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The acoustic response of burner-stabilized flat flames: a two-dimensional numerical analysis

机译：燃烧器稳定的平火焰的声响应：二维数值分析

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摘要

The response of burner-stabilized flat flames to acoustic perturbations is studied numerically. So far, one-dimensional models have been used to study this system. However, in most practical surface burners, the scale of the perforations in the burner plate is of the order of the flame thickness. This is expected to disturb the one-dimensional behavior and the main effects are studied using a 2-D numerical model. The numerical setup involves the set of 2-D transport equations for low-Mach number reacting flows using a simple reaction mechanism. After a short review of the physical phenomena observed so far in one-dimensional flames, the effect of a finite width of the perforations in a perfectly cooled burner is investigated for steady and unsteady flames in a 2-D micro-slit configuration. The influence on the acoustic response is also studied and the results are compared with one-dimensional calculations using volume-averaged models for the heat and mass transfer in the perforated burner plate to incorporate the 2-D effects. This last study shows that effective one-dimensional models are not able to incorporate all 2-D effects due to the presence of the burner plate in the flow. The acoustic transfer matrix can be applied to the stability analysis of acoustic systems with a porous or perforated surface burner. The most interesting application is the acoustic behavior of central heating systems.
机译：数值研究了燃烧器稳定的平火焰对声扰动的响应。到目前为止，已经使用一维模型来研究该系统。但是，在大多数实际的表面燃烧器中，燃烧器板上的孔眼的尺寸约为火焰厚度。预期这会干扰一维行为，并使用二维数值模型研究主要效果。数值设置涉及使用简单反应机制的低马赫数反应流的二维输运方程组。在简短回顾了迄今为止在一维火焰中观察到的物理现象之后，针对二维微缝构造中的稳定和不稳定火焰，研究了在完全冷却的燃烧器中穿孔有限宽度的影响。还研究了对声学响应的影响，并将结果与​​使用体积平均模型的一维计算进行了比较，以计算多孔燃烧器板中的热量和质量传递，从而纳入了二维效果。这项最后的研究表明，有效的一维模型由于流中存在燃烧器板而无法合并所有二维效果。声传递矩阵可用于带有多孔或穿孔表面燃烧器的声学系统的稳定性分析。最有趣的应用是中央供暖系统的声学特性。

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