两种亚网格燃烧模型的对比研究

A Detailed Comparison Study of Two SGS Combustion Models

为详细比较动态增厚火焰模型和火焰锋面密度模型的性能,本文分别采用这两种亚网格燃烧模型对工业燃气轮机PRECCINSTA的模型燃烧室内湍流预混火焰进行了大涡模拟研究。计算结果与实验数据吻合良好,且这两种模型预测得到的速度、温度和主要组分的统计数据也非常接近。然而对于CO的分布两者的预测结果差异明显,文中对此进行了简要分析。研究还表明本文的计算结果与实验数据的吻合度与文献中报道的前期结果相比有所提高。

A detailed comparison of the performance of the dynamically thickened-fiame(DTF)model and the flame surface density(FSD) model is conducted through large eddy simulation(LES) of the turbulent lean premixed swirling flames in the well known PRECCINSTA gas turbine combustor.Very good agreement between the LES and experimental data is obtained.It shows that for predicting the statistics of velocity,temperature and major species,both the FSD model and the DTF model predict very similar results for the flames under consideration.However,for predicting the CO mass fraction the FSD model performs less good as the DTF model.The reason for this is analysed briefly.Comparison with results in the literature shows that the present LES results are slightly improved.