CFD Simulation Study on the Influence of External Wind on Natural Smoke Exhaust in Tall and Thin Atriums
Natural smoke exhaust is the main method for controlling smoke in atrium fires,and its smoke exhaust effect is influenced by environmental wind pressure,which can easily form a"chimney ef-fect".CFD simulation method was used to analyze the factors that affect natural smoke exhaust in the atri-um.The research results show that under natural smoke exhaust conditions,when the natural smoke ex-haust port in the atrium is located on the windward side and the wind speed is 5 m/s,the amount of cold air entering the atrium is large,and the inertia force generated is strong,which can make the natural smoke exhaust effect in the atrium ineffective.The smoke generated by the fire accumulates at the bottom of the atrium and cannot be discharged.When the natural smoke exhaust outlet in the atrium is located in the crosswind direction,the wind forms a shear flow on the surface of the natural smoke exhaust outlet,which acts as a sealing effect on the atrium and is not conducive to the natural smoke exhaust.Both typi-cal wind direction conditions are not conducive to the natural smoke exhaust system in the atrium,and the stability of the natural smoke exhaust system is weak.
tall and thin atriumexternal windatrium smokenatural smoke exhaustCFD simulation
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