| With the population of the city in the world quickly increasing, more and more vehicles bring out such problems: the traffic jam, the pollution of the environment and energy crisis, etc. Estimated by The expert that In 2010,The population of the world will exceed 6 billion , the number of city which have more than million people will also exceed 400.The traditional transportation such as buses and trolley bus will be abandoned .Because of the big carrying capacity, free from pollution ,the quicker speed, on time, comfortable, the convenience and saving energy, subway is soon developing .In a word, the country in the world paid more and more attention on developing subway in order to ameliorate the traffic jam.With the rapid progress of the economy and the urbanization in China, the subway as an effective method to solve the problem of traffic is developing quickly in our country. The city in China already having the subway or have started to construct subway: Beijing, Shanghai, Guangzhou, Tianjin, Dalian, Shenzhen , Chengdu etc. Because the subway environment differs from that in the building, also is not the same as that of underground building , therefore, this problem has nowadays become the focus. Airiness in the environment and a fire problem arose the attention early in the abroad,the research almost covers all the aspects. However, because of all kinds of factors, the related research on the problem lag behind in China.In order to discuss the flowing rule and the control of the smoke, a physical model of a two-layer and island type subway station is established in the paper, The three-dimensional field simulation about the spread of smoke when a train catches fire in the subway platform is carried out by computational fluid dynamics, adopt domestic and foreign dispersion standard to aim at the environment, get tASET—personnel available safe egress time and tRSET—required safe egress time to compare, under the condition of this fire, according to the...
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