Abstract
This study aims to investigates the influence of sinusoidal-shaped walls in meso-scale reactors on the flame stabilization mechanisms and combustion characteristics of fuel-lean methane/air mixtures, utilizing a numerical model coupled with hetero-/homogeneous reaction mechanisms. We conducted comprehensive numerical simulations, comparing them with experimental results for ignition position and the mole fraction of OH radical. Maximum deviations were around 4.7 % and 6.7 %, respectively, ensuring numerical model reliability. Results of the study support understanding of different sinusoidal wall configurations, catalyst segmentation coating, and operating conditions on flame stability and combustion performance. When the amplitude A ≥ 1.5 mm, wavelength t ≤ 37.68 mm, the sinusoidal-shaped wall and catalyst segmentation coating demonstrated remarkable efficiency in stabilizing flames by minimizing the competition between homogeneous and heterogeneous reactions while prolonging the residence time of reactants in the reactors. Furthermore, this reactor exhibits outstanding stability in high-velocity, high-pressure conditions. However, under these conditions, the system may reduce the reactor’s inner temperature, and causing significant temperature fluctuations.
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