水滴对火焰辐射热流衰减的实验研究

K. Usui, K. Matsuyama
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引用次数: 9

摘要

喷水灭火系统,如洒水灭火系统,在许多建筑物中都有安装,是一种非常有效的围护结构防火方法。另一方面,喷水灭火系统(以下简称SP)还会产生其他作用,如对隔室的冷却作用、对建筑结构的冷却作用、对火灾辐射热流的衰减等。本文通过全尺寸实验研究了水滴对辐射热通量的衰减。以正庚烷和乙醇为燃料,比较了烟灰颗粒对燃料性能的影响。实验中使用了5种喷头。首先,研究了喷嘴和火焰的基本数据,如液滴直径、液滴速度和水滴分布以及火焰的辐射光谱。利用Mie理论计算了辐射热流的吸收和透射率。并利用改进的辐射谱预测模型对火焰的辐射谱进行了预测。因此,可以利用上述火焰数据和基本SP数据计算辐射热通量的吸收和透射率。参数化计算结果表明,随着液滴直径的减小,辐射热衰减增大。并且,它的增加近似线性地依赖于液滴总量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Experimental Study on Attenuation of Radiant Heat Flux from Flame through Water Droplets
Suppression system by water spray such as sprinkler system is installed in many buildings and well-known as one of highly effective fire protection methods for enclosure. On the other hand, sprinkler system (hereinafter referred to as SP) would have other effects, such as cooling effect in a compartment, cooling effect of building structure and attenuation of radiant heat flux from fire. In this paper, attenuation of radiant heat flux through water droplets were investigated by full-scale experiments. The fuels were used nheptane and ethanol for comparison of influence of soot particle. 5 kinds of sprinkler nozzles were used in the experiment. Firstly, the fundamental data of the nozzles and flame such as droplets diameter, droplets velocity and distribution of water droplets and radiant spectrum of flame were investigated. Moreover, absorption and transmittance of radiant heat flux was calculated by the Mie theory. And also, an improved prediction model on radiant spectrum was used to predict the radiant spectrum of flame. Thus, absorption and transmittance of radiant heat flux can be calculated by above flame data and fundamental SP data. As the result of calculation parametrically, radiant heat attenuation increases with decreases of droplets diameter. And, it increase approximately linearly depends on amount of total droplets.
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