Effects of initial temperature on autoignition and detonation   development in dimethyl ether/air mixtures with temperature gradient

doi:10.1016/j.proci.2016.08.014

CORC > 北京大学 > 工学院

	Effects of initial temperature on autoignition and detonation development in dimethyl ether/air mixtures with temperature gradient
	Dai, Peng ; Qi, Chengken ; Chen, Zheng
刊名	PROCEEDINGS OF THE COMBUSTION INSTITUTE
	2017
关键词	Autoignition Detonation Temperature gradient Dimethyl ether PROPAGATING SPHERICAL FLAMES REACTION FRONT PROPAGATION SPARK-IGNITION ENGINE N-HEPTANE/AIR MIXTURE HIGH-PRESSURE PRE-IGNITION HOT-SPOTS MODEL INHOMOGENEITIES DEFLAGRATION
DOI	10.1016/j.proci.2016.08.014
英文摘要	For large hydrocarbon fuels used in internal combustion engines, different low-temperature and high-temperature chemistries are involved in the autoignition processes under different initial temperatures. As one of the simplest fuels with low-temperature chemistry, dimethyl ether (DME) is considered in this study and one-dimensional autoignitive reaction front propagation induced by temperature gradient is simulated for stoichiometric DME/air mixtures considering detailed chemistry and transport. The emphasis is placed on assessing and interpreting the influence of initial temperature on the detonation development regime. Different initial temperatures below, within and above the negative-temperature coefficient (NTC) region are considered. For each initial temperature, four typical autoignition modes are identified: supersonic autoignitive reaction front (without detonation); detonation development; transonic reaction front; and sub-sonic reaction front. The detonation development regimes for two fuels, DME and n-heptane, at the same initial temperature and those for the same fuel, DME, at three different initial temperatures respectively be-low, within and above the NTC region are obtained. Based on these results, the influence of fuel type and initial temperature on detonation development regime are discussed. It is found that the detonation development regime becomes narrower at higher initial temperature. Moreover, the influence of initial temperature on reaction front propagation speed is investigated. The reaction front propagation speed is shown to be strongly affected by different chemistries involved in low and high temperature regions. When only the high-temperature chemistry is involved, the reaction front propagation speed is shown to be less dependent on the initial temperature. (C) 2016 by The Combustion Institute. Published by Elsevier Inc.; National Natural Science Foundation of China [51322602, 51606091]; China Postdoctoral Science Foundation [2015M570011]; SCI(E); ARTICLE; 3; 3643-3650; 36
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/476406]
专题	工学院
推荐引用方式 GB/T 7714	Dai, Peng,Qi, Chengken,Chen, Zheng. Effects of initial temperature on autoignition and detonation development in dimethyl ether/air mixtures with temperature gradient[J]. PROCEEDINGS OF THE COMBUSTION INSTITUTE,2017.
APA	Dai, Peng,Qi, Chengken,&Chen, Zheng.(2017).Effects of initial temperature on autoignition and detonation development in dimethyl ether/air mixtures with temperature gradient.PROCEEDINGS OF THE COMBUSTION INSTITUTE.
MLA	Dai, Peng,et al."Effects of initial temperature on autoignition and detonation development in dimethyl ether/air mixtures with temperature gradient".PROCEEDINGS OF THE COMBUSTION INSTITUTE (2017).