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中文摘要：
使用大涡模拟加稳态火焰面模型、火焰面/反应进度模型对CH_4/H_2/N_2湍流射流扩散火焰进行了模拟,通过与实验数据的详细比较对火焰面模型进行了检验。结果表明,两种火焰面模型计算得到的低阶矩与实验值都符合得较好,后者对二阶矩捕捉更准确;小组分（NO,OH）分布与实验结果都有较大偏差,直接求解小组分输运方程可得到较好结果。最后用POD技术对流场进行分解与重构,可以发现前5阶模态即占有总能量的60%左右,且中心射流区域集中了各尺度的湍流相干结构。
英文摘要：
Large eddy simulations of a turbulent CH4/H2/N2 jet diffusion flame with the steady fiamelet model or the flamelet/progress-variable approach are conducted to test these two models. Results show that both models evaluate the low-order moments well compared with the experimental data,while the latter one captures the second-order moment more accurately.Much larger deviations can be found when evaluate the minor species（NO,OH）,which can be avoided by solving the specie＇s transport equation.When analyzing the data using POD technology,facts that the first five modals occupies about 60%of the total turbulent energy and the central jet region contains various turbulent coherent structures can be found.
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