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为研究旋流火焰结构,采用二阶矩亚网格(SOM-SGS)燃烧模型及Smagorinsky-Lilly和K方程亚网格湍流模型,对美国Sandia国家实验室测量的旋流火焰进行了大涡模拟,得到了与燃烧场速度、温度和温度脉动实测值相吻合的模拟结果。预报的瞬时温度分布云图与实际火焰的形状很相似。K方程亚网格湍流模型预报的瞬时温度分布比Smagorinsky-Lilly模型的预报结果更接近实际。燃烧火焰基本上位于回流区所在的位置,火焰在回流区被稳定。
In order to study the swirling flame structure, the SOM-SGS combustion model and Smagorinsky-Lilly and K equation sub-grid turbulence model were used to simulate the swirling flame measured by the Sandia National Laboratory in USA. The simulation results agreeing with the measured values of combustion field velocity, temperature and temperature were obtained. The predicted instantaneous temperature profile is very similar to the actual flame shape. The instantaneous temperature distribution of the sub-grid turbulence model of K equation is more realistic than that of the Smagorinsky-Lilly model. The combustion flame is basically located in the reflow zone where the flame is stabilized in the reflow zone.