Auto-ignition and knocking characteristics of gasoline/ethanol blends in confined space with turbulence

doi:10.1016/j.fuel.2021.120559

GIEC OpenIR

	Auto-ignition and knocking characteristics of gasoline/ethanol blends in confined space with turbulence
	Pan, Jiaying 1; Hu, Zhen 1; Pan, Zhenhua 2; Shu, Gequn 1; Wei, Haiqiao 1; Li, Tao 3; Liu, Changwen 1
	2021-06-15
发表期刊	FUEL
ISSN	0016-2361
卷号	294 页码:11
通讯作者	Wei, Haiqiao(whq@tju.edu.cn) ; Liu, Changwen()
摘要	Ethanol as an attractive oxygenate is increasingly applied for blending with gasoline yielding beneficial combustion and emission performance for internal combustion (IC) engines. Due to the complex fuel chemistry and combustion processes, the auto-ignition and knocking mechanism of gasoline-ethanol blends under enginerelevant conditions are not fully understood. In this study, using a novel rapid compression machine chamber featured by forced turbulence, three gasoline-ethanol blends (i.e. E10, E20, and E30 on a volume basis) were investigated at the target pressure of 20 - 50 atm and temperature of 750 - 850 K after compression. With particle image velocimetry for turbulence calibration, auto-ignition initiation and knocking evolutions were synchronously measured using high-speed photography, infrared imaging, and instantaneous pressure acquisition. Aiming at auto-ignition timing and pressure oscillations, the role of fuel reactivity, turbulent mixing, and energy density was comparatively investigated to elucidate the dominant role in strong knocking formation. A detonation peninsula for gasoline-ethanol blends was employed to explore the ethanol blending effect on detonation development. The results show that due to the suppression of ethanol addition on low-temperature reactions, the strong knocking tendency of gasoline-ethanol blends is significantly inhibited, manifesting retarded auto-ignition timing, reduced pressure oscillations, and vanishing fast reaction wave propagation. Turbulent mixing with colder wall boundary layer alleviates knocking intensity through decreasing the thermodynamic states of in-cylinder mixtures, while energy density promotes detonation development owing to the resonance between reaction waves and pressure waves. Nonetheless, fuel reactivity still plays the first-order significance in strong knocking formation and detonation development. The current study highlights the role of key parameters in auto-ignition and knocking characteristics in high-boost/low-temperature engines, and provides useful insights into the gap between RCM platforms and actual IC engines.
关键词	Combustion visualization Auto-ignition Turbulence Fuel reactivity
DOI	10.1016/j.fuel.2021.120559
关键词[WOS]	RAPID COMPRESSION ; PRE-IGNITION ; TEMPERATURE ; COMBUSTION ; ETHANOL ; HOTSPOT
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China[2017YFE0102800] ; National Natural Science Foundation of China[52076149] ; National Natural Science Foundation of China[51825603]
WOS研究方向	Energy & Fuels ; Engineering
项目资助者	National Key R&D Program of China ; National Natural Science Foundation of China
WOS类目	Energy & Fuels ; Engineering, Chemical
WOS记录号	WOS:000640908800005
出版者	ELSEVIER SCI LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/33023
通讯作者	Wei, Haiqiao; Liu, Changwen
作者单位	1.Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China 2.Jiangsu Univ, Sch Energy Resources & Power Engn, Zhenjiang 212013, Jiangsu, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
推荐引用方式 GB/T 7714	Pan, Jiaying,Hu, Zhen,Pan, Zhenhua,et al. Auto-ignition and knocking characteristics of gasoline/ethanol blends in confined space with turbulence[J]. FUEL,2021,294:11.
APA	Pan, Jiaying.,Hu, Zhen.,Pan, Zhenhua.,Shu, Gequn.,Wei, Haiqiao.,...&Liu, Changwen.(2021).Auto-ignition and knocking characteristics of gasoline/ethanol blends in confined space with turbulence.FUEL,294,11.
MLA	Pan, Jiaying,et al."Auto-ignition and knocking characteristics of gasoline/ethanol blends in confined space with turbulence".FUEL 294(2021):11.