Numerical simulation of opposed-flow flame spread of PMMA with melting mushy zone

被引：0
|
作者：
Luo S. [1 ]
Xie Q. [2 ]
Zhang H. [1 ]
Wang G. [3 ]
机构：
[1] Department of Engineering Physics, Tsinghua University, Beijing
[2] State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei
[3] School of Aerospace Engineering, Tsinghua University, Beijing
来源：
Qinghua Daxue Xuebao/Journal of Tsinghua University | 2020年 / 60卷 / 12期
关键词：
Flame spread; Melt transition; Numerical simulation; Polymethyl methacrylate (PMMA);
D O I：
10.16511/j.cnki.qhdxxb.2020.21.013
中图分类号：
O63 [高分子化学（高聚物）]; TQ31 [高分子化合物工业（高聚物工业）];
学科分类号：
070305 ; 0805 ; 080501 ; 080502 ; 081704 ;
摘要：
The opposed-flow flame spreading along a polymethyl methacrylate (PMMA) sheet was investigated numerically. The melting process included a mushy transition region in the energy equation during the flame spreading. The fuel was ignited by applying a fixed heat flow at one position on the upper boundary of the material. The results show the typical procedures of ignition followed by unstable to stable flame spreading. The morphology of the mushy zone and the molten phase thickness were obtained based on the temperature field. The results show that the mushy zone is thin near the flame front and gradually thickens downstream of the flame front. Additionally, the melt region is shallow near the flame front and gradually deepens with increasing the distance from the flame front. The numerical results and a scale analysis show that the melt interface location can be approximated by a quadratic function. © 2020, Tsinghua University Press. All right reserved.
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页码：1039 / 1046
页数：7
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