タイトル | Analysis of Local Flame-Spread Characteristics of an Unevenly Arranged Droplet Cloud in Microgravity |
DOI | info:doi/10.15011//jasma.35.350203 |
著者(日) | 吉田, 泰子; 佐野, 成太; 瀬尾, 健彦; 三上, 真人; 森上, 修; 菅, 勇志; 菊池, 政雄 |
著者(英) | Yoshida, Yasuko; Sano, Narita; Seo, Takehiko; Mikami, Masato; Moriue, Osamu; Kan, Yuji; Kikuchi, Masao |
著者所属(日) | 山口大学; 山口大学; 山口大学; 山口大学; 九州大学; 宇宙航空研究開発機構(JAXA); 宇宙航空研究開発機構(JAXA) |
著者所属(英) | Yamaguchi University; Yamaguchi University; Yamaguchi University; Yamaguchi University; Kyushu University; Japan Aerospace Exploration Agency (JAXA); Japan Aerospace Exploration Agency (JAXA) |
発行日 | 2018-04-30 |
発行機関など | Japan Society of Microgravity Application (JASMA) 日本マイクログラビティ応用学会(JASMA) |
刊行物名 | International Journal of Microgravity Science and Application (IJMSA) |
巻 | 35 |
号 | 2 |
開始ページ | 350203-1 |
終了ページ | 350203-6 |
刊行年月日 | 2018-04-30 |
言語 | eng |
抄録 | As a preliminary experiment of the ''Group Combustion'' experiment conducted in the Japanese Experiment Module ''Kibo'' aboard the International Space Station (ISS) in 2017, a combustion experiment of an unevenly arranged droplet cloud with 148 n-decane droplets tethered on a SiC-fiber lattice was conducted in microgravity during parabolic flight of an aircraft. In this study, three methods of identifying the local flame-spread direction were proposed to determine the local flame-spread rate between two adjacent droplets of an unevenly arranged droplet cloud considering the local flame-spread direction. The first method employed the vertical direction from the isothermal line to the unburned droplet. The isothermal line was approximated based on the luminance of SiC fibers tethering droplets. The second method considered the luminance distribution of the initial flame immediately after ignition. The third method compared the local flame-spread-rate candidates from neighboring droplets with the flame spread-rate of the linear droplet array. It was possible to identify the local flame-spread direction by any one of these methods, and the local flame-spread rate is calculated between two droplets close to this direction. The results suggest that there are many conditions under which the local flame-spread rate of an unevenly arranged droplet cloud is greater than the flame spread rate of the linear droplet array. |
内容記述 | Physical characteristics: Original contains color illustrations 形態: カラー図版あり Accepted: 2018-04-12 |
キーワード | Microgravity; Combustion experiment; Droplet cloud; Flame spread |
資料種別 | Journal Article |
NASA分類 | Space Processing |
ISSN | 0915-3616 |
ISSN(online) | 2188-9783 |
NCID | AN10537663 |
SHI-NO | AA1840175000 |
URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/925742 |