为研究燃气轮机模型燃烧室的非预混燃烧流场，采用大涡模拟方法分别结合火焰面生成流形模型（FGM）和部分预混稳态火焰面模型（PSFM）对甲烷/空气同轴射流非预混燃烧室开展了数值模拟研究，并与试验结果进行对比。结果表明：FGM所预测的速度分布、混合分数分布、燃烧产物及CO分布与试验结果更符合；两种模型均能捕捉到燃烧室中的火焰抬举现象；燃烧过程中的火焰结构较为复杂，同时存在预混燃烧区域和扩散燃烧区域，扩散燃烧主要分布在化学恰当比等值线附近，预混燃烧区域主要分布在贫油区。

In order to study nonpremixed combustion flow field of gas turbine model combustors, large eddy simulations (LES) of a methane/air coaxial jet nonpremixed combustor were performed coupled with flamelet generated manifolds (FGM) model and partially premixed steady flamelet model (PSFM) respectively, and the LES results were compared with experimental data. The results show that the results of FGM model such as velocity profiles, mixture fraction profiles, combustion product and CO mass fraction profiles agree better with experimental data; two models can both capture the liftoff flame phenomenon in the combustor; the structure of the flame is complicated, in which premixed combustion and diffusion combustion coexist, and diffusion flames are mostly around stoichiometric isolines while premixed flames are mainly in lean regions.

V231.2

国家科技重大专项（2017-III-0006-0031)；国家自然科学基金（91741118）