Studies On Smoke Movement And Smoke Management In Commerce Underground Constructions' Fire

In the modern time, more and more underground construction has been put in use as a result of fast development of cities and vast increase of population. Underground commercial construction shows the higher fire fatalness within all types of underground construction. Studies on smoke movement and control in underground commercial construction have become a hot topic in the field of fire research.This thesis conducts a thorough survey on the literature in the field of smoke movement and management. An analysis of design method for the system of smoke management is also provided. Research on smoke movement in underground commercial construction and corresponding influential factors is set as the core topic of the thesis.The determination of mathematical models adopted and the corresponding verification of rational mesh structure are very important to the results of CFD numerical simulation. By comparing the obtained simulation results with results from that of the experiments conducted by Sichuan Scientific Research Academy of Fire Safety, this thesis ascertains the rational model of k -ε two equations with the six-flux module.Considering the different characteristics of underground commercial construction, in-situ investigations are conducted, and a proper geometry model is chosen. Software CFD is used to simulate smoke movement and management in underground commercial construction for the purpose of research on fire protection.From the simulation, the thesis reveals effective factors of natural smoke-eject in underground commercial construction. The research also works on positioning of smoke-controlling devices, smoke quantity and the quantity of supplementary air under various mechanical-eject conditions, and the overall effect of these factors is deduced.