火源位置对深井火灾烟气流动影响的数值模拟

Numerical Simulation of the Influence of Fire Source Location on Fires Smoke Flow in Deep Well

探究深井立式空间中不同火源位置对火灾严重程度的影响,构建深井立式空间模型,通过数值模拟法分析火源的热释放速率、火源与墙壁距离对深井立式空间火灾烟气流动、烟气温度和速度的影响。结果表明:在深井立式空间中,火羽流易受到墙壁限制。当火源向单侧墙壁靠近时,火羽流向近壁面倾斜。在同等条件下,火源越靠近单侧墙壁,火源正上方的烟气高度和温度越高,烟气向上流动速度越快。在模拟结果基础上使用公式拟合得到羽流温度与深度、火源距与墙壁距离的关系式。

This paper explored the influence of different fire source locations on the severity of fire in deep well vertical space,and constructed a deep well vertical space model.Through numerical simulation,the heat release rate of the fire source and the distance between the fire source and the wall on the smoke flow,smoke temperature,and velocity in deep well vertical spaces were analyzed.The results indicated that in vertical deep well spaces,the fire plume flow is easily restricted by walls.When the fire source approaches a single wall,the flame plume will tilt towards the near wall surface.Under the same time conditions,the closer the fire source is to a single wall,the higher the height and temperature of the smoke directly above the fire source,and the faster the upward flow speed of the smoke.Based on the simulation results,a formula is used to fit the relationship between plume temperature and depth,as well as the distance between the fire source and the wall.