Behavior Of The Reverse Flow In Front Of The Leading Flame Edge Spreading Over Fuel-soaked Sand In An Air Stream
Behavior Of The Reverse Flow In Front Of The Leading Flame Edge Spreading Over Fuel-soaked Sand In An Air Stream
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气流中燃料浸透的沙子上传播的前导火焰边缘前的逆流行为
DOI：
10.3801/iafss.fss.3-227
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
T. Hirano
中科院分区：
文献类型：
--
作者：
T. Suzuki;M. Kawamata;K. Matsumoto;T. Hirano
本文研究了在流场中的反向流动行为。本文用几种流动显示技术研究了火焰前缘在煤油浸砂上的传播，并讨论了反向流动在火焰传播中的作用。在自由流速度U从30 ~ 210 cm/s的较宽范围内，在自由流速度U的作用下，存在一个稳定的逆流区。火焰前缘的水平尺寸几乎与U.当U增加时，反向流动的速度增加。反向流动对火焰在反向气流中的稳定传播起着重要作用，尽管它没有明显的作用。在火焰传播率上。反向流动提供了一个缓慢的气流区域，通过该区域，气化燃料以及来自反应区的热量将在上游方向上传递。
The behavior of the reverse flow in f r o nt. of t.h e leading flame edge spreading over kerosene-soaked sand in an a i r s t.r e a:n has been examined using a few flow visualization techniques, and r.h e role of t.h e reverse flow in the flame spread is discussed. In a wide range of the free stream velocities U from 30 t.o 210 cm/s, a stable reverse flow region in f r o nt. of the leading flame edge was observed clearly, and its horizontal dimension was found to be almost independent of U. As U increases, the velocity of the reverse flow increases. The reverse flow takes an important role in the stable flame spread in an opposed air stream, although it has no apprec iable e f f e ct. on the f lame spread rate. The reverse f low provides a slow gas stream region, through which gasified fuel as well as heat from the reacteion zone would be transferred in the upstream direction.