简化CH4/O2/N2基元反应模型在爆轰模拟中的应用

基于改进的全耦合TVD格式和简化的基元化学反应模型，建立了二维可燃预混合气爆轰波传播过程的模型并编制了相应的CFD程序，对CH4／O2／N2预混气爆轰波的形成和传播进行了数值模拟。使用不同的计算初始条件来考察模型的计算模拟能力，计算结果表明，该模型能够精确捕捉爆轰波及其波后的反射过程，同时，也能够预测不同计算初始条件下爆轰波的传播轨迹。计算结果与相同条件下CJ爆轰理论模型的计算结果进行了比较，两者符合较好，这表明简化的CH4／O2／N2机理能够较好地应用于可燃气爆轰过程的数值计算中。

An application of reduced CH4/O2/N2 reaction mechanism on numerical simulation of detonation

Based on the modified global coupled TVD scheme and the reduced element reaction model, a two-dimensional model of detonation characteristics for premixed combustible mixture was established, and its CFD code was also written. The model was used to simulate the formation and propagation process of detonation wave for premixed CH_4/O_2/N_2 mixture in order to investigate the effect of different initial parameters on the modeling. The computational results show that the model can capture the detonation wave and its reflection accurately, and can also predict the detonation track for the different initial parameters. The computational results were compared to results calculated by CJ detonation theory. The good agreements show that reduced CH_4/O_2/N_2 reaction mechanism presented in this paper is appropriate for predicting the detonation process of premixed CH_4/O_2/N_2 mixture.