论文部分内容阅读
为了研究地表火卷吸作用的范围和迎面火与主火相互作用的机理 ,在大空间室内实验室进行了实验研究 .在该实验室实验可以避免环境风和环境温度变化的影响 .研究结果表明 :(1)在火头前方有明显的逆风区存在 .在逆风区下部的逆风风速要比上部的大 ,而且当高度达到某一数值时 ,逆风就不明显了 ;(2 )迎面火与主火之间即使相距较远也存在相互作用 .当它们相互接近到一定程度时 ,彼此相互吸引 .这使得火的蔓延速度显著升高 .对于火线火强度为 16 0kW·m-1地表火来说 ,蔓延速度增加2 7% .
In order to study the range of surface fire entrainment and the mechanism of the interaction between fire and main fire, an experiment was carried out in a large indoor laboratory, which can avoid the influence of ambient wind and ambient temperature changes.The results show that : (1) There is a significant headwind zone in front of the fire head, and the headwind velocity in the lower part of the headwind zone is larger than that in the upper part, and when the height reaches a certain value, the headwind is not obvious; (2) When they are close to each other to a certain extent, mutual attraction, which makes the spread of fire increased significantly.For the fire line fire intensity of 16 0kW m-1 surface fire, The rate of spread increased by 27%.