A joint numerical study of multi-regime turbulent combustion
A joint numerical study of multi-regime turbulent combustion
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多流态湍流燃烧联合数值研究
DOI：
10.1016/j.jaecs.2023.100221
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发表时间：
2023
影响因子：
--
通讯作者：
Fiorina B
中科院分区：
文献类型：
--
作者：
Fiorina B
本文对多区燃烧器结构进行了联合数值研究。燃烧器设计由三个同心入口流组成，其可以以不同的当量比独立地操作，允许以不同的燃烧状态（包括预混、非预混和多状态火焰区）为特征的分层火焰的操作。基于不同的数值方法，在三个LES求解器上进行了模拟。燃烧动力学的简化采用列表或简化化学方法。最后，采用不同的湍流燃烧建模策略，包括几何，统计和反应器为基础的方法。由于模拟参数的这种显著分散，不可能得出关于特定燃烧模型性能的结论。然而，在数值模拟中涉及的10个数值组，进行粗略的统计分析：计算数值模拟的平均值和标准差，并与实验进行比较。因此，这一联合数值研究部分说明了该社区对湍流燃烧建模的能力。这个练习给出了当前模拟的平均性能，并识别了大多数建模策略无法很好地捕捉的物理现象。在不同的轴向位置沿着径向剖面的实验和数值数据之间的详细比较表明，温度场是相当不错的捕捉到60毫米从燃烧器出口。然而，比较显示，关于CO质量分数的预测显着的差异。三个原因可以解释这种现象。第一个原因是一氧化碳对详细化学的简化具有更高的敏感性，特别是当遇到多个燃烧状态时。第二个是人工增稠引入的偏差，它高估了物种的大量生产率。这种行为已经说明了制造平均增厚湍流火焰刷从随机位移的1-D层流火焰解决方案。最后一个是亚网格尺度的火焰湍流对过滤化学火焰结构的影响，这可能是具有挑战性的模型。
This article presents a joint numerical study on the Multi Regime Burner configuration. The burner design consists of three concentric inlet streams, which can be operated independently with different equivalence ratios, allowing the operation of stratified flames characterized by different combustion regimes, including premixed, non-premixed, and multi-regime flame zones. Simulations were performed on three LES solvers based on different numerical methods. Combustion kinetics were simplified by using tabulated or reduced chemistry methods. Finally, different turbulent combustion modeling strategies were employed, covering geometrical, statistical, and reactor based approaches. Due to this significant scattering of simulation parameters, a conclusion on specific combustion model performance is impossible. However, with ten numerical groups involved in the numerical simulations, a rough statistical analysis is conducted: the average and the standard deviation of the numerical simulation are computed and compared against experiments. This joint numerical study is therefore a partial illustration of the community’s ability to model turbulent combustion. This exercise gives the average performance of current simulations and identifies physical phenomena not well captured today by most modeling strategies. Detailed comparisons between experimental and numerical data along radial profiles taken at different axial positions showed that the temperature field is fairly well captured up to 60 mm from the burner exit. The comparison reveals, however, significant discrepancies regarding CO mass fraction prediction. Three causes may explain this phenomenon. The first reason is the higher sensitivity of carbon monoxide to the simplification of detailed chemistry, especially when multiple combustion regimes are encountered. The second is the bias introduced by artificial thickening, which overestimates the species’ mass production rate. This behavior has been illustrated by manufacturing mean thickened turbulent flame brush from a random displacement of 1-D laminar flame solutions. The last one is the influence of the subgrid-scale flame wrinkling on the filtered chemical flame structure, which may be challenging to model.
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