Horizontal flame spread over thin solids in reduced buoyancy environments

doi:10.1016/j.combustflame.2022.112008

	Horizontal flame spread over thin solids in reduced buoyancy environments
	Wu CJ(吴传嘉)3,4; Xiao Y ; Wang SF(王双峰)1,2,3,4; Zhu F(朱凤)4
刊名	COMBUSTION AND FLAME
	2022-06-01
卷号	240 页码:12
关键词	Flame spread Buoyancy Partial gravity Horizontal channel Thermoconvective instabilities
ISSN号	0010-2180
DOI	10.1016/j.combustflame.2022.112008
通讯作者	Wang, Shuangfeng(sfwang@imech.ac.cn)
英文摘要	A Horizontal Channel Apparatus (HCA) has been employed to investigate opposed flame spread over solid fuels in reduced buoyancy environments, which would be encountered at the diminished gravitational levels on extraterrestrial surfaces (e.g., the partial gravity on the Moon and Mars) as well. With a scaling analysis, the characteristic buoyant flow velocity in HCA is well correlated to the channel height and the Rayleigh ( Ra ) number. The experimental results show that, without forced flow, the flame spread rate and flammability in HCA can be correlated with those at different gravity levels by using Ra number, in-dicating HCA may have the ability to simulate the burning characters in partial gravity. Together with the Reynolds ( Re ) and Ra numbers, which signify the role of forced and buoyant flow, respectively, the flame spread rates and the map of flammability of the solid fuel obtained in the current HCA experiments are determined. Furthermore, four distinctively different flame spread patterns are found at various channel heights and opposed-flow velocities once the width of the cellulosic sample is extended. Likewise, the map of flame spread patterns is governed by the Re and Ra. It is further found through the examinations of the time average of the mass-loss rate that as long as Ra is below a critical value, the opposed flow in terms of Re mainly determines the oxygen transportation, while the reduced buoyancy in terms of Ra mainly contributes to the bifurcations of the potential hydro/thermal instabilities.(c) 2022 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
分类号	一类/力学重要期刊
资助项目	National Key R&D Program of China[2021YFA0716203] ; National Natural Science Foundation of China[U1738117] ; early career development program of China East Jiaotong University[10 0320 03419068]
WOS关键词	OPPOSED-FLOW ; MIXED CONVECTION ; FINGERING INSTABILITY ; FUELS ; PREDICTION ; CONCURRENT ; MECHANISMS ; NUMBER ; AIR
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering
语种	英语
WOS记录号	WOS:000777798300005
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; early career development program of China East Jiaotong University
其他责任者	Wang, Shuangfeng
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88883]
专题	力学研究所_国家微重力实验室
作者单位	1.Chinese Acad Sci, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China 2.East China Jiaotong Univ, Sch Mech Vehicle Engn, Nanchang 330013, Jiangxi, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 4.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Wu CJ,Xiao Y,Wang SF,et al. Horizontal flame spread over thin solids in reduced buoyancy environments[J]. COMBUSTION AND FLAME,2022,240:12.
APA	吴传嘉,Xiao Y,王双峰,&朱凤.(2022).Horizontal flame spread over thin solids in reduced buoyancy environments.COMBUSTION AND FLAME,240,12.
MLA	吴传嘉,et al."Horizontal flame spread over thin solids in reduced buoyancy environments".COMBUSTION AND FLAME 240(2022):12.