Numerical Simulation Of Fire Smoke Flow In Typical Structure Of Building Corridor

With the continuous development of urbanization, the building structure also has become increasingly diverse, with building fire risk is increasing.This paper selects the straight, L, T and circular corridor four kinds of typical structure as the research object, using FDS to analyze the Fire smoke flow pattern of four kinds of typical structure of the corridor. It concluded that building structure for the influence of temperature, flue gas velocity, the density of soot and smoke layer height:Straight corridor only produce high temperature near the fire because of the simple structure, the end of the corridor due to backflow phenomenon and makes the temperature rise and reduce smoke layer height. For L and circular corridor with closed Angle,the flue gas was accumulated easily because of the building block of closed structure and the buoyancy effect, Which leads to the corridor corner temperature rise, the flue gas velocity and soot density fluctuate and smoke layer height decreased. These places tend to form the danger zone. And circular corridor of natural smoke exhaust mouth have very good cooling exhaust effect. T intersection corridor has good liquidity, relatively safe. However, the flue gas easy to accumulate at the end of the corridor no matter what kinds of corridors.Conclude that corridor structure has a great impact on the fire smoke. In summary, for building structure is relatively simple, smoke spread law is relatively simple, not easy to form the danger zone. In closed Angle of the structure of the corridor, measures should be set for cooling and exhausting smoke.In contrast, some open areas, such as T intersection, is safer. The same is, the end of the four kind corridor appear the back flue and the smoke of reflux is often very dangerous. However, now a lot of personnel evacuation exits and stairs are set on both ends of the corridor, bad for evacuation. In this paper, the author thinks that 3 to 8 meters away from the end of the corridor setting security exit or stairs is more secure.