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Journal of Tsinghua University(Science and Technology)    2020, Vol. 60 Issue (12) : 1039-1046     DOI: 10.16511/j.cnki.qhdxxb.2020.21.013
Physics and Engineering Mechanics |
Numerical simulation of opposed-flow flame spread of PMMA with melting mushy zone
Shengfeng LUO1,Qiyuan XIE2,*(),Hui ZHANG1,*(),Guangjian WANG3
1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China
2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China
3. School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
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Abstract  

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.

Keywords polymethyl methacrylate (PMMA)      flame spread      numerical simulation      melt transition     
Corresponding Authors: Qiyuan XIE,Hui ZHANG     E-mail: xqy@ustc.edu.cn;zhhui@tsinghua.edu.cn
Issue Date: 14 October 2020
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Shengfeng LUO
Qiyuan XIE
Hui ZHANG
Guangjian WANG
Cite this article:   
Shengfeng LUO,Qiyuan XIE,Hui ZHANG, et al. Numerical simulation of opposed-flow flame spread of PMMA with melting mushy zone[J]. Journal of Tsinghua University(Science and Technology), 2020, 60(12): 1039-1046.
URL:  
http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2020.21.013     OR     http://jst.tsinghuajournals.com/EN/Y2020/V60/I12/1039
  
10.16511/j.cnki.qhdxxb.2020.21.013.T001

模型主要物性参数

参数 数值
固相导热系数ks/(W·m-1·K-1) 0.2
固相密度ρs/(kg·m-3) 1 190
液相导热系数kl/(W·m-1·K-1) 0.36
固相线温度Ts/K 440
热解活化能Ec/(J·mol-1) 129 872.9
气体导热系数kg/(W·m-1·K-1) 0.041 1
热解反应热qc/(J·kg-1) 9.41×105
燃烧热qg/(J·kg-1) -2.59×107
初始氧质量分数Yo, ∞ 0.3
可燃气反应当量比uf 1
PMMA比热容Cps/(J·kg-1·K-1) 1 460
液相密度ρl/(kg·m-3) 1 500
液相线温度Tl/K 500
热解指前因子Ac/(J·mol-1) 2.82×109
渗透系数Ke 0.95
气体比热容Cpg/(J·kg-1·K-1) 1 007
初始温度T∞/K 300
发射系数ε 0.84
氧气反应当量比uo 4
  
  
  
  
  
  
  
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