The present work implements a numerical simulation to investigate the combustion process in a porous-free flame burner. The non-equilibrium thermal condition is performed, and discretization and solving of the governing equations are conducted in a two-dimensional axisymmetric model. In order to simulate the combustion process, a reduced chemical kinetic mechanism of GRI 3.0, which includes 16 species and 41 reactions, is used. In order to prove the precision of the numerical method, some experimental tests are carried out and the numerical results are in a good agreement with the experimental measurements. The numerical results demonstrate that the porous-free flame burner has a higher flame stability compared to the conventional porous burner and the radiative efficiency of the porous-free flame burner is less than the porous burner. In addition, an increase in thermal conduction of the porous medium leads to an extension in the flame stability. In addition, the results show that with decreasing the pore density of porous medium, the flame stability is extended.

中文翻译：

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贫混合气无孔火焰燃烧器燃烧特性的数值研究

目前的工作采用数值模拟来研究无孔火焰燃烧器的燃烧过程。执行非平衡热条件，并在二维轴对称模型中进行控制方程的离散化和求解。为了模拟燃烧过程，使用了 GRI 3.0 的简化化学动力学机制，其中包括 16 种物质和 41 个反应。为了证明数值方法的精度，进行了一些实验测试，数值结果与实验测量吻合较好。数值结果表明，与常规多孔燃烧器相比，无孔火焰燃烧器具有更高的火焰稳定性，且无孔火焰燃烧器的辐射效率低于多孔燃烧器。此外，多孔介质热传导的增加导致火焰稳定性的延长。此外，结果表明，随着多孔介质孔隙密度的降低，火焰稳定性得到延长。