| 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); Wang, SF (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China.
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| 发表期刊 | MICROGRAVITY SCIENCE AND TECHNOLOGY
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| 2016
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| 卷号 | 28期号:2页码:87-94 |
| ISSN | 0938-0108
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| 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). |
| 关键词 | Gravity
Liquid Crystal Phase Transition
Polydisperse Suspension
Concentration
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| DOI | 10.1007/s12217-015-9475-4
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| URL | 查看原文
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000376652000002
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| 关键词[WOS] | Gravity
; Liquid crystal phase transition
; Polydisperse suspension
; Concentration
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| WOS研究方向 | Engineering
; Thermodynamics
; Mechanics
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| WOS类目 | Engineering, Aerospace
; Thermodynamics
; Mechanics
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| 项目资助者 | This work is funded by the Strategic Pioneer Program on Space Science, Chinese Academy of Sciences, under grant No. XDA04020410. The authors thank Mr. Suide Wang for his assistance in conducting the experiments.
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| 课题组名称 | NML微重力两相流与燃烧
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| 论文分区 | 二类
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| 力学所作者排名 | True
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/59559
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| 专题 | 微重力重点实验室
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| 通讯作者 | Wang, SF (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China. |
推荐引用方式
GB/T 7714 |
Zhu F,Lu ZB,Wang SF,et al. 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.
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| APA |
Zhu F,Lu ZB,王双峰,&Wang, SF .(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.
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| 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.
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