Opposed-flow Flame Spread Over Solid Fuels in Microgravity: the Effect of Confined Spaces

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• 作者：Shuangfeng Wang ; Jun Hu ; Yuan Xiao ; Tan Ren…
• 关键词：Flame spread ; Solid fuel ; Confined space ; Microgravity
• 刊名：Microgravity Science and Technology
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：27
• 期：5
• 页码：329-336
• 全文大小：5,361 KB
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• 作者单位：Shuangfeng Wang (1)
  Jun Hu (2)
  Yuan Xiao (1)
  Tan Ren (2)
  Feng Zhu (1)
  
  1. Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
  2. School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China
  
• 刊物类别：Engineering
• 刊物主题：Extraterrestrial Physics and Space Sciences
  Aerospace Technology and Astronautics
  Classical Continuum Physics
  
• 出版者：Springer Netherlands
• ISSN：1875-0494

文摘

Effects of confined spaces on flame spread over thin solid fuels in a low-speed opposing flow is investigated by combined use of microgravity experiments and computations. The flame behaviors are observed to depend strongly on the height of the flow tunnel. In particular, a non-monotonic trend of flame spread rate versus tunnel height is found, with the fastest flame occurring in the 3 cm high tunnel. The flame length and the total heat release rate from the flame also change with tunnel height, and a faster flame has a larger length and a higher heat release rate. The computation analyses indicate that a confined space modifies the flow around the spreading flame. The confinement restricts the thermal expansion and accelerates the flow in the streamwise direction. Above the flame, the flow deflects back from the tunnel wall. This inward flow pushes the flame towards the fuel surface, and increases oxygen transport into the flame. Such a flow modification explains the variations of flame spread rate and flame length with tunnel height. The present results suggest that the confinement effects on flame behavior in microgravity should be accounted to assess accurately the spacecraft fire hazard.