NH3-PODE3双燃料发动机HCII燃烧特性的光学诊断

doi:10.3969/j.issn.1674-8484.2022.03.012

汽车安全与节能学报 ›› 2022, Vol. 13 ›› Issue (3): 509-516.DOI: 10.3969/j.issn.1674-8484.2022.03.012

NH₃-PODE₃双燃料发动机HCII燃烧特性的光学诊断

毛建树(), 马骁(), 马跃, 王志, 张翼霄, 帅石金

清华大学,汽车安全与节能国家重点实验室,北京 100084,中国

收稿日期:2022-07-04 修回日期:2022-08-01 出版日期:2022-09-30 发布日期:2022-10-04
通讯作者: 马骁
作者简介:* 马骁(1983—),男(汉),北京,副教授。E-mail: max@tsinghua.edu.cn。
毛建树(1997—),男(汉),重庆,博士研究生。E-mail: mjs20@mails.tsinghua.edu.cn。
基金资助:
国家自然科学基金项目(51976100);汽车安全与节能国家重点试验室基金项目(ZZ2021-034)

Optical diagnostic on HCII combustion characteristics for NH₃-PODE₃ dual fuel engine

MAO Jianshu(), MA Xiao(), MA Yue, WANG Zhi, ZHANG Yixiao, SHUAI Shijin

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

Received:2022-07-04 Revised:2022-08-01 Online:2022-09-30 Published:2022-10-04
Contact: MA Xiao

摘要/Abstract

摘要：

氨和聚甲氧基二甲醚（PODE_n）是内燃机实现双碳目标的重要替代燃料,而双燃料燃烧模式是一种公认较有潜力的氨燃烧技术路线。该文围绕PODE_n引燃NH₃的双燃料燃烧模式,基于光学发动机和高速摄影系统,研究了NH₃-PODE3方案均质混合气引燃（HCII）模式中不同PODE₃喷射时刻及不同氨能量占比对缸内燃烧图像及燃烧特性的影响。结果表明：PODE₃具有良好的引燃特性;随着PODE₃喷射时刻从曲轴转角(CA) -20°延迟到 -5°,火焰图像面积、火焰亮度和放热率峰值均增加,缸内压力峰值先增加后降低;直喷（DI）喷射时刻为CA-10°时,随着氨能量占比增加,CA10和CA50的相位逐渐滞后,但压力与放热率峰值均先增加后降低,说明存在最佳的氨-PODE₃能量比。

关键词: 内燃机, 双燃料, 氨（NH₃）, 聚甲氧基二甲醚（PODE_n）, 均质混合气引燃(HCII), 光学诊断

Abstract:

Ammonia and PODE_n are important alternative fuels for internal combustion engines to achieve the dual carbon target, and the dual fuel combustion mode is a generally recognized potential technology route for ammonia combustion. Focusing on the dual fuel combustion mode of ammonia ignited by PODE_n, the effects of different PODE₃ injection times, the different ammonia energy fractions on the in-cylinder combustion images, and the combustion characteristics in the ammonia-PODE₃ homogeneous charge induced ignition (HCII) mode were systematically investigated based on an optical engine and the high-speed photography system. The results showed that PODE₃ has good ignition characteristics; with the PODE₃ injection time being delayed from crank angle (CA) - 20° to - 5°, the flame image area, the flame brightness and the peak heat release rate are increasing while the peak in-cylinder pressure increases first and then decreases; At a fixed direct injection (DI) time of CA -10°, the phase of CA10 and CA50 are gradually retarded with the ammonia energy fractions increasing, while both of the peak pressure and the peak heat release rate in the cylinder increase first and then decrease, indicating that there is an optimal ammonia-PODE₃ energy ratio.

Key words: internal combustion engines, dual fuel, ammonia, polyoxymethylene dimethyl ethers(PODE_n), homogeneous charge induced ignition (HCII), optical diagnostic

中图分类号:

TK448.21

毛建树, 马骁, 马跃, 王志, 张翼霄, 帅石金. NH₃-PODE₃双燃料发动机HCII燃烧特性的光学诊断[J]. 汽车安全与节能学报, 2022, 13(3): 509-516.

MAO Jianshu, MA Xiao, MA Yue, WANG Zhi, ZHANG Yixiao, SHUAI Shijin. Optical diagnostic on HCII combustion characteristics for NH₃-PODE₃ dual fuel engine[J]. Journal of Automotive Safety and Energy, 2022, 13(3): 509-516.

图/表 10

图1 光学发动机试验系统

缸径	83.1 mm
行程	105 mm
连杆长度	210 mm
压缩比	15.8
活塞形式	平顶
可视区域直径	58 mm
发动机转速	1 200 r/min
进气早开角CA	24°
进气晚关角CA	50°
排气早开角CA	86°
排气晚关角CA	16°

表1 光学发动机相关参数

m (PODE₃) mg	m (NH₃) mg	α (PODE₃) (°)	A %	φ
6.3	0	-20, -15, -10, -5	0	0.054
6.3	4.9	-10	77	0.098
6.3	9.9	-20, -15, -10, -5	154	0.142
6.3	14.8	-10	231	0.188
6.3	19.8	-10	308	0.235

表2 试验条件具体参数

图2 缸压曲线和光学机燃烧图像

（α(PODE3) CA（ATDC） = -10 °）

图3 不同PODE3喷射时刻下的光学机燃烧过程图像

图4 不同氨能量占比下的光学机燃烧过程图像

（（α （PODE3） CA（ATDC） = -10 °）

图5 缸压曲线和放热率曲线

图6 不同PODE3喷射时刻及不同氨能量占比下的IMEP试验结果

图7 不同PODE3喷射时刻与不同NH3能量占比下的CA50试验结果

图8 着火落后期与燃烧持续期试验结果

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NH₃-PODE₃双燃料发动机HCII燃烧特性的光学诊断

Optical diagnostic on HCII combustion characteristics for NH₃-PODE₃ dual fuel engine

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