列车阻塞工况隧道通风最不利条件分析

摘要

Tunnel ventilation design should be based on the most unfavorable condition of the subway train blocked in a tunnel.Taking a rail transit project as an example,with the CFD simulation,analyses the flow characteristics of three different relative positions of train to jet fan,concludes the influence of subway train block on rising pressure of jet fan and flow resistance loss,and provides the most unfavorable condition of the subway train blocked in a tunnel.Moreover,proposes the conversion coefficient of jet fan under the most unfavorable condition,in the expectation of providing reference for the rail transit project design.%隧道通风设计需按照列车阻塞工况的最不利条件进行。以某轨道交通实际工程为例，采用 CFD 模拟的手段，分析了列车与射流风机3种相对位置关系下的流动特性，总结出列车阻塞对射流风机升压力的影响和列车阻塞造成的流动阻力损失，分析出列车阻塞工况时的最不利情况；同时给出了射流风机在最不利条件下的折算系数，以供其他轨道交通工程设计时参考。