Study On Smoke Control Of Underground Urban Comprehensive Transportation Hub

In this paper,the underground city comprehensive transport hub in the transfer hall for the study,the use of literature review,field research,numerical simulation,theoretical analysis method to 'transfer the hall smoke control study design method.The main contents:Determine the architectural characteristics of the transfer hall and smoke control characteristics;In the theoretical analysis of the makeup air volume,exhaust port and method for determining the position of the outlet fill two-zone model of how to use ideal for smoke control large space calculated and summed up the theoretical amount of smoke currently employed,;according to setting principles fire scenario,set up seven different sizes of the transfer hall,using computational fluid dynamics software FDS smoke ability to transfer storage hall itself,the effect of smoke control conventional smoke control methods and maximum heat release rate,building size and position of the exhaust outlet effect effect transfers were studied;analysis of the amount of smoke and the smoke layer different transfer hall headroom height corresponding to a final stable relations,and the use of theoretical knowledge of fire dynamics,method of calculating the amount of smoke has been improved.The results showed that:1.Rely on interchanges hall itself accumulator smoke tobacco control capacity can not meet the design requirements,design of "quasi safe area" of the transfer hall smoke control system must be set up.2.Since the body mass transfer space is very large,fire process,the highest average temperature smoke layer is very small,less than at 70?.Therefore,when the smoke storey height where on people,not the effects of radiation hot smoke layer to personnel.3.Area transfer space to change smoke layer has little effect,but headroom transfer space has a significant effect on the smoke layer changes,the amount of smoke in the same situation,the less headroom smoke eventually stabilizing layer height smaller.4.Conventional smoke control design methods to meet the safety requirements for smoke control the height of the smaller case,but as the height increases tobacco control,which ultimately will be less than the height of the smoke layer stable design tobacco control height,no longer meet the requirements of safety design.5.Different headroom transfer space smoke control design,the amount of smoke in the hall transfers should not be less than the minimum amount of smoke in the corresponding table 6-1.According to the calculation formula or mechanical exhaust fan exhaust volume(6.3-4)calculable.