Methane-oxygen detonation characteristics near their propagation limits   in ducts

doi:10.1016/j.fuel.2016.02.089

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	Methane-oxygen detonation characteristics near their propagation limits in ducts
	Zhang, Bo ; Shen, Xiaobo ; Pang, Lei ; Gao, Yuan
刊名	FUEL
	2016
关键词	Detonation limits Methane-oxygen Velocity deficit Cellular structure VELOCITY DEFICITS GAS EXPLOSION GASEOUS DETONATIONS CONNECTED VESSELS ANNULAR CHANNELS WALLED TUBES AIR MIXTURES WAVES BEHAVIOR PARAMETERS
DOI	10.1016/j.fuel.2016.02.089
英文摘要	In this study, the near-limit behavior of gaseous detonations in three methane-oxygen mixtures (CH4-2O(2), CH4-1.5O(2) and CH4-4O(2)) is investigated experimentally. A 36-mm diameter circular tube and three annular channel gaps (w = 2 mm, 4.5 mm and 7 mm) were used to look at the effect of different geometries on the detonation limits phenomenon. Photodiodes and smoked foils were employed to measure the time-of-arrival of the detonation wave and record the cellular detonation structure, respectively. As the detonation propagates within the limits, the velocity is steady with only a few percent deficit. By decreasing the initial pressure and, hence, reducing the sensitivity of the mixture, the detonation velocity deficit increases gradually. When the initial pressure is approaching the detonation limits, no steady detonation velocity can be realized, and failure occurs. With decreasing initial pressure, the smoked foil records indicate clearly that the cellular detonation evolves from a multi-headed to double-headed and eventually to a single-head spin as the limits approaches. The single-headed spinning detonations for CH4-2O(2), CH4-1.5O(2) and CH4-4O(2) mixtures in the 36-mm round tube occurs from p(0) = 3-7 kPa, 4-10 kPa and 7-16 kPa, respectively. Using different annular channel widths, it is observed that the detonation velocity decreases as the channel gap is reduced. (C) 2016 Elsevier Ltd. All rights reserved.; National Natural Science Foundation of China - China [11402092]; project of State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology - China [KFJJ15-03M]; SCI(E); EI; ARTICLE; bzhang@ecust.edu.cn; 1-7; 177
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/437083]
专题	工学院
推荐引用方式 GB/T 7714	Zhang, Bo,Shen, Xiaobo,Pang, Lei,et al. Methane-oxygen detonation characteristics near their propagation limits in ducts[J]. FUEL,2016.
APA	Zhang, Bo,Shen, Xiaobo,Pang, Lei,&Gao, Yuan.(2016).Methane-oxygen detonation characteristics near their propagation limits in ducts.FUEL.
MLA	Zhang, Bo,et al."Methane-oxygen detonation characteristics near their propagation limits in ducts".FUEL (2016).