Study on the effectiveness of single-sided and double-sided mechanical smoke exhaust in the upper lane of a double-layer Tunnel
To investigate the impact of single-sided and double-sided mechanical smoke exhaust on fire smoke control and spread at the upper lane in a double-deck tunnel,FDS was used to con-duct a comparative study on the smoke control effectiveness in a typical double-deck tunnel under different exhaust control modes.Based on illustrating the rationality of the model,the smoke spreading distance,gas mass flow rate and temperature distribu-tion at the smoke exhaust vent were comparatively analyzed under different smoke exhaust fan opening modes.The study showed that the gas mass flow rate distribution at the smoke exhaust out-let shows different patterns when the exhaust fan is activated on the single-side or double-side.When the smoke exhaust fans on both sides of the tunnel are turned on,the smoke spread range is the smallest,which is 47.8%～88.1%of the exhaust fan on the downstream side of the tunnel are opened under the same smoke exhaust volume.And the average temperature at each smoke ex-haust outlet is lower,which comprehensively reflects that turning on the smoke exhaust fans on both sides of the tunnel has a better smoke control effect.In addition,the variation of the tunnel smoke spread range with the fire source position under the single-side and double-side smoke exhaust modes was also discussed.
double-deck shield tunnelmechanical smoke ex-haustsmoke spreading distanceexhaust volume of smoke venttemperature field
万方数据
维普
