Abstract

In this paper, the so-called REDIM–DTF sub-grid scale combustion model is proposed to improve the well-known dynamically thickened flame (DTF) combustion model by combining the DTF modeling strategy with the reaction-diffusion manifold (REDIM) chemistry table, which is generated from a detailed reaction mechanism. The new model is then used to calculate two lean premixed swirling flames in the PRECCINSTA combustor via large eddy simulation. The radial profiles of velocity, temperature, and species concentration, as well as the flame surface area and vortex structure are analyzed. The results are in good overall agreement with the corresponding experiment, and the performance of the REDIM–DTF model is very similar to that of the DTF model. The predicted CO mass fraction profiles, however, show a relatively larger discrepancy between the original DTF model and the proposed REDIM–DTF model, which is thought to be due to different reaction mechanisms used. As a smaller number of species transport equations are solved in the REDIM–DTF model, its computational efficiency is about 15% higher than that of the original DTF model.

中文翻译：

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通过REDIM化学表的动态增厚火焰模型耦合对稀薄预混旋流的大涡模拟

摘要

本文提出了所谓的REDIM–DTF亚网格规模燃烧模型，以通过结合DTF建模策略和反应扩散歧管（REDIM）化学表来改进著名的动态加厚火焰（DTF）燃烧模型。 ，这是通过详细的反应机制生成的。然后，通过大涡流模拟，将新模型用于计算PRECCINSTA燃烧室中的两个稀薄预混旋流火焰。分析了速度，温度和物质浓度的径向分布，以及火焰表面积和涡旋结构。结果与相应的实验总体吻合良好，并且REDIM–DTF模型的性能与DTF模型的性能非常相似。但是，预测的CO质量分数分布 显示原始DTF模型与建议的REDIM–DTF模型之间的相对较大差异，这被认为是由于使用了不同的反应机制。由于在REDIM–DTF模型中求解的物种迁移方程数量较少，因此其计算效率比原始DTF模型高约15％。