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Opposed flame spread over a thermally-thin charring material under varied flow velocities and ambient pressures in a narrow channel apparatus

文献类型：期刊论文

作者Wang, Wenlong4,5; Tao, Shangqing4; Fang, Jun4; Zeng, Yi1; Wang, Jiyun3; Chen, Yuhang4; Zhu F(朱凤)2; Zhu, Yueqin5; Liu, Aichun5; Zhang, Yongming4
刊名FIRE SAFETY JOURNAL
出版日期2025-07-01
卷号154页码:14
关键词Narrow channel Buoyancy suppression Periodic fingering flamelets Global equivalence ratio Flammability boundary
ISSN号0379-7112
DOI10.1016/j.firesaf.2025.104396
通讯作者Tao, Shangqing(tsq2017@ustc.edu.cn)
英文摘要The opposed flame spread over thermally-thin filter paper under constrained buoyancy at varied flow velocities and ambient pressures was investigated, which will be conducive to develop ground-based techniques for simulating microgravity. With increasing flow velocity, three regimes can be roughly identified: 1) near quenching regime, the periodic fingering flamelets appear for oxygen starvation, expanding the flammability range; 2) steady-state spreading regime, symmetric flames occur among the sample surface due to buoyancy suppression, and the flame spread rate reaches its peak; 3) near blow-off regime, the flame is affected by finite chemical kinetics. The whole pyrolysis region is identified into the primary/secondary pyrolysis regions characterized by blue/orange attached flames, and the frequent transformation between them intensifies the flame instability. With increasing flow velocity, the global equivalence ratio increases firstly and decreases finally under higher pressures, while decreases monotonously under lower pressures. The optimal utilization of the narrow channel apparatus for suppressing the buoyancy effect should be located in the range of moderate flow velocities far away from the extinction limits, where the heat loss effect of the parallel plates can be neglected. By tracking the extinction limit, the flammability boundary under different pressures was obtained. It is found that the quenching boundary is dependent on the diffusion rate of fuel vapor, while the blow-off boundary is determined by the critical global equivalence ratio. The flammability range narrows with the decreasing pressure, and relatively higher ambient pressure is required to achieve better effectiveness of simulating microgravity in future space missions.
分类号二类
WOS关键词DIFFUSION FLAME ; FINGERING INSTABILITY ; PMMA SHEET ; MICROGRAVITY ; EXTINCTION ; COMBUSTION ; MECHANISMS ; IGNITION ; GRAVITY ; LIMITS
资助项目Foundation of China[52406159] ; Foundation of China[52306172] ; Foundation of China[52476136] ; Foundation of China[52304217] ; Foundation of China[52306171] ; Foundation of China[52406172] ; Natural Science Foundation of Anhui Province[2308085QE169] ; Chinese Space Station Science Experiment Project[ZDBS- ZRKJZ-TLC012] ; Science and Technology Project of State Grid Corporation of China[5200-202455115A-1-1-ZN] ; Fundamental Research Funds for the Central Universities[WK2320000070] ; Natural Science Foundation of Hebei Province[E2022209101]
WOS研究方向Engineering ; Materials Science
语种英语
WOS记录号WOS:001470896600001
资助机构Foundation of China ; Natural Science Foundation of Anhui Province ; Chinese Space Station Science Experiment Project ; Science and Technology Project of State Grid Corporation of China ; Fundamental Research Funds for the Central Universities ; Natural Science Foundation of Hebei Province
其他责任者Tao, Shangqing
源URL[http://dspace.imech.ac.cn/handle/311007/101061]  
专题力学研究所_国家微重力实验室
作者单位1.Huaqiao Univ, Coll Tourism, Quanzhou 362021, Fujian, Peoples R China;
2.Chinese Acad Sci, Key Lab Micrograv, Inst Mech, Beijing 100190, Peoples R China
3.Tianjin Fire Sci & Technol Res Inst MEM, Tianjin 300381, Peoples R China;
4.Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China;
5.Minist Emergency Management China, Natl Inst Nat Hazards, Beijing 100085, Peoples R China;
推荐引用方式
GB/T 7714		 Wang, Wenlong,Tao, Shangqing,Fang, Jun,et al. Opposed flame spread over a thermally-thin charring material under varied flow velocities and ambient pressures in a narrow channel apparatus[J]. FIRE SAFETY JOURNAL,2025,154:14.
APA Wang, Wenlong.,Tao, Shangqing.,Fang, Jun.,Zeng, Yi.,Wang, Jiyun.,...&Zhang, Yongming.(2025).Opposed flame spread over a thermally-thin charring material under varied flow velocities and ambient pressures in a narrow channel apparatus.FIRE SAFETY JOURNAL,154,14.
MLA Wang, Wenlong,et al."Opposed flame spread over a thermally-thin charring material under varied flow velocities and ambient pressures in a narrow channel apparatus".FIRE SAFETY JOURNAL 154(2025):14.

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来源：力学研究所

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