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Flame stability analysis of the premixed methane-air combustion in a two-layer porous media burner by numerical simulation

机译：数值模拟分析两层多孔介质燃烧器中甲烷-空气混合气燃烧的火焰稳定性

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The flame stabilization within a two-layer porous burner was investigated numerically in the present study. Two-dimensional model was implemented to simulate the premixed methane-air combustion process. The governing equations including the radiative transport equation and separate energy equations for the solid and gas phases were solved by using the finite volume method. In order to validate the utilized model, the gas and solid temperature profiles within the burner were compared to the experimental temperature distribution and good agreement was observed. The results proved that the stability limit and flame temperature within a porous burner can be controlled by the equivalence ratio of the incoming mixture. Heat recirculation study showed that high convective heat recirculation occurred at low equivalence ratios caused higher stable inlet velocities. The radiative recirculation efficiency was almost constant over the stability limit at constant equivalence ratio while this parameter decreased with increasing equivalence ratio. Also, the effect of outlet diameter of the burner on the flame stabilization suggested that the optimum outlet diameter eventuating the highest flame stability limit was double the amount of inlet diameter. The study of the effect of the length of first porous layer on the flame status showed that the optimum ratio of preheat zone to combustion zone length was 0.33 to reach the highest burner operating range. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在本研究中，对两层多孔燃烧器内的火焰稳定性进行了数值研究。建立了二维模型来模拟甲烷-空气预混合燃烧过程。利用有限体积法求解了固相和气相的控制方程，包括辐射输运方程和单独的能量方程。为了验证所使用的模型，将燃烧器内的气体和固体温度曲线与实验温度分布进行了比较，观察到了良好的一致性。结果证明，可通过进料混合物的当量比控制多孔燃烧器内的稳定性极限和火焰温度。热循环研究表明，在低当量比下发生高对流热循环，从而导致较高的稳定进口速度。在恒定当量比的情况下，辐射再循环效率在稳定极限范围内几乎恒定，而该参数随当量比的增加而减小。同样，燃烧器出口直径对火焰稳定性的影响表明，导致最高火焰稳定性极限的最佳出口直径是入口直径的两倍。对第一多孔层长度对火焰状态影响的研究表明，预热区与燃烧区长度的最佳比值为0.33，以达到最高的燃烧器工作范围。 （C）2017 Elsevier Ltd.保留所有权利。

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