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为研究三级排烟模式且顶部设有自然排烟窗的室内商业步行街火灾烟气蔓延特性,在步行街首层环廊位置进行热态发烟试验。结果表明:相比于两级排烟,三级排烟模式下环廊排烟可有效阻止烟气蔓延至步行街高大空间;一旦发生小规模火灾或产生低热量烟气时,步行街顶部采用机械排烟方式比自然排烟方式具有明显的排烟效果,但排烟风机的延迟开启易造成烟气蔓延范围扩大。为了营造安全的疏散条件,避免烟气从环廊蔓延至步行街,应增大环廊排烟设备的能力。
In order to study the smoke evacuation characteristics of the indoor commercial pedestrian street with three-stage smoke exhaust mode and a natural smoke exhaust window at the top, a hot-smoking test was conducted on the first floor of the pedestrian gallery. The results show that compared with two-stage smoke exhaust, the gas exhaust in the three-stage smoke exhaust mode can effectively prevent the smoke from spreading to the pedestrian high-rise space. In the event of a small-scale fire or low-calorie smoke, Smoke way than the natural smoke exhaust has obvious smoke exhaust effect, but the exhaust fan open delay can easily lead to the expansion of smoke. In order to create a safe evacuation condition and to prevent the spread of flue gas from the corridor to the pedestrian precinct, the abilities of the exhaust system of the podium should be increased.