基于SGS模型的建筑火灾烟气数值模拟与实验验证

Numerical simulation and experimental verification for smoke flow of building fire based on SGS model

研究合理的火灾烟气运动数值模拟方法,指导建筑结构中防排烟与通风装置的设计布局。在大涡模拟方法的基础上,结合SGS湍流燃烧模型,对某地下通道内的火灾烟气运动进行数值计算。得出不同火源功率与排烟补风情况下通道内烟气温度分布与蔓延情况。设计4种对应于模拟工况的实验,对数值计算结果进行验证。根据验证结果可以看出,提出的改进方法对于建筑火灾烟气运动规律的计算比较合理。

A reasonable numerical simulation method for fire smoke was researched for the design of the building structure and smoke ventilation device. On the basis of large-eddy simu- lation methods combined with SGS turbulent combustion mod- el, the fire smoke flow within a subterranean passage was cal- culated. The temperature distribution within the channel and the spread of smoke were gained under different tests with vari- ous source of fire and wind power. Then four different experi- ments according to the case of calculation were conducted to validate the results of the numerical calculations. From the re- suits, we find that the improved method was reasonable for the calculation of fire smoke flow.