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首页> 外文期刊>Combustion and Flame >Computational and experimental study of standing methane edge flames in the two-dimensional axisymmetric counterflow geometry
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Computational and experimental study of standing methane edge flames in the two-dimensional axisymmetric counterflow geometry

机译：二维轴对称逆流几何中甲烷直立火焰的计算和实验研究

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摘要

The structure of steady methane/enriched-air edge flames established in an axisymmetric, laminar counterflow configuration was investigated computationally and experimentally. Computationally, the steady-state equations were solved implicitly in a modified vorticity-velocity formulation on a nonstaggered, nonuniform grid, with detailed chemistry and transport. Experimental boundary conditions were chosen to establish flames with a hole centered at the axis of symmetry, the location where the largest strain rate occurs, in order to investigate the structure of the edge flame established at the outer periphery of the hole. Experimentally, CO PLIF, OH PLIF, and an observable proportional to the forward reaction rate (RR) of the reaction CO + OH → CO_2 + H were measured. Particle image velocimetry (PIV) was used to characterize the velocity field in the proximity of the fuel and oxi-dizer nozzles and to provide detailed boundary conditions for the simulations. Qualitatively, the flow field can be partitioned into two zones: a nonreactive counterflow region bound by two recirculation zones attached at the exits of the inlet nozzles, which aid mixing of products and reactants upstream of the edge flame; and a reactive region, where a premixed edge flame provides the stabilization mechanism for a trailing diffusion flame. Comparisons between the experimental and the computational data yielded quantitative agreement for all measured quantities. Further, we investigated the structure of the computational edge flames. We identified the most significant heat-release reactions for each of the flame branches. Finally, we examined correlations among the propagation speed of the edge flame and curvature and mixture fraction gradient by varying the global strain rate of the flame.
机译：通过计算和实验研究了以轴对称，层流逆流构型建立的稳定甲烷/富气边缘火焰的结构。在计算上，稳态方程是在无交错，不均匀网格上以改进的涡旋-速度公式隐式求解的，具有详细的化学和运输原理。选择实验边界条件以建立具有以对称轴为中心的孔的火焰，该孔是发生最大应变率的位置，以便研究在孔的外围处建立的边缘火焰的结构。实验上测量了CO PLIF，OH PLIF以及与反应CO + OH→CO_2 + H的正向反应速率（RR）成比例的可观察值。粒子图像测速仪（PIV）用于表征燃料喷嘴和氧化剂喷嘴附近的速度场，并为模拟提供详细的边界条件。定性地，流场可分为两个区域：一个非反应性逆流区域，该区域由连接在入口喷嘴出口处的两个再循环区域限制，这有助于边缘火焰上游的产物和反应物的混合；反应区，其中预混合的边缘火焰为后扩散火焰提供稳定机制。实验数据和计算数据之间的比较得出所有测量量的定量一致性。此外，我们研究了计算边缘火焰的结构。我们确定了每个火焰分支中最重要的放热反应。最后，我们通过改变火焰的整体应变率来检查边缘火焰的传播速度与曲率和混合分数梯度之间的相关性。

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