Numerical Simulation Of Smoke Exhaust Mode In Corridor In High-Rise Building

Building fire is such a disaster that happens frequently and causes huge destroy of property, especially safety of people in building. Previous data show that the main reason of death is smoke. Smoke can keep out of light, hold toxic gas, with high temperatures, which also cause delay of evacuating time. Several toxic gases from burning consume large number of oxygen, can make people choked, and even cause people's body burnt to death.Up to now, there are three mature mathematics models established: net model, zone model and field model. However it is limited to study high-rise building fire by using any kind of these models. The only way to solve the problem is to compound them together and exert their strong suits. Author collects 69 building fire models within international scope and classifies them with the principle mentioned in preamble. Author compounds field model FDS with zone model CFAST, simulates smoke movement under exhaust system with field-zone compound model. Author emphasis on smoke spread in corridor, and analyzes smoke temperature, concentration and layer height in corridor. The article introduces the algorithms, procedures of CFAST and also reference of how to use it. The data which FDS generates are used to define input key parameter of CFAST.Representative building models with different forms of corridor are chosen. Field-zone compound model is used to simulate and analyze smoke movement in corridor, under different smoke exhaust system. Wind in outdoor, season, position of fire room, length of corridor, size of windows are considered, when simulates natural exhaust. Airflow rate, vent configuration and different projects are discussed in simulation of mechanical exhaust system, considering leakage of building. Parameters set up in mechanical exhaust are based on"Code for fire protection design of tall buildings". Making comparison and analysis of result, from which obtain the conclusion and also make revision and supplement of the code with regard to smoke exhaust section.