Clarification of Effect of Gravity on Flame Spreadaing over Condensed Phase and Its Extinction and Proposing of Extinguishing Method in Space

阐明重力对凝聚相火焰传播及其熄灭的影响并提出空间熄灭方法

• 批准号: 22310098
• 负责人: ITO Akihiko
• 金额: $ 10.15万
• 依托单位: Hirosaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22310098/
• 关键词: 低重力環境; 落下塔実験; 凝縮相; プール火災; パッフィング現象; グラスホフ数; 火炎高さ; 宇宙火災; 燃え拡がり; 流れの可視化; 消火; 拡散火炎; 火炎構造; 速度測定; 火災安全性; 不活性ガス; シャボン玉

To improve our understanding of the effects of gravity on flame characteristics, we conducted an experimental investigation on small-scale pool fires under different gravity levels to normal. The drop tower facility at Hirosaki University in Japan was used to obtain an arbitrary low gravity environment. For pool fire in low gravity environments, the measurements revealed that the puffing frequency and flame height declined with decreasing gravity. The flame height showed a tendency to peak at a certain level of gravity. Moreover, the normal velocity component to the flame sheet declined with decreasing gravity. To clarify the factor of puffing occurrence factor, experiments were performed using eleven different sizes of fuel pan and three different kinds of fuels. The occurrence of the puffing phenomenon, namely the puffing- limit, was summarized by the relation between the (H/D)limit and Grashof number, and found to be inversely proportional.

为了加深对重力对火焰特性影响的理解，我们对不同重力水平下的小规模池火进行了实验研究。日本弘前大学的落塔设施用于获得任意低重力环境。对于低重力环境下的池火，测量结果表明，喷出频率和火焰高度随着重力的降低而下降。火焰高度表现出在一定重力水平下达到峰值的趋势。此外，火焰片的法向速度分量随着重力的减小而减小。为了弄清喷气发生的因素，使用11种不同尺寸的油盘和3种不同的燃料进行了实验。 膨化现象的发生，即膨化极限，可以用(H/D)极限与格拉霍夫数之间的关系来概括，发现是成反比的。

项目成果

Extinguishment of a Methane Air Diffusion Flame by Using Blast Wave

利用冲击波扑灭甲烷空气扩散火焰

• 发表时间: 2013
• 作者: Hiroyuki Torikai;Shota Saito and Akihiko Ito
• 通讯作者: Shota Saito and Akihiko Ito

走性に基づく通路内での燃え拡がり火炎挙動の予測

基于趋化性的通道内火焰蔓延行为预测

• 发表时间: 2013
• 作者: Manahan Siallagan;Hiroshi Deguchi;Manabu Ichikawa;A. MURATA (他3名);小林創己，伊藤昭彦，鳥飼宏之
• 通讯作者: 小林創己，伊藤昭彦，鳥飼宏之

渦輪によって輸送された不活性ガスを充填したシャボン玉による消火

用涡流环输送的充满惰性气体的肥皂泡灭火

• 发表时间: 2013
• 作者: 三和雅史;大山達雄;渡邊康平，鳥飼宏之，伊藤昭彦
• 通讯作者: 渡邊康平，鳥飼宏之，伊藤昭彦

Flame Spread along a Thin Combustible Solid with Randomly Distributed Square Pores of Two Different Sizes

• DOI: 10.5539/mas.v6n9p11
• 发表时间: 2012-08
• 期刊: Modern Applied Science
• 作者: S. Abe;A. Ito;H. Torikai

Scale Modeling of Buoyancy-induced Instability of Pool Fires

浮力引起的水池火灾失稳的比例模型

• 发表时间: 2013
• 作者: Yuji Nakamura;Sou Okuizumi;Kaoru Wakatsuki;Hiroyujki Torikai and Akihiko Ito
• 通讯作者: Hiroyujki Torikai and Akihiko Ito