Research on Smoke Exhausting Efficiency in Different Smoke Control Model of Different Stair Structures in Subway Station Fire

The platform layer of the subway station is a confined space,so the different structures,such as the location and structure of stairs,have a vital influence in the subway station fires.In this paper,the fire was located on the carriages of the train on platform layer to simulate the smoke diffusion by CFD,the effects of different structure on different smoke control models had been compared.And the results indicated that the hang wall and the down air flow could block the smoke in the smoke-preventing subarea near fire source,the vertical smoke-exhausting model was more efficient than the transverse model which exhausted the smoke and the air at the same time.Comparing the results,the stairs of vertical smoke-exhausting model as ■■■■ setting was most advantageous.