A numerical simulation of a bluff-body stabilized nonpremixed flame has been performed with second-moment turbulence closure(SMTC) models.To clarify the applicability of the existing-SMTC models in this complex flame, several typical SMTC models ,including LRR-IP model, JM model,SSC model as well as two modified LRR-IP mode, have been applied and evaluated in the numerical simulation of a bluff-body flame. Some of the above-mentioned SMTC models cannot provide overall satisfactory predictions for this challenging test. The difference in performance between the various SMTC models is quite significant. In the present study, the equilibrium chemistry model is employed and an assumed-shape beta function PDF approach is used to represent the interaction between turbulence and chemistry. It can be concluded that the modified LRR-IP models as well as SSG model are superior to other SMTC models in the turbulent nonpremixed bluff-body stabilized flame.%应用二阶矩封闭湍流模型进行了湍流非预混钝体稳定火焰数值模拟的研究.应用LRR-IP模型,JM模型,SSG模型以及两个修正后的LRR-IP模型等二阶矩封闭湍流模型,进行了钝体稳定火焰数值模拟的研究.对于复杂的钝体稳定火焰,一些模型无法给出令人满意的结果,而且不同模型的结果差异很大.在研究中,湍流燃烧模型采用了化学平衡模型和假设PDF模型.研究结果表明,对于钝体稳定火焰,SSG模型以及两个修正后的LRR-IP模型要优于其他几个二阶矩封闭湍流模型.
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