点火时刻对甲醇发动机燃烧及非法规排放的影响

宫长明1; 宫宝利2; 彭乐高3; 孙景震2; 李朝晖4; 屈翔4; 刘凤华1

doi:10.3969/j.issn.1001-2222.2017.06.005

车用发动机 >

2017 , Vol. 0 >Issue 6: 25 - 29

DOI: https://doi.org/10.3969/j.issn.1001-2222.2017.06.005

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点火时刻对甲醇发动机燃烧及非法规排放的影响

宫长明1 ,
宫宝利2 ,
彭乐高3 ,
孙景震2 ,
李朝晖4 ,
屈翔4 ,
刘凤华1

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（1.大连民族大学机电工程学院，辽宁大连 116600；2.中国汽车工程研究院股份有限公司，重庆 401122；3.德尔福（上海）动力推进系统有限公司，上海 200131；4.吉林大学汽车仿真与控制国家重点实验室，吉林长春 130022）

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Effects of Ignition Timing on Combustion and Noncompulsory Emission of Methanol Engine

GONG Changming1 ,
GONG Baoli2 ,
PENG Legao3 ,
SUN Jingzhen2 ,
LI Zhaohui4 ,
QU Xiang4 ,
LIU Fenghua1

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(1.School of Electromechanical Engineering，Dalian Nationalities University,Dalian 116600,China；
2.China Automotive Engineering Research Institute Company Limited,Chongqing 401122,China；
3.Delphi Shanghai Dynamics & Propulsion Systems Co.,Ltd.,Shanghai 200131,China;
4.State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China)

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摘要

针对甲醇发动机低温冷起动困难，在1台由1130单缸柴油机改造而成的直喷火花点火甲醇发动机上，利用CFD模拟软件AVLFire耦合甲醇氧化反应机理，通过电热塞将进气温度加热到283 K，研究了点火时刻对甲醇发动机低温（266 K）冷起动燃烧及非法规排放的影响。结果表明：提前点火时刻能够使缸内混合气得到较充分燃烧，减少未燃甲醇排放，当点火时刻由8°BTDC提前到11°BTDC时未燃甲醇排放显著减少；提前点火时刻能够降低甲醛排放，当点火时刻提前到17°BTDC、缸内最高燃烧温度超过1 300 K时，甲醛快速氧化，甲醛排放显著减少。

关键词： 冷起动; 直喷甲醇发动机; 非法规排放; 燃烧; 点火时刻

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宫长明1 , 宫宝利2 , 彭乐高3 , 孙景震2 , 李朝晖4 , 屈翔4 , 刘凤华1 . 点火时刻对甲醇发动机燃烧及非法规排放的影响[J]. 车用发动机, 2017 , 0(6) : 25 -29 . DOI: 10.3969/j.issn.1001-2222.2017.06.005

Abstract

For the cold start problem of methanol engine, one 1130 singlecylinder diesel engine was retrofitted to direct injection spark ignition methanol engine and the influences of ignition timing on methanol combustion and noncompulsory emission during cold start at 266 K were researched by simulating the oxidation reaction mechanism of methanol with AVLFire software and preheating the intake to 283 K with the electric heater plug. The simulation results show that advancing the ignition timing can improve the combustion and reduce the unburned methanol emission. When the ignition timing advances from 8°CA BTDC to 11°CA BTDC, the unburned methanol emission decreases remarkably. Moreover, formaldehyde oxidizes rapidly and its emission decreases obviously when the ignition timing is 17°CA BTDC and the incylinder peak temperature is beyond 1 300 K.

Key words： cold start; direct injection methanol engine; noncompulsory emission; combustion; ignition timing

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