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NUMERICAL STUDIES ON FIRE SMOKE DESCENT AND SMOKE EXHAUST METHOD IN A LARGE GYMNASIUM

QIN Ting-Xin GUO Yin-Cheng LIN Wen-Yi (Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China)  
The smoke exhaust capability of different smoke exhaust methods were studied in this paper. The simulation results show that the temperature of the smoke layer is not high, but the descent of the smoke layer is very rapid when no smoke exhaust system. It is found that the smoke exhaust efficiency is very high under the condition of roof natural smoke exhaust method, and the smoke exhaust capability of the roof mechanical smoke exhaust system is decided by the comparison of the mechanical smoke exhaust velocity with the natural smoke exhaust velocity. Under the condition of smoke exhaust system located on the wall, the remarkable smoke exhaust performance was found only when the smoke layer descended under the wall smoke exhaust vent. When the smoke exhaust fluxes are equal in different smoke exhaust systems located on the wall, the horizontal position and the number of the smoke exhaust vents hardly affected the smoke exhaust capability.
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