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针对以往的火灾试验和数值模拟研究大多是在直线型隧道中进行的这一特点,以一非直线型公路隧道为研究对象,在全尺寸试验的基础上,针对不同的火源位置和火灾应急通风方案,对于火源功率为30 MW火灾的烟气运动与控制规律进行了数值模拟。结果表明:不同应急通风方案的烟气控制性能有很大差异;纵向风速对烟气迁移具有显著的影响;纵向风速增大,烟气回流现象显著减轻,但烟气前锋的运动亦同时加快;火源位于隧道圆弧形区域时,火源区纵向风速接近于零,阻碍了烟气沿隧道纵向的运动;现有的应急通风方案均不能有效控制烟气回流,应辅以其他通风措施。
In view of the fact that most of the previous fire tests and numerical simulations are conducted in linear tunnels, a non-linear highway tunnel is taken as the research object. Based on the full-scale test, different fire source locations and fire emergencies Ventilation scheme, the numerical simulation of flue gas movement and control law with a fire source power of 30 MW was carried out. The results show that flue gas control performance varies greatly with different emergency ventilation schemes. Longitudinal wind speed has a significant influence on flue gas migration. Longitudinal wind speed increases, flue gas backflow significantly reduces, but flue gas forward movement also accelerates. When the fire source is located in the arc-shaped area of the tunnel, the longitudinal wind speed near the source zone is close to zero, which hinders the longitudinal movement of flue gas along the tunnel. All the existing emergency ventilation schemes can not effectively control the flue gas backflow and other ventilation measures should be supplemented.