燃空当量比对甲醇发动机燃烧及非法规排放的影响

孙景震; 姚实聪; 宫宝利; 彭幼华; 崔连波; 彭乐高; 宫长明

doi:10.3969/j.issn.1001-2222.2018.05.008

车用发动机 >

2018 , Vol. 0 >Issue 5: 43 - 48

DOI: https://doi.org/10.3969/j.issn.1001-2222.2018.05.008

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燃空当量比对甲醇发动机燃烧及非法规排放的影响

孙景震 ,
姚实聪 ,
宫宝利 ,
彭幼华 ,
崔连波 ,
彭乐高 ,
宫长明

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

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

SUN Jingzhen ,
YAO Shicong ,
GONG Baoli ,
PENG Youhua ,
CUI Lianbo ,
PENG Legao ,
GONG Changming

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(1.Chongqing Changan New Energy Automobile Co.,Ltd.,Chongqing 401122,China;
3.State Key Laboratory of Automotive Simulation and Control,Jilin university,Changchun 130025,China;
4.Dongfeng Nissan Technical Center,Guangzhou 510640,China; 5.College of Mechanical and Electronic Engineering,Dalian Minzu University,Dalian 116600,China)

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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。

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

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孙景震 , 姚实聪 , 宫宝利 , 彭幼华 , 崔连波 , 彭乐高 , 宫长明 . 燃空当量比对甲醇发动机燃烧及非法规排放的影响[J]. 车用发动机, 2018 , 0(5) : 43 -48 . DOI: 10.3969/j.issn.1001-2222.2018.05.008

Abstract

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.

Key words： in-cylinder direct injection; methanol engine; fuel-air equivalence ratio; combustion process; non-legislation emission

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