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Large Eddy Simulation of the PRECCINSTA burner

机译:PRECCINSTA燃烧器的大涡模拟

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摘要

For the first time the Reaction-Diffusion Manifold (REDIM) technique is implemented together with a presumed Filtered Density Function (FDF) to carry out Urge Eddy Simulation (LES) of lean premixed swirling flames in the well-known PRECCINSTA burner. The REDIM approach reduces detailed chemical kinetics based on low-dimensional reaction-diffusion manifolds in composition space, so that many species can be accurately estimated at a relatively low computational cost via a look-up table. In the present work, only one reduced coordinate, the CO_2 mass fraction, is considered in the REDIM look-up table. Implementation of the REDIM/FDF model is performed with two presumed FDF shapes, top-hat and clipped Gaussian. Two premixed flames are simulated, with equivalence ratios 0.75 and 0.83, respectively. Velocity, temperature and species concentration profiles are discussed and compared to the experimental data. The results are in good overall agreement with the corresponding experiment. It is also shown that the LES results obtained with the two presumed FDFs are very similar and the reason for this is analysed.
机译:这是第一次将反应扩散歧管(REDIM)技术与假定的过滤密度函数(FDF)一起实施,以在著名的PRECCINSTA燃烧器中进行稀薄的预混旋流火焰的Urge Eddy模拟(LES)。 REDIM方法基于组成空间中的低维反应扩散流形降低了详细的化学动力学,因此可以通过查找表以相对较低的计算成本来准确估计许多物种。在当前工作中,REDIM查找表中仅考虑了一个简化的坐标,即CO_2质量分数。 REDIM / FDF模型的实现是使用两个假定的FDF形状(高顶礼帽和修剪高斯型)执行的。模拟了两个预混火焰,当量比分别为0.75和0.83。讨论了速度,温度和物质浓度曲线,并与实验数据进行了比较。结果与相应的实验总体吻合良好。还表明,使用两个假定的FDF获得的LES结果非常相似,并分析了其原因。

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