The local heat-release rate and the thermo-chemical state of laminar methane and dimethyl ether flames in a side-wall quenching configuration are analyzed. Both, detailed chemistry simulations and reduced chemistry manifolds, namely Flamelet-Generated Manifolds (FGM), Quenching Flamelet-generated Manifolds (QFM) and Reaction-Diffusion Manifolds (REDIM), are compared to experimental data of local heat-release rate imaging of the lab-scale side-wall quenching burner at Technical University of Darmstadt. To enable a direct comparison between the measurements and the numerical simulations, the measurement signals are computed in all numerical approaches. Considering experimental uncertainties, the detailed chemistry simulations show a reasonable agreement with the experimental heat-release rate. The comparison of the FGM, QFM and REDIM with the detailed simulations shows the high prediction quality of the chemistry manifolds. For the first time, the thermo-chemical state during quenching of a dimethyl ether-air flame is examined numerically. Therefore, the carbon monoxide and temperature predictions are analyzed in the vicinity of the wall. The obtained results are consistent with previous studies for methane- air flames and extend these findings to more complex oxygenated fuels. Furthermore, this work presents the first comparison of the QFM and the REDIM in a side-wall quenching burner.

中文翻译：

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层流甲烷和二甲醚火焰侧壁淬火局部放热率和热化学状态的数值研究

分析了侧壁淬火配置中层流甲烷和二甲醚火焰的局部放热速率和热化学状态。详细的化学模拟和简化的化学流形，即 Flamelet 生成的流形 (FGM)、淬火 Flamelet 生成的流形 (QFM) 和反应扩散流形 (REDIM)，都与局部热释放率成像的实验数据进行了比较达姆施塔特技术大学的实验室规模侧壁淬火燃烧器。为了能够在测量值和数值模拟之间进行直接比较，所有数值方法都计算了测量信号。考虑到实验的不确定性，详细的化学模拟显示出与实验放热率的合理一致性。FGM的比较，带有详细模拟的 QFM 和 REDIM 显示了化学流形的高预测质量。首次对二甲醚-空气火焰淬火过程中的热化学状态进行了数值研究。因此，在壁附近分析一氧化碳和温度预测。获得的结果与之前对甲烷-空气火焰的研究一致，并将这些发现扩展到更复杂的含氧燃料。此外，这项工作首次比较了侧壁淬火燃烧器中的 QFM 和 REDIM。在墙附近分析一氧化碳和温度预测。获得的结果与之前对甲烷-空气火焰的研究一致，并将这些发现扩展到更复杂的含氧燃料。此外，这项工作首次比较了侧壁淬火燃烧器中的 QFM 和 REDIM。分析墙附近的一氧化碳和温度预测。获得的结果与之前对甲烷-空气火焰的研究一致，并将这些发现扩展到更复杂的含氧燃料。此外，这项工作首次比较了侧壁淬火燃烧器中的 QFM 和 REDIM。