Highly-resolved numerical simulations employing detailed reaction kinetics and molecular transport have been applied to flame-wall interaction (FWI) of laminar premixed flames. A multiple plane-jet flame (2D) has been considered, which is operated with premixed methane/air mixtures at atmospheric conditions and with different equivalence ratios. Free flame (FF) and side-wall quenching (SWQ) conditions have been accomplished by defining one lateral boundary as either a symmetry plane for FF or a cold wall with fixed temperature for SWQ. An equidistant grid with a resolution of 20 µm is used to resolve the FWI zone. The GRI-3.0 mechanism is used for computing chemical reaction rates. The flame is tangentially compressed when approaching the cold wall, and elongated in the FF case, causing an inversion of the sign of the tangential strain rate Ka_s and a considerable decrease of the total stretch rate Ka_tot for the SWQ flame. The flame consumption speed S_L decreases with decreasing normal stretch due to curvature Ka_c while approaching the cold wall, but it increases with decreasing Ka_c for the FF case, leading to an inversion of the Markstein number Ma_tot based on Ka_tot from positive in FF to negative in the SWQ case. The results reveal a strong correlation of flame dynamics during transitions from FWI to freely propagating flames, which may bring a new perspective for modeling FWI phenomena by means of flame dynamics. To do this, the quenching effect of the wall may be reproduced by an inversion of the Markstein number from positive to negative in the FWI zone and applying the general linear Markstein correlation, leading to a decrease of the flame consumption speed. In addition, the quenching distance evaluated from S_L has been found to be almost equal to the unstretched laminar flame thickness, which compares quantitatively well with measured data from literature.

使用详细的反应动力学和分子传输的高分辨率数值模拟已应用于层流预混火焰的火焰壁相互作用（FWI）。已经考虑了多平面喷气火焰（2D），该火焰在大气条件下以不同的当量比与预混合的甲烷/空气混合物一起运行。通过将一个横向边界定义为FF的对称平面或SWQ的温度固定的冷壁，已经实现了自由火焰（FF）和侧壁淬火（SWQ）条件。分辨率为20 µm的等距网格用于解析FWI区。GRI-3.0机制用于计算化学反应速率。当接近冷壁时，火焰被切向压缩，而在FF情况下，火焰被拉长，导致切向应变率的符号反转Ka _s和SWQ火焰的总拉伸率Ka _tot大大降低。火焰消耗速度S _L在接近冷壁时由于曲率Ka _c而随着法向拉伸的减小而减小，但在FF情况下，随着Ka _c的减小而增大，导致基于Ka _tot的马克斯坦数Ma _tot反转。从FF的正数到SWQ的负数。结果表明，从FWI到自由传播的火焰过渡过程中，火焰动力学具有很强的相关性，这可能为通过火焰动力学模拟FWI现象提供新的视角。为此，可通过在FWI区中将Markstein数从正值反转为负值并应用一般的线性Markstein相关性来再现壁的淬火效果，从而导致火焰消耗速度降低。另外，已经发现从S _L估计的淬火距离几乎等于未拉伸的层流火焰厚度，其定量地与文献中的测量数据进行了比较。