High-rise buildings are usually in a windy environment. The motion of fire-induced smoke and fire behaviors may be strongly affected by the external wind forces except by the stack effect. It turns out that wind with different directions and velocities can cause disparity in fire dynamics. Since most previous researches only focused on the cross wind conditions, this work investigated the effect of external side wind from 0 m/s to 1.21 m/s on the air flow behaviors, combustion characteristics of methanol pools and smoke temperature in a 1/6 scaled corridor connected to a 6-floor shaft. A remarkable observation is that the external side wind (parallel to top window, shown in Fig. 1 ) leads to pressure attenuation inside building and induces air to flow inside through bottom door. Therefore, the smoke spreads faster under the synergic effects of side wind and stack effect. At the steady stage, the supplement air flow velocity increases with wind velocity but remains proportional to 1/3 power of HRR. An equation incorporating the wind effect is proposed to predict the air flow velocity. Results also show that compared to cross wind conditions, the mass loss rates of methanol pools increase at high wind velocities. The wind effect on smoke temperature is obvious in cases with small pools. Here, the temperature first increases to a peak value and then decreases with increased wind velocity. However, the temperature remains the same in cases with large pools within our wind velocity range. The temperature in the shaft is also correlated with mass loss rate and wind velocity. This work shows that external side wind would increase the fire hazard of buildings by contributing to the combustion and spreading of smoke. Thus engineers should consider the effect of side wind carefully when designing smoke control system.

中文翻译：

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外侧风对竖井走廊火灾行为影响的试验研究

高层建筑通常处于有风的环境中。除烟囱效应外，火灾引起的烟雾运动和火灾行为可能会受到外部风力的强烈影响。事实证明，不同方向和速度的风会导致火灾动态的差异。由于以往的研究大多只集中在侧风条件下，本工作研究了从 0 m/s 到 1.21 m/s 的外侧风对空气流动行为、甲醇池燃烧特性和烟温的影响，在 1/6连接到 6 层竖井的缩放走廊。一个值得注意的观察结果是，外侧风（平行于顶部窗户，如图 1 所示）导致建筑物内部的压力衰减，并导致空气通过底门流入内部。所以，在侧风和烟囱效应的协同作用下，烟雾扩散得更快。在稳定阶段，补风流速随风速增加，但仍与 HRR 的 1/3 次方成正比。提出了一个结合风效应的方程来预测空气流速。结果还表明，与侧风条件相比，甲醇池的质量损失率在高风速下增加。在小水池的情况下，风对烟温的影响很明显。在这里，温度首先升高到峰值，然后随着风速的增加而降低。然而，在我们的风速范围内有大水池的情况下，温度保持不变。竖井中的温度还与质量损失率和风速相关。这项工作表明，外部侧风会通过促进烟雾的燃烧和扩散来增加建筑物的火灾危险。因此工程师在设计烟雾控制系统时应仔细考虑侧风的影响。