纵向风作用下沉管隧道不同排烟方式的排烟效果研究

Research on Smoke Exhaust Effect of Different Smoke Exhaust Methods in Immersed Tube Tunnel under Longitudinal Wind

为揭示环境风作用下沉管隧道不同通风方案的排烟效果,采用大涡模拟和对比法,研究了沉管隧道中3种不同排烟方式在不同纵向风作用下的通风性能,并基于烟气中一氧化碳质量守恒,提出了不同排烟方案下排烟效率的计算方法。最后,对不同纵向风速和不同通风设计方案下烟气蔓延情况和排烟效率进行对比研究,结果表明:顶部通风设计方案具有最佳的排烟效果;侧壁通风+挡烟垂壁的设计方案相比单一侧壁通风设计具有较好的排烟效果;在3种排烟方案下,适当的纵向风速可以提高隧道排烟效果。

In order to reveal the smoke extraction effects of different ventilation schemes in immersed tube tunnels with ambient wind,this paper compared the ventilation performance of three different smoke exhaust methods in immersed tunnels under different longitudinal winds by the large eddy simulation and comparative analysis method.Based on the conservation of carbon monoxide in the flue gas,the calculation methods of smoke exhaust efficiency under different smoke exhaust schemes are proposed.By comparing the spread of smoke and the ventilation efficiency under different longitudinal wind and ventilation schemes,the results indicate that the top vent design has the best smoke exhaust effect,and the sidewall vent design(with an activated vertical smoke screen)has a better smoke exhaust effect than the sidewall vent design.And a proper longitudinal wind can improve the smoke exhaust effect of the tunnel.