Experimental study on combustion and fire safety of energy conservation materials (extruded polystyrene, i.e., XPS) in vertical channel with front openings of building façade is conducted, and effects of channel structure factor (α) and curtain wall coverage rate (β) are revealed. The XPS flame in the vertical channel is turbulent. There is a correlation between the flame height and pyrolysis length: $x_f=m{x}_p^n$, where m and n vary with the change in structure factor and coverage rate. Upward flame spread rate decreases first and then increases as β rises. When $0\le \beta <0.2$, the restraining effect of vertical channel on air entrainment dominates, while for $0.2\le \beta \le 0.8$, the heat feedback from curtain wall dominates. When $\beta$ = 0, the influence of α on flame spread rate is not significant. The flame spread rate increases with increasing α when $0.2\le \beta \le 0.8$. A model is established to predict the flame spread rate under different coverage rates and structure factors. Compared with experimental results, the prediction error is smaller than 10%. Larger values of flame height and flame spread rate correspond to higher fire hazard. This work is beneficial for fire safety assessment of building thermal insulation materials and optimal design of energy-saving curtain wall.

进行了具有立面正面开口的垂直通道中节能材料（挤塑聚苯乙烯，即XPS）的燃烧和防火安全性的实验研究，揭示了通道结构因子（α）和幕墙覆盖率（β）的影响。 。垂直通道中的XPS火焰湍流。火焰高度和热解长度之间存在相关性：$X_F=米X_p^{ñ}$，其中m和n随结构因子和覆盖率的变化而变化。向上的火焰蔓延率先降低，然后随着β的增加而增加。什么时候$0\le \beta <0.2$，垂直通道对空气夹带的抑制作用占主导，而对于 $0.2\le \beta \le 0.8$，来自幕墙的热反馈占主导。什么时候$\beta$ = 0时，α对火焰蔓延速率的影响不明显。随着火焰传播速率增加α时$0.2\le \beta \le 0.8$。建立了一个模型来预测不同覆盖率和结构因素下的火焰蔓延率。与实验结果相比，预测误差小于10％。较高的火焰高度和火焰蔓延率值对应较高的火灾隐患。这项工作有利于建筑物隔热材料的防火安全评估和节能幕墙的优化设计。