Heat transfer mechanisms in horizontal flame spread over wood and extruded polystyrene surfaces
Heat transfer mechanisms in horizontal flame spread over wood and extruded polystyrene surfaces
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水平火焰在木材和挤塑聚苯乙烯表面传播的传热机制
DOI：
10.1016/j.ijheatmasstransfer.2013.01.069
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发表时间：
2013-06
影响因子：
5.2
通讯作者：
Chen, X. F.
中科院分区：
文献类型：
--
作者：
Zhang, Y.;Sun, J. H.;Huang, X. J.;Chen, X. F.
在两种不同海拔条件（拉萨高原3658m和合肥平原50m）下，对建筑材料表面水平火焰传播的传热进行了实验研究。实验使用炭化材料 Whitewood 和热塑性材料挤塑聚苯乙烯 (XPS) 在各种样品宽度上进行。测量固相的温度分布。从 XPS 和 Whitewood 的温度曲线中发现了不同的火焰蔓延行为。 XPS 在预热阶段经历熔化阶段，而白木在热解阶段后经历炭燃烧阶段。传热分析表明，对于白木和 XPS，气相传热占主导地位，尽管 XPS 的热厚度较大。测量了不同样品宽度的火焰蔓延速率和表面热通量。随着样本宽度的增加，它们均先下降后上升。此外，铺展率与伪特性Ф相关，它是表面热通量和预热长度的乘积。扩散率和Ф之间存在良好的线性关系，这与Quintiere的模型非常吻合。此外，样品宽度对火焰蔓延速率的影响可以通过对传热的影响得到很好的解释。随样品宽度的水平火焰蔓延行为由两种不同的状态决定：在对流状态下，小样品宽度的扩散率下降，但在辐射状态下，大样品宽度的扩散率上升。
The heat transfer in horizontal flame spreading over the surface of construction materials was experimentally investigated at two different altitude conditions (the Lhasa plateau 3658m, and the Hefei Plain, 50m). The experiments were carried out with the charring material Whitewood and the thermoplastic material the extruded polystyrene (XPS) over a wide range of sample widths. The temperature profile in solid phase was measured. Different flame spread behaviors were found from the temperature profiles of the XPS and Whitewood. The XPS undergoes the melting stage in the preheated stage while the Whitewood undergoes the char burning stage after the pyrolysis stage. The heat transfer analysis suggests that the gas phase heat transfer is dominant for whitewood and XPS, even though the XPS is thermally thick. The flame spread rate and the surface heat flux with various sample widths were measured. They both dropped firstly and then rose with the increasing sample width. Furthermore, the spread rate was correlated with a pseudo-property Ф, which is the product of the surface heat flux and the preheated length. A good linear relationship was found between the spread rate and Ф, which agrees well with Quintiere’s model. Moreover, the sample width effects on flame spread rate were well explained by the effects on heat transfer. The horizontal flame spread behaviors with sample width were dominated by two different regimes: the spread rate drops for small sample width in convection regime but rises for large sample width in radiation regime.
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影响因子：
3.1
作者：
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通讯作者：
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