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通过在走廊与前室之间设置“走廊-前室缓冲区”来改善高层建筑传统前室正压送风系统。其完整设想是在前室前设置一段无烟区,通过防烟空气幕作为柔性隔断划分缓冲段和走廊段,并且在气幕前设置排烟口,排出多余的新鲜空气,从而避免影响火场机械排烟效率。利用全尺寸风洞试验台模拟高层建筑内的长廊型空间,重点考察缓冲区内空气幕倾角、射流速度及排气口排气量对缓冲区效果的影响。结果表明:0～60°范围内,空气幕倾角越大越好;在风量不超过总送风量规定下,空气幕射流速度越大越利于防烟,射流速度约为16m/s时,机械排烟效率较高;缓冲区排气口排烟量介于1 708～2 563m~3/h时,缓冲区的设置的效果最佳。当缓冲区内各因素的值满足以上设置时,能够提供较高的排烟效率,达到72.8%。既能保证走廊内烟气的及时排出,更有利于火灾时人员的安全疏散。
Improve the high-rise building’s traditional anteroom plenum by placing a “corridor-anterior chamber buffer” between the corridor and the anteroom. The complete idea is to set a smoke-free zone in front of the anteroom to divide the buffer section and the corridor section as a flexible partition through the smoke-proof air curtain and to arrange the exhaust port in front of the air curtain to discharge excess fresh air so as to avoid affecting the fire machine Smoke extraction efficiency. The full-scale wind tunnel test rig is used to simulate the corridor space in high-rise buildings. The impact of air curtain dip angle, jet velocity and exhaust volume on the buffer zone are mainly investigated. The results show that the bigger the angle of air curtain is, the better the angle of air curtain is in the range of 0 ~ 60 °. When the air volume does not exceed the total amount of air supply, the larger the air curtain jet velocity, the more conducive to smoke prevention. When the jet velocity is about 16m / s, High efficiency; buffer exhaust vent smoke between 1 708 ~ 2 563m ~ 3 / h, the buffer zone settings the best. When the value of each factor in the buffer satisfies the above setting, it can provide a higher smoke exhaust efficiency of 72.8%. Both to ensure the timely discharge of flue gas in the corridor, but also more conducive to the safety of personnel evacuation in the fire.