the cylinder wall.

关 键 词：缸内直喷 甲醇发动机 燃空当量比 燃烧过程 非法规排放 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]