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
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。
SUN Nannan1(), WANG Xiaoyan1, WANG Dan2, JIA Demin1
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。
中图分类号:
孙楠楠, 王晓艳, 王丹, 贾德民. 基于仿真的不同添加成分对HCCI天然气发动机性能影响[J]. 汽车安全与节能学报, 2022, 13(2): 386-396.
SUN Nannan, WANG Xiaoyan, WANG Dan, JIA Demin. Effect of different additives on performance of natural gas HCCI engine based on simulation[J]. Journal of Automotive Safety and Energy, 2022, 13(2): 386-396.
理化特性 | 天然气 | H2 | O3 | DME |
---|---|---|---|---|
沸点 / ℃ | - 162 | - 253 | - 111.9 | - 24.9 |
自燃温度 / ℃ | 650 | 585 | - | 235 |
辛烷值 | 130 | - | - | - |
十六烷值 | - | 低 | - | > 55 |
化学计量空燃比 | 16.4 | 34.3 | - | 8.9 |
低热值 / (MJ·kg-1) | 50 | 120 | - | 27.6 |
蒸发热 / (kJ·kg-1) | - | - | 316.5 | 410 |
空气中体积比浓着火极限 / % | 13.9 | 74.2 | - | 18.0 |
空气中体积比稀着火极限 / % | 5.0 | 4.2~ | - | 3.4 |
理化特性 | 天然气 | H2 | O3 | DME |
---|---|---|---|---|
沸点 / ℃ | - 162 | - 253 | - 111.9 | - 24.9 |
自燃温度 / ℃ | 650 | 585 | - | 235 |
辛烷值 | 130 | - | - | - |
十六烷值 | - | 低 | - | > 55 |
化学计量空燃比 | 16.4 | 34.3 | - | 8.9 |
低热值 / (MJ·kg-1) | 50 | 120 | - | 27.6 |
蒸发热 / (kJ·kg-1) | - | - | 316.5 | 410 |
空气中体积比浓着火极限 / % | 13.9 | 74.2 | - | 18.0 |
空气中体积比稀着火极限 / % | 5.0 | 4.2~ | - | 3.4 |
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