Microgravity combustion of polyethylene droplet in drop tower
文献类型：期刊论文
| 作者 | Sun PY; Wu CJ(吴传嘉) ; Zhu F(朱凤); Wang SF(王双峰); Huang XY
|
| 刊名 | Combustion and Flame
 |
| 出版日期 | 2020 |
| 卷号 | 222页码:18-26 |
| 关键词 | Droplet combustion Burning-rate constant Spacecraft fire safety Thermoplastic droplet Comet flame |
| ISSN号 | 0010-2180 |
| DOI | 10.1016/J.COMBUSTFLAME.2020.08.032 |
| 英文摘要 | Microgravity experiments of polyethylene (PE) droplet combustion were conducted by a 3.6-s drop tower with the gravity level of 10−3~10−4 g to investigate the burning behaviors and fire hazards of molten thermoplastics in the spacecraft. Pre-ignited droplets with a diameter of about 3 mm were continually generated and detached from burning PE tubes. Once the drop capsule started free-fall, droplets entered the microgravity environment with an initial velocity of 10–35 cm/s (Stage I). A comet-shape flame with an intense bubbling and ejecting process of the moving droplet was observed, and the burning-rate constant (K) was found around 2.6 ± 0.3 mm2/s. After the droplet landed on the floor, it could rebound with a near-zero velocity, showing as a spherical flame (Stage II). The combustion of PE droplet followed the classical d-square law with K = 1.3 ± 0.1 mm2/s. The measured large burning-rate constant (or the volume shrinkage rate) of the moving droplet was caused by the robust bubbling process, which reduced the bulk density of molten PE and ejected unburnt fuel (about 25% of total mass loss). However, the actual mass burning rate of the PE droplet should be smaller than most hydrocarbon liquids because of a smaller mass-transfer number (B ≈ 2). The flame burning rate of PE droplet is 4 ± 1 g/m2-s per unit flame-sheet area that may be used to estimate the fuel mass-loss rate and fire heat release rate in microgravity. This novel microgravity combustion experiment on the thermoplastic droplet could expand the physical understanding of fire risk and hazard of plastic material in the spacecraft environment. |
| 分类号 | 一类/力学重要期刊 |
| 语种 | 英语 |
| WOS记录号 | WOS:000590677400003 |
| 其他责任者 | Wang, Shuangfeng ; Huang, Xinyan |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/85685]  |
| 专题 | 力学研究所_国家微重力实验室 |
| 推荐引用方式 GB/T 7714 | Sun PY,Wu CJ,Zhu F,et al. Microgravity combustion of polyethylene droplet in drop tower[J]. Combustion and Flame,2020,222:18-26. |
| APA | Sun PY,吴传嘉,朱凤,王双峰,&Huang XY.(2020).Microgravity combustion of polyethylene droplet in drop tower.Combustion and Flame,222,18-26. |
| MLA | Sun PY,et al."Microgravity combustion of polyethylene droplet in drop tower".Combustion and Flame 222(2020):18-26. |
入库方式： OAI收割
来源：力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。