Fire Ventilation And Smoke Exhaust Mode Of Long Subway Tunnel

There are many studies about fire in a running tunnel so far, and its only one researchobject stuck in the tunnel when there is fire,but its relatively few research about the situationthat. two more trains moving between the Subway internal at the same time.Usually longsubway tunnel with the method of setting the intermediate shaft which is separated into two orseveral short intervals, through the ventilation shaft burning train isolation in independentventilation interval and controlling only a train is stranded in each tunnel, at this point thesmoke control mode is the same as the standard tunnel. In this paper, the fire smoke flowcharacteristics is studied when central fire of the train stopped at the shaft.The main work andresearch results are as follows:（1）According to Froude similarity criterion, and a1:10local interval tunnel experimentmodel which composed of tunnels and different heights was set up. The mass loss rate ofthree different sizes of oil pan was tested by using electronic scale, the corresponding fireintensity was calculated, and the data of temperature distribution and CO concentrationdistribution in tunnel when there is a fire was recorded.（2）The study of natural smoke filling,under different fire source intensity and differentshaft height, temperature distribution inside the tunnel ceiling, at the eyes feature height(fromthe evacuation platform height1.7m,from the bottom rail height2.75m) and CO concentrationdistribution law. When the intensity of a fire source certain, study different longitudinal shaftspeed and exhaust ventilation speed, the temperature distribution in tunnel ceiling, the heightat human eyes feature leave and the CO concentration distribution law.（3）Using FDS software to build tunnel model just like the corresponding full-size bench, analysis the temperature distribution in the subway tunnel and the distribution ofconcentration of carbon monoxide.（4）Using FDS software to establish metro tunnel model the full-size is180m long thoughstudying by numerical simulation of smoke spread in the natural laws of the filling andmechanical longitudinal ventilation flue gas temperature distribution in the roof, the height ofthe eye characterized by temperature distribution, CO concentration distribution and visibilitydistribution.