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对一个值班湍流CH4 O2 N2射流扩散火焰(SandiaFlameD)进行了数值模拟研究.所采用的数学物理模型包括双尺度的k-ε湍流模型,标量联合的概率密度函数(PDF)输运方程方法,甲烷氧化的ARM简化化学反应机理(包含16种组分,12步总包反应)和欧几里德最小生成树(EMST)小尺度混合模型.将计算结果和实验数据进行了比较,不仅对于平均量,对于标量的散点分布和条件概率密度分布也是如此.计算结果表明文中采用的模型不仅能够预测宏观的火焰结构,而且预测了湍流燃烧中复杂的局部熄火和再燃过程.
A numerical simulation of a turbulent CH4 O2 N2 jet diffusive flame (SandiaFlameD) was conducted.The mathematical models used included two-scale k-ε turbulence model, a scalar combined probability density function (PDF) transport equation method, a methane Oxidized ARM simplified chemical reaction mechanism (including 16 components, 12-step total package reaction) and Euclidean minimum spanning tree (EMST) small-scale mixed model.Compared with the experimental data, the calculation results not only for the average As well as the scatter distribution and the conditional probability density distribution of scalar.The results show that the model used in this paper can not only predict macroscopic flame structure but also predict the complicated local flameout and reburning process in turbulent combustion.