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《Journal of Safety and Environment》 2012-02
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Study on smoking exhaust efficiency under central exhaust mode in tunnel fires

PAN Yi-ping1,ZHAO Hong-li2,WU De-xing3,LI Wei-ping3(1 Fire Corps of Hunan Province,Changsha 410205,China;2 Institute of Disaster Prevention Science and Safety Technology,Central South University,Changsha 410075,China;3 Zhejiang Provincial Institute of Communications Planning,Design & Research,Hangzhou 310006,China)  
The paper is aiming to testing and measuring the effectiveness of smoke-exhausting strategies in the tunnels with the central exhaust system in regard to the smoking-exhaust efficiency.In order to improve our understanding of smoke exhaust mechanism,we have prepared a simulated model by using CFD based on the central exhausting system design of the road tunnel.To be exact,we have studied the effects of the ventilator number,the ventilation area and the design space on the total smoke-exhausting efficiency as well as the efficiency of each ventilator in various ventilation systems under two central exhaust modes of two-way and one-way smoke extraction.In this paper,we have laid out the ventilator numbers of 4,6,8,12,and the ventilation areas of 2.5, 4,6,8,10,with the spaces of 25,50,75,100 taken into full account.The results of our study show that the smoke can be extracted out of a tunnel effectively via the central exhaust system.By using the two-way ventilating mode,when the ventilation outlets are distributed on the both sides of smoke-fire outlet symmetrically,each ventilator tends to work more efficiently,however,the total efficiency of the smoke-exhaust system tends to be lower if the number of ventilator is reduced.In addition,the total efficiency is expected to rise if greater ventilation area and larger space would facilitate the smoke exhaust under the two-way exhaust mode.However,when more exhausting valves are working on or the ventilation area is larger under the one-way exhaust mode,the exhaust valves would likely fail if the smoke in the exhaust valves farthest from the fan flows into the driveway,according to which one possible solution is to open some exhaust valves on the sideway with no fans.In so doing,the total efficiency would be made higher with larger ventilation space.And,in turn,both under the two-way exhaust mode and one-way exhaust mode,the first or second exhaust valves near the fire source should be turned on.The final results should thus be made significant for establishing appropriate design scheme of the exhaust valves in the tunnel-disaster prevention.
【Fund】: 浙江省科技厅科技计划项目(2008C13041-2)
【CateGory Index】: U458.1
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