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

doi:10.3969/j.issn.1674-8484.2022.03.012

Abstract

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

CLC Number:

TK448.21

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.

Figures/Tables 10

References 16

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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°

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°

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

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

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

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