大空间建筑烟气填充研究方法的对比

Comparative investigation of smoke filling method in large space building

为了对大空间建筑烟气填充研究方法进行对比分析。以一个废弃的大空间仓库为研究对象,采用了全尺寸火灾实验、计算机数值模拟和理论分析相互应用验证的研究方法,研究理论及数值模拟两种火灾烟气层高度的描述方法的准确性。结果表明当采用t2火模型时,在与现实的吻合程度方面,数值模拟>Zukoski理论模型>Yamana-Tanaka理论模型;随着火灾的不断发展,相对误差逐渐增大。通过对比分析发现,全尺寸实验、理论模型和数值模拟三种方法相互验证可以更好地保证研究的准确性;总结得到了两种与现实较吻合的描述烟气层高度的理论方法,并且提出减小误差应注意的几点事项,包括尽可能提高火源热释放速率、烟气层温度描述的准确性;不考虑火源热量通过建筑边界结构散失等。

The different methods of smoke filling in the large space building were compared and analyzed.Taking an abandoned large space warehouse as the research object,the mutual-proven research methods among a full scale fire experiment,computer simulation and theoretical analysis were carried out,and the accuracy between reality and two methods including theoretical and numerical simulation was studied.The results showed that when carrying out t2 fire model,on degree of fitting with reality,numerical simulation was the more accurate method than Zukoski theoretical model and Yamana-Tanaka theoretical model,and with development of fire,the errors became more and more large.By comparative analysis,it was found that,mutual authentication among full-scale experiments,numerical simulation and theoretical studies could be better to ensure the accuracy of the study;summing up two theoretical description methods of smoke layer height,and some matters which could reduce the errors were put forward,including the accuracy improvement of the fire heat release rate＇s description and smoke layer temperature＇s description,and overlook the heat loss of fire source through the building structure such as the border,etc.