气候变化领域集成服务门户(CCPortal): Combined effects of excess air ratio and EGR rate on combustion and emissions behaviors of a GDI engine with CO2 as simulated EGR (CO2) at low load

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DOI	10.1016/j.fuel.2021.120442
	Combined effects of excess air ratio and EGR rate on combustion and emissions behaviors of a GDI engine with CO2 as simulated EGR (CO2) at low load
	Gong C.; Si X.; Liu F.
发表日期	2021
ISSN	162361
卷号	293
英文摘要	Exhaust gas recirculation (EGR) is one of the most measure to decrease NOX emissions in the cylinder. CO2 was introduced to intake charge as a simulated EGR (CO2), the combined effects of excess air ratio and EGR rate on combustion and emissions behaviors of a gasoline direct injection (GDI) engine with simulated EGR (CO2) at low load were analyzed and compared to assess the difference between actual EGR and simulated EGR (CO2). The results show that EGR slows combustion, and simulated EGR (CO2) deterioration combustion is weaker than actual EGR. The peak cylinder pressure, heat release rate and cylinder temperature of simulated EGR (CO2) all increase and their phases all advance compare to actual EGR under the same EGR rate and excess air ratio. Combustion center and combustion duration for simulated EGR (CO2) delay slowly with EGR rate at any excess air ratios. Simulated EGR (CO2) can significantly improve the COVimep of the engine. For actual EGR rate > 10% and excess air ratio of 1.2, the COVimep sharply increases. Simulated EGR (CO2) has a little effect on CO emission at lean-burn condition, and on HC emission at stoichiometric condition. The NOX and soot emissions decrease significantly with EGR rate under different forms of EGR and excess air ratios. At a fixed EGR rate, the soot emissions of simulated EGR (CO2) is higher than that of actual under any excess air ratios. Added 10–15% CO2 to intake charge, CO2 as simulated EGR (CO2) can be well applied in GDI engine. © 2021 Elsevier Ltd
英文关键词	Actual EGR; EGR rate; Excess air ratio; Gasoline direct injection (GDI) engine; Performance; Simulated EGR (CO2)
scopus关键词	Air intakes; Combustion; Deterioration; Direct injection; Exhaust gas recirculation; Gas emissions; Soot; Combustion duration; Cylinder temperatures; Excess air ratios; Exhaust gas recirculation (EGR); Gasoline direct injection engines; Heat Release Rate (HRR); Lean-burn conditions; Peak cylinder pressures; Carbon dioxide
来源期刊	Fuel
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177182
作者单位	College of Mechanical and Electronic Engineering, Dalian Minzu University, Dalian, 116600, China; Toyota Motor Technical Center (China) Co., Ltd., Tianjin, 300384, China
推荐引用方式 GB/T 7714	Gong C.,Si X.,Liu F.. Combined effects of excess air ratio and EGR rate on combustion and emissions behaviors of a GDI engine with CO2 as simulated EGR (CO2) at low load[J],2021,293.
APA	Gong C.,Si X.,&Liu F..(2021).Combined effects of excess air ratio and EGR rate on combustion and emissions behaviors of a GDI engine with CO2 as simulated EGR (CO2) at low load.Fuel,293.
MLA	Gong C.,et al."Combined effects of excess air ratio and EGR rate on combustion and emissions behaviors of a GDI engine with CO2 as simulated EGR (CO2) at low load".Fuel 293(2021).