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Experimental study on diffusive solid combustion behavior during transition from normal- to reduced-gravity
Hu LH; Delichatsios MA; Li J; Zhang XL; Wang SF(王双峰); Huo R; Hu, LH; Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China.
Source PublicationINTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
2012-03-01
Volume55Issue:7-8Pages:2035-2043
ISSN0017-9310
AbstractExperiments are carried out in a simplified drop system, which can provide a 2.3 s 10(-2) g reduced gravity period, to investigate the transition of solid material combustion behavior from normal- to reduced-gravity. A CCD camera records the diffusion flames produced by a solid fuel, Methenamine (C6H12N4), which easily sublimes and decomposes to flammable CH4 and H-2. The temperature distribution within the flame is analyzed by a monochromatic line of sight CCD measurement calibrated by a thermocouple measurement. It is revealed that during the transition period from normal- to reduced-gravity, the change of the flame shape, from tall and thin (pear like) to spherical, is faster than that of the luminance which represents the radiation intensity, indicating a relatively shorter adjustment time scale of dynamical gas flow buoyancy than that of the heat transfer when subjected to such a sudden change of gravity condition. It is also found that owing to the change of the flow affecting the oxygen and heat supply, the luminance of the flame as well as the burning rate, which was deduced based on projected area of the solid fuel according to d(2)-law, first decreases followed by an increment near the end of the drop where the gravity level slightly increases. The flame temperature gradually decreases, as the flame suddenly goes into reduced-gravity. Interpretation based on analysis of heat transfer balance and pyrolysis rate as well as the experimental results both indicate that the transitional effect is less pronounced for a smaller fuel particle than for a larger one, where buoyancy is stronger under normal-gravity whereas the flame has a larger standoff distance with increasing importance of the radiation losses from the fuel particle surface under reduced-gravity. The present work is relevant in assessing fire hazards of solid material during space travel as gravity levels change.
KeywordReduced-gravity Combustion Of Solid Particles Transition From Normal To Reduced Gravity Luminance Droplet Combustion Microgravity Experiments Flame Extinction
Subject Area微重力流体力学
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000300967600024
Funding OrganizationThis work is supported by Natural Science Foundation of China (NSFC) under Grant No. 51176180, Fundamental Research Funds for the Central Universities, Program for New Century Excellent Talents in University under Grant No. NCET-09-0914 and Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences. Prof. Michael Delichatsios was supported to be involved into this work by Chinese Academy of Science Visiting Professorship for Senior International Scientists under Grant No. 2009Z2-30.
DepartmentNML微重力两相流与燃烧
Classification一类
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/46559
Collection国家微重力实验室
Corresponding AuthorHu, LH; Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China.
Recommended Citation
GB/T 7714
Hu LH,Delichatsios MA,Li J,et al. Experimental study on diffusive solid combustion behavior during transition from normal- to reduced-gravity[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2012,55(7-8):2035-2043
APA Hu LH.,Delichatsios MA.,Li J.,Zhang XL.,王双峰.,...&Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China..(2012).Experimental study on diffusive solid combustion behavior during transition from normal- to reduced-gravity.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,55(7-8),2035-2043.
MLA Hu LH,et al."Experimental study on diffusive solid combustion behavior during transition from normal- to reduced-gravity".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 55.7-8(2012):2035-2043.
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