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通过两次地表火模拟实验,测量了地表火的主要燃烧参数,包括火蔓延速度、火焰高度、火墙厚度以及地表火火头前方的风速和温度,并计算得出对应的火线火强度.通过相关分析和回归分析,得出了以下结论:在火头前方空气中某点温度主要取决火强度和该点与火头的距离;离火头较近时辐射起决定性作用,在离火头距离小于25m以后,随着火头的接近,火头前方的风速有增大的趋势;对于900kW·m-1左右的中能量地表火,火头卷吸作用的范围大于6.5m.定性地说,蔓延速度快,火墙厚度就增大.
Through two surface fire simulations, the main burning parameters of surface fire were measured, including the spread of fire, the height of fire wall, the thickness of fire wall and the wind speed and temperature in front of fire. The fire intensity was calculated. Through the correlation analysis and regression analysis, the following conclusions are drawn: The temperature in the air in front of the fire head depends mainly on the fire intensity and the distance between the fire head and the fire point; the radiation from the fire head plays a decisive role and the distance to the fire head is less than 2 After 5 m, the wind speed in front of the fire head tends to increase with the approach of the fire head. For the medium-energy surface fire of about 900 kW · m-1, the entrainment effect of the fire head is greater than 6.5 m. Qualitatively speaking, spread faster, the wall thickness increases.