基于ESF和FGM的湍流预混火焰大涡模拟  

Large Eddy Simulations of Turbulent Premixed Flame Using ESF Model Coupled with FGM Model

作　　者：章严 于洲[2] 王浒[1] 尧命发[1] Zhang Yan;Yu Zhou;Wang Hu;Yao Mingfa(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;Department of Thermal Science and Energy Engineering,University of Science and Technology of China,Hefei 230027,China)

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]中国科学技术大学热科学和能源工程系,安徽合肥230027

出　　处：《内燃机学报》2020年第6期514-521,共8页Transactions of Csice

基　　金：国家重点研发计划资助项目(2017YFE0102800);国家自然科学基金资助项目(51876140).

摘　　要：为了进一步发展适用于湍流预混火焰的亚格子燃烧模型,将欧拉随机场(ESF)模型与火焰面生成流形(FGM)模型耦合以发挥不同模型的优点.耦合模型通过混合物分数及反应进度变量构建低维流形,而湍流场中两者的概率密度分布函数(PDF)则通过ESF确定.通过对旋流燃烧器进行大涡模拟,以评估耦合模型描述湍流预混火焰结构的能力.结果表明:相比于传统FGM模型,耦合模型可以更好地预测湍流预混火焰中的速度、温度及组分的空间分布.由瞬时云图可知,耦合模型可以更加准确地描述当地火焰结构,尤其在火焰下游区域.可以推断耦合模型能够更好地保证湍流预混火焰的传播特性.In order to develop the subgrid scale combustion model for turbulent premixed flames,the Eulerian stochastic field(ESF)model was coupled with the flamelet generated manifold(FGM)model to combine their advantages.The combined model constructed low-dimensional manifold by mixture fraction and reaction progress variable,while the joint probability density function(PDF)of them were evaluated by ESF.In order to evaluate the ability of the combined model to describe the structure of turbulent premixed flame,large eddy simulation was carried out for swirl burner.The simulation results show that the combined model can better predict the velocity,temperature and the spatial distribution of components in turbulent premixed flames than the traditional FGM model.It can be seen from the instantaneous contours that the combined model can describe the local flame structure more accurately,especially in the downstream region of the flame.It can be concluded that the combined model can better guarantee the propagation characteristics of turbulent premixed flames.

关 键 词：湍流预混火焰 欧拉随机场模型 火焰面生成流形模型 大涡模拟 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]