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结合某集中排烟隧道通风设计,通过CFD模拟,分析了排烟风口形状、风口间距对烟气控制效果的影响。模拟结果表明,集中排烟系统能获得良好的烟气控制效果;排风诱导风速随着火灾热释放速率的增大、排烟口下游烟气扩散范围的缩小而增大;热释放速率、烟气扩散距离一定时,排烟风口形状由正方形变为横向矩形布置、增大风口间距,均可以有效降低诱导风速。在数值模拟的基础上,得到了适合工程应用的量纲一准则关联式,并对隧道集中排烟系统进行了优化设计。
Combined with the ventilation design of a certain smoke exhaust tunnel, the effect of smoke exhaust opening shape and air outlet spacing on flue gas control effect was analyzed by CFD simulation. The simulation results show that the centralized exhaust system can obtain good flue gas control effect. The exhaust-induced wind speed increases with the increase of the heat release rate of the fire and the decrease of the diffusion range of the flue gas downstream of the exhaust opening. The heat release rate, When the gas diffusion distance is constant, the shape of the exhaust vent changes from square to transverse rectangular arrangement, and increasing the air-outlet spacing can effectively reduce the induced wind speed. On the basis of numerical simulation, a dimension-criterion correlation suitable for engineering application is obtained, and the tunnel smoke exhaust system is optimized.