对低旋燃烧器内的流动和燃烧进行了大涡模拟,其中化学反应分别采用传统的扩散小火焰模型和所提出的复合小火焰模型描述。复合小火焰模型借助于燃烧区索引的概念区分当地的燃烧模式,若当地的燃烧为扩散燃烧,则调用扩散小火焰库,否则调用预混小火焰库。数值结果与实验数据的对比表明,采用大涡模拟方法结合小火焰模型能够很好地模拟实验室尺度的低旋燃烧器,且采用复合小火焰模型能够得到更加符合实际的结果。 Large-eddy simulation of flow and combustion in a low-spin combustor was performed, in which the chemical reaction was described using the conventional diffusion flamelet model and the proposed composite flamelet model, respectively. The composite flame model distinguishes the local combustion mode by means of the concept of the index of the combustion section. If the local combustion is diffusion combustion, the diffusion small flame bank is invoked, otherwise the premixed small flame bank is invoked. The comparison of numerical results with experimental data shows that the large eddy simulation method combined with the small flame model can well simulate the laboratory scale low-spin burner, and the composite small flame model can be more realistic results.