Research on High Power Fire Smoke Exhaust-ing Scheme for Straddle Monorail Tunnel with Large Slope
[Objective]The increase of fire power and slope steepness in straddle monorail tunnel will lead to the rise of critical wind speed for fire and the addition of smoke exhaust-ing equipment configuration.Therefore,it is necessary to con-duct research on the smoke exhausting scheme for the straddle monorail tunnel in the condition of large slope and high power fire.[Method]A 1:20 scale model test platform is estab-lished to calculate the critical wind speed in tunnels under var-ying heat release rates of fire sources and different slopes.The SES(subway environment simulation)software is used to es-tablish a numerical calculation model with one-dimension for the straddle monorail tunnel fire to calculate the configuration of smoke exhausting equipment required by tunnels with differ-ent slopes.[Result & Conclusion]The critical wind speed values in the straddle monorail tunnel under a high-power fire of 20 MW is obtained through a model test.When the slopes are-6％,-3％,0％,3％,and 6％,corresponding critical wind speeds of the fire are 3.55 m/s,3.33 m/s,2.91 m/s,2.57 m/s,and 2.46 m/s respectively.The configured air vol-ume of the station tunnel fans is linearly related to the slope:when the slope is 0％,-6％,6％,the corresponding air vol-ume of a single tunnel fan is approximately 75 m3/s,110 m3/s,46 m3/s respectively.Regarding the entrance tunnel,the configuration of the jet fans at the portal can be calculated in-versely with the station tunnel fans and the tunnel slope.For large slope tunnels in high-power fire conditions,the equip-ment configuration with uphill smoke exhausting differs signifi-cantly from that with downhill.Therefore,the uphill smoke exhausting scheme is proposed with priority to reduce equip-ment investment.
straddle monorail tunnellarge-slope tunnelhigh-power fire smoke exhausting
万方数据
维普
