Measurements and LES calculations of turbulent premixed flame propagation past repeated obstacles
Measurements and LES calculations of turbulent premixed flame propagation past repeated obstacles
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DOI：
10.1016/j.combustflame.2011.05.008
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发表时间：
2011-12
影响因子：
4.4
通讯作者：
S. Gubba;S. Ibrahim;W. Malalasekera;A. Masri
中科院分区：
文献类型：
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作者：
S. Gubba;S. Ibrahim;W. Malalasekera;A. Masri
在实验室尺度燃烧室中，对湍流预混火焰通过固体障碍物进行了测量和大涡模拟。使用的混合物是化学计量的丙烷/空气混合物，从静止状态点燃。对多种流型进行了研究。根据内置固体障碍物的数量和位置，配置有所不同。本研究的主要目的有两个方面。首先，验证新开发的动态火焰表面密度(DFSD)模型在大范围流动条件下的有效性。第二，在控制良好的燃烧室中提供流动和燃烧的可重复测量。共有四组用于预测结果和实验测量之间的定性和定量比较。基团的概念可以更好地理解火焰-流动相互作用以及固体挡板的数量和位置对点火源的影响。给出了点火后不同时刻火焰结构、位置、速度和加速度的计算结果，并进行了讨论。文中还给出了火焰传播过程中各种流动形态的压力-时间历程和燃烧模式。
Measurements and Large Eddy Simulations (LES) have been carried out for a turbulent premixed flame propagating past solid obstacles in a laboratory scale combustion chamber. The mixture used is a stoichiometric propane/air mixture, ignited from rest. A wide range of flow configurations are studied. The configurations vary in terms of the number and position of the built-in solid obstructions. The main aim of the present study is two folded. First, to validate a newly developed dynamic flame surface density (DFSD) model over a wide range of flow conditions. Second, to provide repeatable measurements of the flow and combustion in a well-controlled combustion chamber. A total of four groups are derived for qualitative and quantitative comparisons between predicted results and experimental measurements. The concept of groups offers better understanding of the flame–flow interactions and the impact of number and position of the solid baffle plates with respect to the ignition source. Results are presented and discussed for the flame structure, position, speed and accelerations at different times after ignitions. The pressure–time histories are also presented together with the regimes of combustion for all flow configurations during the course of flame propagation.