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汽车安全与节能学报 ›› 2022, Vol. 13 ›› Issue (2): 386-396.DOI: 10.3969/j.issn.1674-8484.2022.02.020

• 汽车节能与环保 • 上一篇    下一篇

基于仿真的不同添加成分对HCCI天然气发动机性能影响

孙楠楠1(), 王晓艳1, 王丹2, 贾德民1   

  1. 1.潍柴动力股份有限公司 内燃机可靠性国家重点实验室,潍坊 261061,中国
    2.吉林大学 汽车仿真与控制国家重点实验室,长春 130022,中国
  • 收稿日期:2021-11-15 修回日期:2022-02-24 出版日期:2022-06-30 发布日期:2022-07-01
  • 作者简介:孙楠楠 (1985—),女(汉),山东,高级工程师。E-mail: sunnann@weichai.com

Effect of different additives on performance of natural gas HCCI engine based on simulation

SUN Nannan1(), WANG Xiaoyan1, WANG Dan2, JIA Demin1   

  1. 1. State Key Laboratory of Engine Reliability,Weichai Power Co.Ltd., Weifang 261061, China
    2. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
  • Received:2021-11-15 Revised:2022-02-24 Online:2022-06-30 Published:2022-07-01

摘要:

该文针对天然气混合均质压燃(HCCI)发动机存在的低负荷易失火问题,基于一台改装的单缸机搭建了相应的三维模型,从缸内燃烧特性和助燃机理两方面对比分析了氢气(H2)、臭氧(O3)和二甲醚(DME) 3种气态添加成分对天然气HCCI发动机性能的影响。结果表明,3种添加成分均能改变天然气空气混合气的自燃燃烧特性,增强着火能力,提前燃烧相位,均可实现天然气HCCI向低负荷范围扩展;自由基OH是强化天然气HCCI燃烧的重要组分,H2和O3的助燃机理在于增加自由基OH浓度,加快甲烷消耗反应速率,DME的助燃机理在于引燃天然气;H2是一种扩展天然气HCCI发动机低负荷运行边界的优良添加成分。

关键词: 混合均质压燃(HCCI)发动机, 添加成分, 天然气, 氢气, 臭氧, 二甲醚(DME)

Abstract:

Aiming at the misfire problem of natural gas mixed homogeneous compression ignition (HCCI) engine at low load, a three-dimensional model of the modified single cylinder engine was built to study the effect of hydrogen (H2), ozone (O3) and dimethyl ether (DME) as the additives on combustion characteristics and combustion-supporting mechanism. The results show that the three additive components can change the autoignition characteristics of natural gas-air mixture, enhance the ignition ability, and advance the combustion phase, all of which can realize the expansion of natural gas HCCI to the low load range. Radical OH is an important component to enhance the combustion of natural gas HCCI. The combustion-supporting mechanism of H2 and O3 is to increase the concentration of free-radical OH and accelerate the reaction rate of methane consumption, while combustion-supporting mechanism of DME is to ignite natural gas. H2 is an excellent additive to extend the low load operation boundary of natural gas HCCI engine.

Key words: homogeneous charge compression ignition (HCCI) engine, additive, natural gas, hydrogen, ozone, dimethyl ether (DME)

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