室外风下建筑外立面火溢流阻隔技术研究

Study on structural barrier to vertical spread of window spill plume along building exterior faade under external wind

以全尺寸双层建筑为火灾试验模型,采用数值模拟的方法,模拟低速及高速侧吹风两种室外风条件下,不同的窗口、窗槛墙及阳台尺寸对建筑外立面开口火溢流蔓延的阻隔情况。运用数值拟合找出不同室外风条件下建筑外立面开口火溢流扩散程度与窗口宽度、窗槛墙高度及阳台伸长之间的相关性。结果表明:低速侧吹风状况下,火溢流顺风斜向上蔓延,阳台宽度起主导阻隔作用;高速侧吹风状况下,火溢流顺风横向蔓延,阳台伸长起主导阻隔作用。

Using a full scale 2 storey building as fire experiment model, simulation were conducted to simulate the barrier of window spill plume along building exterior facade on conditions of low-speed and high-speed side-blown wind, and under differ- ent dimensions of windows, windowsill walls and balconies,. Then the correlation between fire spreading near the exterior fa- cade and dimensions of window, windowsill wall and balcony was obtained by numerical fitting and dimensional analyses.The correlation indicates that, on low-speed side-blown wind, spill plume spreading diagonal up downwind, and balcony width plays a leading barrier; on high-speed side-blown wind, spill plume horizontal spreading downwind, and balcony extension plays a leading barrier.