Hotspot auto-ignition induced detonation development: emphasis on energy density and chemical reactivity

doi:10.1080/13647830.2021.1996635

GIEC OpenIR

	Hotspot auto-ignition induced detonation development: emphasis on energy density and chemical reactivity
	Pan, Jiaying 1; Wang, Lei 1; He, Yu 1; Wei, Haiqiao 1; Shu, Gequn 1; Li, Tao2
	2021-11-12
发表期刊	COMBUSTION THEORY AND MODELLING
ISSN	1364-7830
页码	22
通讯作者	Wei, Haiqiao(whq@tju.edu.cn)
摘要	Previous work shows that auto-ignition propagation modes for strong knocking in engines are dominated by both chemical reactivity and energy density. To clarify the unique role of energy density and chemical reactivity, hotspot auto-ignition induced reaction wave propagation was investigated using direct numerical simulations, addressing the detonation regime in the detonation peninsula. Different operating conditions and mixture components were employed to design specific chemical reactivity and energy density under engine-relevant conditions. Various auto-ignition propagation modes were quantitatively investigated. The results show that unified standards for detonation development and high-accuracy excitation time are necessary for constructing a detonation peninsula. Energy density promotes detonation development and broadens the detonation regime, especially at large hotspot sizes. Meanwhile, there are positive correlations between peak pressure and energy density during detonation development, and the pressure peak can reach an amplitude beyond detonation equilibrium pressure. Furthermore, the improvement in chemical reactivity suppresses detonation development at small hotspot sizes while promoting detonation development at large hotspot sizes. But the variations in chemical reactivity caused by thermal effects show a greater significance than by fuel properties. Besides, obvious distinctions in peak pressure can be identified with the variations of reactivity gradient, and the amplitude always attains the maximum level just when detonation occurs at the edge of the hotspot. Underlying reasons are ascribed to the initial non-uniform distribution of energy density within the hotspot. Meanwhile, the reactivity progress of the remaining mixtures also affects energy density outside the hotspot.
关键词	strong knocking detonation development chemical reactivity energy density detonation peninsula
DOI	10.1080/13647830.2021.1996635
关键词[WOS]	DIRECT NUMERICAL SIMULATIONS ; REACTION FRONT PROPAGATION ; PRE-IGNITION ; TEMPERATURE-GRADIENT ; KNOCKING COMBUSTION ; AUTOIGNITION ; MIXTURES ; DEFLAGRATION ; COMPRESSION ; INITIATION
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52076149] ; National Natural Science Foundation of China[51825603]
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering ; Mathematics
项目资助者	National Natural Science Foundation of China
WOS类目	Thermodynamics ; Energy & Fuels ; Engineering, Chemical ; Mathematics, Interdisciplinary Applications
WOS记录号	WOS:000718261000001
出版者	TAYLOR & FRANCIS LTD
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/35262
专题	中国科学院广州能源研究所
通讯作者	Wei, Haiqiao
作者单位	1.Tianjin Univ, State Key Lab Engines, Tianjin, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou, Peoples R China
推荐引用方式 GB/T 7714	Pan, Jiaying,Wang, Lei,He, Yu,et al. Hotspot auto-ignition induced detonation development: emphasis on energy density and chemical reactivity[J]. COMBUSTION THEORY AND MODELLING,2021:22.
APA	Pan, Jiaying,Wang, Lei,He, Yu,Wei, Haiqiao,Shu, Gequn,&Li, Tao.(2021).Hotspot auto-ignition induced detonation development: emphasis on energy density and chemical reactivity.COMBUSTION THEORY AND MODELLING,22.
MLA	Pan, Jiaying,et al."Hotspot auto-ignition induced detonation development: emphasis on energy density and chemical reactivity".COMBUSTION THEORY AND MODELLING (2021):22.