Simulation study of the effect of fire smoke flow on the evacuation efficiency of the corridor in semi-open shaft
To explore the impact of fire smoke flow on evacuation safety under the coupling of the exterior corridor and semi-open shaft structure design,Revit software was used to establish one-to-one high-rise residential simulation models,and PyroSim software was used to simulate the smoke flow process of different fire source power,patio structure factor,and stairwell opening changes under two types of fire scenarios.PyroSim software mainly uses large eddy simulations to solve the flue gas flow process.In this paper,the actual combustion model was established by calculation and assumption for analyzing the potential smoke propagation hazards of connecting corridors and indoors.Besides,the applicability of the simulation results was verified by the simplified model and different working conditions.Finally,the flow velocity,temperature,CO concentration,and visibility of flue gas were analyzed.The results show that:(1)The upper corridor of patio fire is mainly affected by the horizontal diffusion of smoke,and the more pronounced the horizontal diffusion,the lower the safety maintenance time.The safety maintenance time of patio fire corridor evacuation is most affected by the dimming properties of the smoke,and the smoke temperature does not affect it.Because the safety of the upper floor corridor is most involved,installing fixed fire windows instead of automatic closed fire windows in the high-rise patio is recommended.If we want to analyze the change in flue gas concentration,we also need to consider the influence of the shape of the patio.(2)The safety maintenance time of the corridor on the upper floor of the fire floor due to the smoke diffusion of indoor fire is less than the safe evacuation time available for indoor escape.It is important to ensure that the fire door and fire window are closed daily,and it is very important to close the door when the occupants escape.The research provides a favorable theoretical basis for fire safety management and renovation design.
public safetynumerical simulationhigh-rise housingsmoke spreadcorridorsshaft
万方数据
维普
