Flame Spread and Extinction Over a Thick Solid Fuel in Low-Velocity Opposed and Concurrent Flows

	Flame Spread and Extinction Over a Thick Solid Fuel in Low-Velocity Opposed and Concurrent Flows
	Zhu F; Lu ZB; Wang SF(王双峰)
刊名	MICROGRAVITY SCIENCE AND TECHNOLOGY
	2016
通讯作者邮箱	sfwang@imech.ac.cn
卷号	28 期号:2 页码:87-94
关键词	Gravity Liquid crystal phase transition Polydisperse suspension Concentration
ISSN号	0938-0108
通讯作者	Wang, SF (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China.
产权排序	[Zhu, Feng; Wang, Shuangfeng] Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China; [Lu, Zhanbin] Shanghai Univ, Inst Appl Math & Mech, Shanghai 200072, Peoples R China
中文摘要	Flame spread and extinction phenomena over a thick PMMA in purely opposed and concurrent flows are investigated by conducting systematical experiments in a narrow channel apparatus. The present tests focus on low-velocity flow regime and hence complement experimental data previously reported for high and moderate velocity regimes. In the flow velocity range tested, the opposed flame is found to spread much faster than the concurrent flame at a given flow velocity. The measured spread rates for opposed and concurrent flames can be correlated by corresponding theoretical models of flame spread, indicating that existing models capture the main mechanisms controlling the flame spread. In low-velocity gas flows, however, the experimental results are observed to deviate from theoretical predictions. This may be attributed to the neglect of radiative heat loss in the theoretical models, whereas radiation becomes important for low-intensity flame spread. Flammability limits using oxygen concentration and flow velocity as coordinates are presented for both opposed and concurrent flame spread configurations. It is found that concurrent spread has a wider flammable range than opposed case. Beyond the flammability boundary of opposed spread, there is an additional flammable area for concurrent spread, where the spreading flame is sustainable in concurrent mode only. The lowest oxygen concentration allowing concurrent flame spread in forced flow is estimated to be approximately 14 % O-2, substantially below that for opposed spread (18.5 % O-2).
分类号	二类
类目[WOS]	Engineering, Aerospace ; Thermodynamics ; Mechanics
研究领域[WOS]	Engineering ; Thermodynamics ; Mechanics
关键词[WOS]	Gravity ; Liquid crystal phase transition ; Polydisperse suspension ; Concentration
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.1007/s12217-015-9475-4
语种	英语
WOS记录号	WOS:000376652000002
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/59559]
专题	力学研究所_国家微重力实验室
推荐引用方式 GB/T 7714	Zhu F,Lu ZB,Wang SF. Flame Spread and Extinction Over a Thick Solid Fuel in Low-Velocity Opposed and Concurrent Flows[J]. MICROGRAVITY SCIENCE AND TECHNOLOGY,2016,28(2):87-94.
APA	Zhu F,Lu ZB,&王双峰.(2016).Flame Spread and Extinction Over a Thick Solid Fuel in Low-Velocity Opposed and Concurrent Flows.MICROGRAVITY SCIENCE AND TECHNOLOGY,28(2),87-94.
MLA	Zhu F,et al."Flame Spread and Extinction Over a Thick Solid Fuel in Low-Velocity Opposed and Concurrent Flows".MICROGRAVITY SCIENCE AND TECHNOLOGY 28.2(2016):87-94.