二阶矩湍流燃烧模型的考虑浮力的DNS及LES检验

DNS WITH BUOYANCY FORCE AND LES VALIDATION OF THE SECOND ORDER MOMENT TURBULENT COMBUSTION MODEL

本文用谱方法对考虑浮力的三维槽道湍流反应流动进行了直接模拟,用直接模拟统计结果对二阶矩亚网格湍流燃烧模型(SOM-SGS)进行了检验,结果显示SOM-SGS模型具有合理性。进一步用SOM-SGS模型成功预报了甲烷-空气射流火焰,其统计结果显示了RANS模拟中代数SOM燃烧模型的合理性。

The direct numerical simulation （DNS） of three-dimensional channel turbulent reacting flows with buoyancy force using a spectral method was carried out. The statistical DNS results are used to validate the second order moment sub-grid scale （SOM-SGS） turbulent combustion model. The results show that the SOM-SGS model is reasonable. Furthermore, a methane air jet flame was simulated by large eddy simulation （LES） using the SOM-SGS model. Additionally the LES statistical results show the reasonability of the RANS algebra SOM （ASOM） combustion model.