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本文发展了一种基于有限反应速率的湍流燃烧大涡模拟方法。基于此方法,对常压下,甲烷/空气平板射流扩散燃烧进行了大涡模拟.甲烷/氧气反应采用包含七种组分的四步反应简化反应机理,考虑了基于Arrienius定律的有限化学反应速率,瞬态结果和时均结果与DNS结果都符合很好。为了解决考虑有限反应速率后计算量急剧增加的问题,本文引入等效化学反应速率模型,在压力泊松方程的求解中采用了求解效率较高的快速傅里叶变换方法,并对整个程序进行基于区域分解的MPI并行编程处理。
In this paper, a large eddy simulation method for turbulent combustion based on the limited reaction rate has been developed. Based on this method, large-eddy simulation was carried out on methane / air plate jet combustion under atmospheric pressure.The methane / oxygen reaction was simplified by a four-step reaction consisting of seven components, taking into account the limited chemical reaction rate based on Arrienius’s law , Transient results and time-averaged results are in good agreement with DNS results. In order to solve the problem of the sharp increase of calculation after considering the limited reaction rate, an equivalent chemical reaction rate model is introduced in this paper, and the fast Fourier transform method with high efficiency is used in the solution of pressure Poisson’s equation. MPI Parallel Programming Based on Region Decomposition.