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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Numerical study of the flame stability of premixed methane-air combustion in a combined porous-free flame burner
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Numerical study of the flame stability of premixed methane-air combustion in a combined porous-free flame burner

机译：复合无孔火焰燃烧器中甲烷-空气混合燃烧火焰稳定性的数值研究

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摘要

Premixed methane-air combustion process within a combined porous-free flame burner was investigated numerically in the present study. The burner consisted of a perforated porous ceramic pellet forming combination of submerged and free flame zones. Nonequilibrium thermal condition between the gas and solid phases was implemented and governing equations were solved in a two-dimensional model using finite volume method. Detailed chemistry based on reduced GRI 3.0 mechanism with 41 reaction steps and 16 species including NOx mechanisms was utilized to simulate the combustion processes and pollutant emissions. In order to investigate the validation of the implemented numerical model, the burner was manufactured and tested. The predicted results were consistent with the experimental data. Comparison of the combined porous-free flame burner with porous burner showed that the flame stability limits of the combined burner were higher than those of porous burner. Multimode heat transfer within the porous medium was perused and the effect of heat recirculation on the flame stabilization was discussed. Investigation of the effect of pore density on the flame stabilization showed that the lower pore densities were desirable in order to improve the flame stability limits. Pollutant emission analysis proved that the NO concentration increased with increasing the equivalence ratio while the minimum quantity of CO concentration was evaluated at an equivalence ratio of 0.6.
机译：在本研究中，对复合无孔火焰燃烧器内的甲烷-空气预混合燃烧过程进行了数值研究。燃烧器由穿孔的多孔陶瓷颗粒组成，该颗粒形成浸没和自由火焰区的组合。实现了汽相和固相之间的非平衡热条件，并使用有限体积法在二维模型中求解了控制方程。基于还原的GRI 3.0机理，41个反应步骤和16种物质（包括NOx机理）的详细化学用于模拟燃烧过程和污染物排放。为了研究所实施数值模型的有效性，制造并测试了燃烧器。预测结果与实验数据一致。无孔组合火焰燃烧器与多孔燃烧器的比较表明，组合燃烧器的火焰稳定性极限高于多孔燃烧器。仔细研究了多孔介质内的多模传热，并讨论了热循环对火焰稳定的影响。对孔密度对火焰稳定性的影响的研究表明，为了提高火焰稳定性极限，需要较低的孔密度。污染物排放分析表明，当量比增加时，NO浓度增加，而当量比为0.6时，评估最低的CO浓度。

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