文章基本信息

标题：Influence of U-shaped structure on upward flame spread and heat transfer behaviors of PMMA used in building thermal engineering
其他标题：Influence of U-shaped structure on upward flame spread and heat transfer behaviors of PMMA used in building thermal engineering
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作者：Weiguang An ; Xiangwei Yin ; Minglun Cai 等
期刊名称：Case Studies in Thermal Engineering
印刷版ISSN：2214-157X
电子版ISSN：2214-157X
出版年度：2020
卷号：22
页码：100794
DOI：10.1016/j.csite.2020.100794
出版社：Elsevier B.V.
摘要：Both experimental and theoretical study on upward flame spread and heat transfer behaviors of PMMA (polymethyl methacrylate) under different U-shaped structure factors ( Π ) was conducted. The main results are as follows. The progress of pyrolysis front is used to determine flame spread rate since the flame front is more fluctuating than pyrolysis front. The flame spread rate is stable for 30 cm-length PMMA in this work. For Π < 1 , the flame spread rate increases as Π rises. For Π ≥ 1 , the flame spread rate tends to be stable. Based on heat transfer analysis, two models are established to predict flame spread rates with different Π for laminar and turbulent flame, respectively. Compared with experimental results, the prediction error is lower than 9%, within acceptable range of engineering. The prediction accuracy of the present model is better than that of previous model. In addition, theoretical correlation between the flame height and pyrolysis length is x f = 1.639 x p . Predicted flame heights are basically consistent with experimental results when Π = 0.4 or Π = 1.6. This work is beneficial for safety evaluation and optimization design of building thermal engineering using PMMA.
关键词：Building thermal engineering ; U-shaped structure ; PMMA ; Heat transfer ; Flame spread rate ; Flame height