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研究地表火蔓延过程中火线提供给地表面的辐照度,探讨风速、坡度对它的影响。通过火焰特征的分析,建立火线火焰区的热辐射模型,推导火线给地表面的辐照度的计算公式;提出用火焰平均高度作为长度单位,定义火环境的空间参数(ξ、η、ζ)和火环境的辐射场空间属性函数f(ξ,η,ζ),推导火焰覆盖区的辐照度的计算公式。结果表明:火线提供给地表面的辐照度和火焰表面温度、火强度、火焰平均高度、考察点的位置等因素有关,它受风速、坡度因素制约。火线逼近可燃物的暂短时间内,太阳给地表面的辐照度可以忽略不计。
To study the irradiance provided by FireWire to the ground surface during the spread of surface fire, and to discuss the influence of wind speed and slope on it. Based on the analysis of the flame characteristics, the thermal radiation model of the fire line flame area is established and the formula for calculating the irradiance of the fire line to the ground surface is derived. The average flame height is taken as the unit of length and the spatial parameters (ξ, η, ζ) And fire environment radiation field space property function f (ξ, η, ζ), derive the calculation formula of the irradiance of the flame coverage area. The results show that the irradiance provided by the fire line to the ground surface is related to the temperature of the flame surface, the intensity of the fire, the average height of the flame, the location of the inspection site and other factors. It is restricted by the wind speed and slope. Fire near the ignitable combustible short period of time, the sun to the surface of the irradiance can be ignored.