缸内直喷射流点火汽油机的燃烧优化

doi:10.19562/j.chinasae.qcgc.2021.11.008

Abstract

Abstract:

Jet ignition technology is an effective way to achieve lean burn and improve thermal efficiency of the engine. In this paper， a jet igniter is installed on a multi-cylinder gasoline engine to carry out jet ignition combustion optimization through different injection strategies. Firstly， the minimum fuel consumption operation point is determined within the high efficiency range of the original engine working with conventional spark ignition. Then， based on the selected working condition， the effect of single and dual injection strategies on fuel consumption of jet ignition is studied， and key parameters of dual injection strategy are optimized. Finally， the combustion and emission characteristics of different injection strategies and ignition methods are further compared. The results show that compared with spark ignition the fuel consumption of the engine is reduced by jet ignition， especially when combined with dual injection strategy during the intake stroke， with the minimum fuel consumption rate of the engine reduced by 4 g·（kW·h）^-1. The emission of CO and THC of jet ignition is basically the same as that of spark ignition， but NO_x emission is higher. Compared with single injection strategy， using dual injection strategy can result in lower NO_x emission.

Key words: jet ignition, dual injection strategy, direction injection, gasoline engine

Ziqing Zhao,Yunliang Qi,Ning Tian,Yi Zhang,Cong Liu,Yi Yao,Zhi Wang. Combustion Optimization for Jet Ignition Direct Injection Gasoline Engine[J].Automotive Engineering, 2021, 43(11): 1631-1637.

Figures/Tables 16

References 20

1	HTTPS：//iea.blob.core.windows.net/assets/3f901e93-c083-4649-a9e6-c591e28a7b70/ETP2015.pdf.
2	IKEYA K， TAKAZAWA M， YAMADA T， et al. Thermal efficiency enhancement of a gasoline engine ［J］. SAE International Journal of Engines， 2015， 8（4）：1579-1586.
3	ITABASHI S， MURASE E， TANAKA H， et al. New combustion and powertrain control technologies for fun-to-drive dynamic performance and better fuel economy ［C］. SAE Paper 2017-01-0589.
4	JUN D， LEE B， SON J， et al. Development of gasoline direct injection engine for improving brake thermal efficiency over 44% ［J］. Journal of Engineering for Gas Turbines and Power， 2020， 142（10）：101005.
5	TOULSON E， SCHOCK H， ATTARD W. A review of pre-chamber initiated jet ignition combustion systems ［C］. SAE Paper 2010-01-2263.
6	王博远，齐运亮，王颖迪，等.预燃室射流点火装置的设计与性能研究［J］.汽车工程，2018，40（1）：7-13.
	WANG B， QI Y， WANG Y， et al. An investigation into the design and performance of pre-combustion chamber jet igniter ［J］. Automotive Engineering， 2018， 40（1）： 567-573.
7	GENTZ G， THELEN B， GHOLAMISHEERI M， et al. A study of the influence of orifice diameter on a turbulent jet ignition system through combustion visualization and performance characterization in a rapid compression machine ［J］. Applied Thermal Engineering， 2015， 81： 399-411.
8	TIAN J， CUI Z， REN Z， et al. Experimental study on jet ignition and combustion processes of natural gas ［J］. Fuel， 2020， 262： 116467.
9	LI F， ZHAO Z， WANG Z， et al. Experimental and numerical study of a methane-fueled pre-chamber system in rapid compression machine ［J］. Combustion Science and Technology， 2019： 1-32.
10	BISWAS S， TANVIR S， WANG H， et al. On ignition mechanisms of premixed CH4/air and H2/air using a hot turbulent jet generated by pre-chamber combustion ［J］. Applied Thermal Engineering， 2016， 106： 925–937.
11	PETERS N， KRISHNA S， BUNCE M， et al. Optimization of lambda across the engine map for the purpose of maximizing thermal efficiency of a jet ignition engine［C］. SAE Paper 2020-01-0278.
12	COOPER A， HARRINGTON A， BASSETT M， et al. Application of the passive mahle jet ignition system and synergies with miller cycle and exhaust gas recirculation［C］. SAE Paper 2020-01-0283.
13	SHAH A， TUNESTAL P， JOHANSSON B. Scalability aspects of pre-chamber ignition in heavy duty natural gas engines ［C］. SAE Paper 2016-01-0796.
14	NORITAKA K， HIROKI K， NAOHIRO I. Study of gasoline pre-chamber combustion at lean operation ［C］. Ignition Systems for Gasoline Engines， 2018： 261-274.
15	HUA J， ZHOU L， GAO Q， et al. Influence of pre-chamber structure and injection parameters on engine performance and combustion characteristics in a turbulent jet ignition （TJI） engine ［J］. Fuel， 2021， 283.
16	冷先银，葛琪琪，何志霞，等.预燃室式天然气掺氢发动机燃烧及排放模拟［J］.内燃机学报，2021，39（1）：26-33.
	LENG X Y， GE Q Q， HE Z X， et al. Numerical study on the combustion and emission characteristics of a prechamber engine fueled with hydrogen enriched compressed natural gas ［J］. Transactions of CSICE， 2021， 39（1）： 26-33.
17	赵自庆，王志，李富柏，等.气相射流点火天然气发动机的燃烧及排放特性［J］.汽车安全与节能学报， 2020， 11（1）： 117-126.
	ZHAO Z Q， WANG Z， LI F B， et al. Characteristics of combustion and emission of natural gas engine using gas-jet ignition ［J］. Journal of Automotive Safety and Energy， 2020， 11（1）： 117-126.
18	ZHAO Z， WANG Z， QI Y， et al. Experimental study of combustion strategy for jet ignition on a natural gas engine ［J］. International Journal of Engine Research， 2020. https ：//doi.org/10.1177/14680874 20977751.
19	LI F， ZHAO Z， WANG B， et al. Experimental study of pre-chamber jet ignition in a rapid compression machine and single-cylinder natural gas engine［J］. International Journal of Engine Research， 2021， 22（4）： 1342–1356.
20	徐雅齐，王志，王建昕，等.增压直喷汽油机超级爆震的不同抑制方法［J］.内燃机学报，2014，32（1）：26-31.
	XU Y Q， WANG Z， WANG J X， et al. Suppression strategies for super-knock of turbo-charged GDI engines ［J］. Transactions of CSICE， 2014， 32（1）： 26-31.

参数	数值
单缸排量/L	0.37
冲程/mm	89
缸径/mm	73
连杆长度/mm	141.4
压缩比	13
射流室体积/mL	0.635
射流室孔数	6
射流锥角/（°）	100

参数	数值
转速/ （r·min^-1）	2 000、 3 000、 3 500
负荷/ MPa	1.2、 0.8
过量空气系数	1.4
喷油压力/ MPa	35
喷射策略	单次 / 双次
第1次喷射时刻/ （°）CA ATDC	-290 ~ -360
第2次喷射时刻/ （°）CA ATDC	-190 ~ -240
喷射比例	1∶1、 2∶1、 3∶1、 4∶1

[1]	Xiaona Li,Fangxi Xie,Huili Dou,Jiangwei Liu,Yu Liu. Influence of Valve Overlap Angle on GDI Engine Performance and Particulate Emission [J]. Automotive Engineering, 2023, 45(4): 654-662.
[2]	Fangxi Xie,Xianglong Meng,Yu Liu,Xiaona Li,Yulin Zhang,Haizhou Feng. EVCT on Combustion and Particulate Emission of Direct Injection Gasoline Engine [J]. Automotive Engineering, 2022, 44(5): 701-708.
[3]	Wei Wang,Ziqing Zhao,Kaiyuan Cai,Yi Liu,Shang Liu,Wei Liu,Zhi Wang. Combustion Control Strategy of Active Jet Ignition of Natural Gas Engine [J]. Automotive Engineering, 2022, 44(12): 1919-1925.
[4]	Sun Ping, Liu Ze, Liu Shaozhen, Yu Xiumin, Cao Zhi, Yang Song. Effect of Injection Ratio on Combustion and Emission ofCombined Injection Gasoline Engine During Warm-up Process [J]. Automotive Engineering, 2020, 42(6): 718-724.
[5]	Gao Ying, Xie Tianchi, Men Xin, Xu Yingjian & Fei Xiaoheng. A Study on the Effect of Stroke-to-Bore Ratio on Gasoline Engine's Flow Field [J]. , 2018, 40(9): 1014-1020.

Combustion Optimization for Jet Ignition Direct Injection Gasoline Engine

RichHTML

PDF (PC)

Like

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 16

References 20

Related Articles 5

Metrics

Comments

Recommended 10