Extinction of gas and liquid pool fires with water sprays
Extinction of gas and liquid pool fires with water sprays
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DOI：
10.1016/s0379-7112(02)00085-1
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发表时间：
2003-06-01
影响因子：
3.1
通讯作者：
Heskestad, G
中科院分区：
文献类型：
--
作者：
Heskestad, G
在两个线性尺度上，一个比另一个大三倍，研究了开放空间中池火火焰由向下定向的水喷雾的熄灭。圆形池火灾被用作火源，主要是在气体排放（甲烷）的形式，从水平的砂表面，但在有限的程度上，在庚烷池的形式。结果显示在标准化图的基础上验证在以前的研究中的标度理论。从甲烷火灾的熄灭数据是不敏感的喷嘴放电的初始喷雾角。数据是一致的工程关系示出熄灭水流量约成比例的有效喷嘴直径，和喷嘴高度和自由燃烧热释放率的0.4次方。这一结果已被解释为表明，可燃气体的喷雾诱导稀释是扑灭气体排放火灾的主要因素。从这项研究（正庚烷）和以前的调查（汽油，JP-5）的液体池火灾的灭绝数据是一致的甲烷数据，除了在灭绝的水率有点高。(C)2002爱思唯尔科技有限公司版权所有。
Extinction in open space of flames from pool fires by downwardly directed water sprays has been investigated on two linear scales, one three times larger than the other. Circular pool fires were employed as fire sources, mostly in the form of gas discharge (methane) from a horizontal sand surface but also, to a limited extent, in the form of heptane pools. The results are presented in normalized plots based on scaling theory verified in a previous study. Extinction data from the methane fires are insensitive to the initial spray angle of the nozzle discharge. The data are consistent with an engineering relation showing extinction water flow rate approximately proportional to an effective nozzle diameter, and to the 0.4-power of both nozzle height and freeburn heat release rate. This result has been interpreted to indicate that spray-induced dilution of the flammable gas is a major factor in extinguishing fires from gaseous discharge. Extinction data of liquid pool fires from this study (n-heptane) and previous investigations (gasoline, JP-5) are consistent with the methane data, except for somewhat higher water rates at extinction. (C) 2002 Elsevier Science Ltd. All rights reserved.