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通过求解流体Navier-Stokes方程对一综合体育馆火灾场景进行了数值模拟.模拟湍流采用Smagorinsky大涡模拟方法,模拟燃烧采用混合比例燃烧模型,对火灾工况下的流体流动做了低马赫数假设.通过对数值计算结果揭示的流场速度、温度、组分浓度等物理量的的分析,发现在火灾发生后,利用自然通风或机械通风排烟过程中,存在门效应和烟气堵塞两种不利于烟气控制的重要现象.在这两种效应的作用下,不合理的通风口位置,甚至机械通风的引入都可能导致排烟效果的恶化.分析了两种效应的产生原因和作用机理,最后对消除这两种现象提出了参考性体育场馆火灾通风设计.
The Navier-Stokes equation is used to simulate the fire scene of a gymnasium. The Smagorinsky large eddy simulation is used to simulate the turbulent flow and the mixed combustion model is used to simulate the turbulence. The hypothesis of low Mach number is made for the fluid flow under fire conditions. By analyzing the physical quantities such as flow velocity, temperature and component concentration revealed by the numerical calculation results, it is found that there are two kinds of detrimental effects of door effect and flue gas jamming in natural or mechanical ventilation after the fire, The important phenomenon of flue gas control.Under these two effects, the unreasonable position of vents and even the introduction of mechanical ventilation may lead to the deterioration of smoke exhaust.Analysis of the causes and mechanism of the two effects, and finally On the elimination of these two phenomena proposed a reference stadium fire ventilation design.