Space-Based Microgravity Experiments on Flame Spread over Randomly Distributed n-Decane-Droplet Clouds: Overall Flame-Spread Characteristics
Space-Based Microgravity Experiments on Flame Spread over Randomly Distributed n-Decane-Droplet Clouds: Overall Flame-Spread Characteristics
复制标题
DOI：
10.1007/s12217-018-9637-2
复制
发表时间：
2018-06
影响因子：
1.8
通讯作者：
M. Mikami;Y. Yoshida;Takehiko Seo;Tetsuya Sakashita;M. Kikuchi;Takuma Suzuki;Masaki Nokura
中科院分区：
文献类型：
--
作者：
M. Mikami;Y. Yoshida;Takehiko Seo;Tetsuya Sakashita;M. Kikuchi;Takuma Suzuki;Masaki Nokura
这项研究在国际空间站的日本实验舱“Kibo”上对火焰在随机分布的正癸烷液滴云上的传播进行了微重力实验。 67-152 个液滴分布在 30 × 30 方形晶格与放置在燃烧室中的 14 微米 SiC 纤维的交叉点上。晶格底部的一滴液滴被热丝点火器点燃，开始火焰蔓延。通过数码相机观察燃烧行为。本文首次报道了通过火焰传播随机分布的液滴云的群燃烧激发及其对液滴云平均液滴间距的依赖性。结果表明，存在群燃烧激发极限平均液滴间距。火焰传播行为受到群燃烧激发极限附近初始条件的显着影响，在该极限条件下，液滴云的燃烧寿命达到最大值，并发生诸如大规模点火之类的有趣现象。群燃烧激发极限平均液滴间距大于线性液滴阵列的火焰传播极限液滴间距。液滴云的总体火焰传播速率等于或略大于线性液滴阵列的火焰传播速率。
This research conducted microgravity experiments on the flame spread over randomly distributedn-decane-droplet clouds aboard the Japanese Experiment Module “Kibo” on the International Space Station. 67-152 droplets were distributed at intersections of a 30 × 30 square lattice with 14-micron SiC fibers placed in a combustion chamber. One droplet on the bottom side of lattice was ignited by a hot-wire igniter to start the flame spread. The burning behavior was observed by a digital camera. This paper is the first to report the group-combustion excitation of randomly distributed droplet clouds through flame spread and its dependence on the mean droplet spacing of the droplet cloud. The results show that there exists the group-combustion-excitation-limit mean droplet spacing. The flame-spread behavior is significantly affected by the initial conditions around the group-combustion-excitation limit, where the burning lifetime of the droplet cloud attains maximum and an interesting phenomenon, such as large-scale ignition, occurs. The group-combustion-excitation-limit mean droplet spacing is greater than the flame-spread-limit droplet spacing of the linear droplet array. The overall flame-spread rate of the droplet cloud is equivalent to or slightly greater than the flame-spread rate of the linear droplet array.