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通过FDS数值模拟分析不同开口高宽比、L型外立面和U型外立面条件下的开口溢出火焰形态、火焰高度和外立面辐射热流密度变化规律。结果表明,单侧翼墙条件下的平均火焰高度比无翼墙限制条件下的火焰高出10%以上,双侧翼墙限制条件下的平均火焰高度比无翼墙条件下高出60%以上;溢出火焰的附壁燃烧程度在外立面构造形式从无翼墙、单侧翼墙、双侧翼墙的变化过程中逐渐增强,对外立面产生的辐射热流密度也随之明显升高,且火焰在双侧翼墙条件下完全发生附壁燃烧,对建筑外立面形成的火灾危害显著增大;开口高宽比越大,火焰高度越高。
The FDS numerical simulation was used to analyze the variation of flame shape, flame height and radiant heat flux density at the opening with different opening aspect ratio, L-shaped facade and U-shaped facade. The results show that the average flame height under unilateral wing wall conditions is more than 10% higher than that without wing limitation and the average flame height under the limitation of both wing wings is over 60% higher than that without wing wall. The degree of wall-burning of the spilled flame gradually increases from the change of the structure without the wing wall, the one-sided wing wall and the two-sided wing wall to the radiant flame. The radiation heat flux density on the facade also increases obviously, Under the condition of double-sided wing wall, the occurrence of wall-burning completely occurred, which greatly increased the fire hazard to the facade of the building. The larger the aspect ratio, the higher the flame height.