集中排烟公路隧道排烟阀下方烟气层吸穿现象研究

Study on smoke layering plugholing under the exhaust damper of central smoke extraction model during highway tunnel fire

以水平公路隧道为研究对象,分析30 MW火灾下的排烟速率理论计算方法及排烟阀下方发生吸穿现象时的烟气层厚度临界值。通过数值模拟,获得不同排烟速率下排烟阀下方的温度、流速、烟气层厚度,验证了排烟阀下方烟气层吸穿现象的存在,为集中排烟模式的优化提供参考。

The theoretical calculation method of exhaust velocity and the critical thickness of smoke layering under exhaust damper when plugholing occur in a horizontal highway tunnel under 30 MW fire were analyzed. The temperature, velocity and the smoke layering thickness under exhaust damper were obtained by numerical simulation. The phenomenon of smoke layering plugholing under exhaust damper with different exhaust velocities was confirmed, which would offer reference for the optimization ,of central smoke extraction model.