被动预燃室燃烧策略对汽油机缸内燃烧及排放特性的影响研究

doi:10.19562/j.chinasae.qcgc.2024.09.011

Abstract

Abstract:

As global emission regulations and energy-saving policies become increasingly stringent， gasoline engines are facing significant challenges. The urgent technical challenge is to achieve high efficiency and ultra-low emission of gasoline engines. The pre-chamber turbulent jet ignition is one of the most promising technologies for improving the thermal efficiency of gasoline engines and reducing pollutant emission. In this paper， the influence of lean combustion limit expansion and ignition timing on the optimization of thermal efficiency is investigated systematically through three-dimensional flow simulation analysis coupled with a detailed chemical reaction mechanism. The results show that the passive pre-chamber can effectively expand the lean combustion limit， improve the thermal efficiency and reduce the pollutant emission of the engine in comparison with the spark ignition. At an excess air factor of 1.5， the maximum indicated thermal efficiency is 47.24%， which is 11.89% higher than that of the original engine， with the NO _x and Soot reduced by 29.27% and 98.76%， respectively.

Key words: gasoline engine, passive pre-chamber, combustion strategy, in-cylinder combustion, emission characteristics

Lü Yang,Shangsi Feng,Jing Luo,Lan Li,Zhe Kang. Study on the Influence of Passive Pre-chamber Combustion Strategy on In-cylinder Combustion and Emission Characteristics of Gasoline Engines[J].Automotive Engineering, 2024, 46(9): 1633-1642.

Figures/Tables 21

名称	模型
湍流模型	RNG k- $ε$ 两方程模型
燃烧模型	SAGE详细化学动力学模型
喷雾破碎模型	RT-KH破碎模型
碰撞模型	NTC模型
蒸发模型	Frossling模型
碳烟模型	Hiroyasu经验模型
氮氧化物模型	Extended Zeldovich模型

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参数	数值
缸径×行程/mm	75×93.13
连杆长度/mm	142
排量/L	1.6
压缩比	11.2
燃料供给方式	进气道喷射
进气方式	自然吸气
转速/（r·min^-1）	2 000
负荷/%	100

参数	数值
燃料	汽油（#92）
点火正时/（°CA）	-10、-8、-6、-4、4.8（原机）
过量空气系数	1.0（原机）、1.0-1.6（被动预燃室）
负荷/%	100
点火方式	火花点火（原机）、被动预燃室

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Study on the Influence of Passive Pre-chamber Combustion Strategy on In-cylinder Combustion and Emission Characteristics of Gasoline Engines

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