【摘要】 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。更多还原

【Abstract】 The irradiance from fire line to ground considering the effects of wind speed and slope were discussed in this paper. The radiation model of flame in fire hne of surface—fire was build up by the study of characteristics of flame. The formula for calculating irradiance from fire line to ground was deduced. The spatial parameters of fire environment(ε,η、ζ) and the spatial characteristic function of radiation of surface—fire f (ζ,η,ζ)by the length of flame height were defined. The formula, of the irradiance of zon covered flame was deduced. Theoretical results revealed that the irradiance of-surface—fire and relation to flame temperature, intensity, flame height and position of observation point. The irradiance of sun was a negligible quantity during the short period when the fire line spreed to this area.更多还原