Experimental study on thermal safety analysis of flexible polyurethane at various facade inclined structures under low ambient pressure condition
Experimental study on thermal safety analysis of flexible polyurethane at various facade inclined structures under low ambient pressure condition
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低环境压力条件下各种立面倾斜结构柔性聚氨酯热安全分析试验研究
DOI：
10.1016/j.engstruct.2018.08.106
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发表时间：
2018-12
影响因子：
5.5
通讯作者：
Tingyong Fang
中科院分区：
文献类型：
--
作者：
Xin Ma;Ran Tu（涂然）;Chao Ding;Yi Zeng;Li Xu;Tingyong Fang
通过实验和理论研究，分析了低气压对建筑外墙保温材料柔性聚氨酯（FPU）燃烧性能的影响。分别在合肥（99.8kPa）和拉萨（66.5kPa）进行了不同立面倾斜结构下FPU火焰向下蔓延过程的对比实验。研究了燃烧速率（即质量损失速率）、火焰传播速度和火焰高度等特征参数。首先，形态学实验结果表明，在减压条件下，燃烧较慢，较宽的试样表现出更渐进的火焰传播。其次，在部分熔融流动燃烧条件下，观察到了一个倒V形的蔓延热解前缘，发现了窄FPU板的“两端”燃烧行为，这对实际的火灾救援技术至关重要。第三，提出了燃烧速率与压力的幂律关系，其指数范围为0.61 ~ 1.39，这可以用经典理论来解释。此外，增加立面倾角显着提高火焰传播速度，抑制了压力的影响，在大倾角。火焰温度被测量为在较低的压力下增加，导致更快的火焰膨胀。最后，确定了由火焰高度与压力得到的压力指数值与倾角之间的线性关系。
Experimental and theoretical investigations are conducted to analyze the influences of low atmospheric pressure on burning behavior of building facade insulation material flexible polyurethane (FPU). Comparison experiments for downward flame spread process over FPU under various facade inclined structures were performed at Hefei (99.8 kPa) and Lhasa (66.5 kPa), respectively. Characteristic parameters including burning rate (i.e. mass loss rate), flame spread velocity and flame height were studied in this paper. Firstly, morphological experimental results exhibited that the combustion was slower in reduced pressure condition and wider specimens showed more gradual flame spreading. Secondly, an inverted V-shaped spreading pyrolysis front was observed, and a “two-terminal” combustion behavior was found for narrow FPU board by partial molten flow combustion, which is critical to practical fire rescue techniques. Thirdly, power-law progressions of burning rate vs. pressure was proposed with an exponent ranging from 0.61 to 1.39, which can be illustrated by utilizing classical theory for sub-atmospheric pressure pool fire. Further, the increasing facade inclination angle significantly enhanced the flame spreading velocity, which suppressed the effect of pressure at high inclination angles. The flame temperature was measured to be increased at the lower pressure causing faster flame puffing. Finally, a linear relationship was determined between the pressure index values obtained by flame height vs. pressure and the inclination angle.
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影响因子：
4.4
作者：
B. Cetegen;T. A. Ahmed
通讯作者：
B. Cetegen;T. A. Ahmed
影响因子：
10.4
作者：
An, Weiguang;Wang, Zhe;Liew, K. M.
通讯作者：
Liew, K. M.
DOI：
10.1016/j.ijheatmasstransfer.2013.01.066
发表时间：
2013-06
影响因子：
5.2
作者：
Junhui Gong;Xiaodong Zhou;Zhihua Deng;Lizhong Yang
通讯作者：
Junhui Gong;Xiaodong Zhou;Zhihua Deng;Lizhong Yang
影响因子：
1.9
作者：
Mingchun Luo
通讯作者：
Mingchun Luo
影响因子：
1.9
作者：
J. Quintiere;M. Harkleroad;Y. Hasemi
通讯作者：
J. Quintiere;M. Harkleroad;Y. Hasemi