基于简化反应机理的甲烷-空气爆炸增厚火焰大涡模拟

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.