论文部分内容阅读
采用基于释热率构造火焰面探测函数的动态全增厚火焰模型,结合全可压缩大涡模拟方法,对甲烷/空气同轴射流燃烧器的非预混燃烧进行模拟。将此计算结果与动态增厚火焰模型、稳态层流小火焰模型的计算结果及实验值进行比较。结果表明,前两者能够准确捕捉到燃烧器进口前的抬升火焰。动态全增厚火焰模型预测的混合分数、燃烧产物和一氧化碳的分布与实验值非常吻合,且该模型可捕捉到燃烧的全部火焰面。
In this paper, a dynamic full thickened flame model based on the detection rate of the heat release rate and a fully-compressible large eddy simulation method are used to simulate the non-premixed combustion of a methane / air coaxial jet burner. The calculated results are compared with the dynamic thickening flame model and the steady-state laminar flame model. The results show that the first two can accurately capture the ascending flame before the burner inlet. The predicted mixing fraction, combustion products and carbon monoxide distribution in the dynamic full-thickness flame model are in good agreement with experimental values, and the model captures the entire flamed surface of the combustion.