Experimental study of flame propagation in propane-air mixture near rich flammability limits in microgravity
Experimental study of flame propagation in propane-air mixture near rich flammability limits in microgravity
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DOI：
10.1080/001022002900210362
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发表时间：
2002-09
影响因子：
1.9
通讯作者：
J. Jarosiński;J. Podfilipski;A. Gorczakowski;B. Veyssière
中科院分区：
文献类型：
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作者：
J. Jarosiński;J. Podfilipski;A. Gorczakowski;B. Veyssière
实验在由透明有机玻璃制成的8.5L容量的圆柱形密闭容器中进行。使用丙烷-空气混合物;测量压力历史。高速摄像机记录了火焰传播的历史。在实验期间，容器位于落塔组件的笼内。微重力实验从点燃容器底部或中心部分的易燃混合物开始。摄像机记录了火焰发展的变化，而压力记录表明了热释放速率的相应变化。将微重力实验与正常重力条件下进行的类似实验进行了比较。详细研究了混合气浓度在6.4%~ 9.5%C3H8时的火焰传播行为.发现微重力条件下的可燃性极限接近1 g时向上传播火焰的极限（9.0%C3H8对9.5%C3H8）。然而，火焰传播和压力历史的行为是完全不同的：在微重力下，火焰是不可见的，但燃烧是由压力上升。
The experiments were carried out in a cylindrical closed vessel of 8.5-L capacity, made of transparent organic glass. Propane-air mixture was used; pressure history was measured. A high-speed video camera recorded the history of flame propagation. During the experiments the vessel was located inside the cage of a drop-tower assembly. The microgravity experiments started with ignition of the flammable mixture at the bottom or central part of the vessel. The video camera registered changes in flame development while pressure records indicated corresponding changes in heat release rate. The microgravity experiments were compared with similar experiments conducted under normal gravity conditions. Behavior of flame propagation was investigated in detail for mixture concentrations between 6.4% and 9.5% C 3 H 8 . It was found that the flammability limit under microgravity conditions was close to the limit for upward-propagating flame at 1 g (9.0% C 3 H 8 versus 9.5% C 3 H 8 at 1 g ). However, the behavior of flame propagation and pressure history was completely different: Under microgravity the flame was not visible but combustion was indicated by pressure rise.