Large eddy simulation on methane-air explosion using thickened flame model coupled with reduced reaction mechanism

doi:10.11949/0438-1157.20210843

Abstract

Abstract:

Based on the simplified single-step reaction mechanism, this paper uses the thickened flame model to carry out the large eddy simulation of the methane-air explosion in the pipeline, and analyzes the influence of the two flame detection functions proposed by Légier (TF1) and Durand (TF2) on the simulation results. The results show that LES can accurately predict the tulip shaped flame and the corresponding characterize time during the flame propagation process. Although the flame speed and pressure predicted by the two flame sensors are basically consistent with the experimental results, the predicted value of TF2 is more accurate. The efficiency function is not affected by the flame sensor. In general, the flame thickening is more pronounced with TF1.

Key words: methane, explosions, thickening flame, numerical simulation, flame speed and pressure

摘要：

基于简化的单步反应机理，采用增厚火焰模型开展了管道内甲烷-空气爆炸大涡模拟，分析了Légier （TF1）与Durand （TF2）提出的两种火焰探测函数对模拟结果的影响。结果表明，大涡模拟能够精确预测管道内火焰传播过程中出现的郁金香形状与形成特征时间。尽管两种探测函数的火焰传播速度与超压的大涡模拟结果与实验基本一致，但TF2预测值更加精确。火焰探测函数对效率因子变化基本上没有影响，TF1对火焰的增厚效应要强于TF2。

关键词: 甲烷, 爆炸, 增厚火焰, 数值模拟, 火焰速度与压力

CLC Number:

X 932

Kai ZHENG, Juncheng JIANG, Zhixiang XING, Fan WU, Jie WU, Minggao YU. Large eddy simulation on methane-air explosion using thickened flame model coupled with reduced reaction mechanism[J]. CIESC Journal, 2021, 72(11): 5867-5874.

郑凯, 蒋军成, 邢志祥, 吴凡, 吴洁, 余明高. 基于简化反应机理的甲烷-空气爆炸增厚火焰大涡模拟[J]. 化工学报, 2021, 72(11): 5867-5874.

Figures/Tables 6

Table 1 Rate constants for the one step mechanism

A/(m³?kmol^-1?s^-1)	$n^{C H_{4}}$	$n^{O_{2}}$	$E_{a}$ /(J?mol^-1)
3.478505×10⁸	1.0	0.5	8.368×10⁷

Table 1 Rate constants for the one step mechanism

A/(m³?kmol^-1?s^-1)	$n^{C H_{4}}$	$n^{O_{2}}$	$E_{a}$ /(J?mol^-1)
3.478505×10⁸	1.0	0.5	8.368×10⁷

Fig.1 2D-slices of the temperature field at different instants during the tulip shaped flame formation

Fig.2 3D iso-surface by temperature of 1200 K and flow field with TF1 at different instants

Fig.3 The time curves of flame speed

Fig.4 The time curves of pressure

Fig.5 Instantaneous 2D-slices of Ω, F, Ξ and Ξ×F at instant about 39 ms

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