Geometrical Effects of a Narrow Channel on Flame Spread in an Opposed Flow
Geometrical Effects of a Narrow Channel on Flame Spread in an Opposed Flow
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DOI：
10.1080/00102202.2017.1394848
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发表时间：
2018-01-01
影响因子：
1.9
通讯作者：
Nakamura, Yuji
中科院分区：
文献类型：
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作者：
Matsuoka, Tsuneyoshi;Nakashima, Kentaro;Nakamura, Yuji
实验研究了几何形状对窄通道内热厚可燃物火焰传播的影响。两个系列的实验进行了两种燃料的几何形状，以形成一个狭窄的通道：平行板和圆柱。两个通道都是由聚甲基丙烯酸甲酯制成的，聚甲基丙烯酸甲酯也用作可燃样品，通道高度从1 mm到10 mm不等。以30 cm/s或90 cm/s的指定速度提供氧化剂流。观察到火焰在与氧化剂流相反的方向上通过通道传播。尽管利差率有相似的趋势，但在相同条件下它们的值之间略有差异。有效速度和过剩体积比进行了评估，以解释的几何效应。因此，它是建议，由于通道几何形状的速度剖面的变化是影响扩展速率的主要因素。
Geometrical effects on the flame spread over thermally thick combustibles in a narrow channel were experimentally investigated. Two series of experiments were conducted with two kinds of fuel geometry to form a narrow channel: parallel plates and cylinder. Both channels were made of polymethyl methacrylate, which also served as a combustible specimen, and the channel height varied from 1 mm to 10 mm. An oxidizer flow was supplied at specified velocities of 30 cm/s or 90 cm/s. The flame spread through the channels in the direction opposite to the oxidizer flow was observed. Although the spread rates had similar trends, there was a slight difference between their values at the same conditions. The effective velocity and the excess-volume ratio were evaluated to explain the geometrical effects. Accordingly, it is suggested that the variation of the velocity profile due to the channel geometry is the main factor affecting the spread rate.