Numerical Simulation Research Of Smoke Control On Moving Train Fire In Subway Tunnel

With the acceleration of social economic and urban construction, and the requirement of people getting around, subway has become one of the most important vehicles in Beijing and is developing at high speed. For the problem of subway fire in tunnels, most researches on account of the situation when the train remains in the tunnel. There are only a few researches for moving fire in subway tunnel. At the same time, the subway train design specification has not clearly provided the safety speed of the train in the tunnel and the operational mode of ventilation and smoke extraction system. Therefore, it is very necessary to study the fire characteristic of moving subway fire, which is helpful for promoting the researches on the safety of on-fire train moving in the subway tunnel. The research is of great realistic significance and scientific significance. Nowadays, the main research methods of the subway system fire are full-scale test, model experiment and numerical simulation. Computer simulation is an important research method for subway fire.The paper takes a Beijing subway tunnel as the research object, and study the fire characteristic of moving subway train mainly through the method of numerical simulation. This paper takes simulation of original dimension model of the subway tunnel using CFD software STAR-CCM+. After verified the simulation result of the experiment, the paper takes research on moving fire of subway train for conditions by the way through the method of moving reference frames, and found the relationship between distribution of the smoke temperature and the speed of the train. At the same time, the paper studies the influence to the subway fire of the longitudinal ventilation wind. The results show that: the highest temperature reduces with the increase of train's speed, and the temperature will be lower if with longitudinal ventilation wind in the tunnel; The influence range of fire smoke will be enlarge with increasing of both train's speed and longitudinal ventilation wind. When the train is running at speed of50km/h, The temperature above the train is lower, and the highest temperature behind the train is also lower than the standards. The final conclusion is that the reasonable speed of the moving subway fire should be50km/h.