Numerical modeling for multiple combustion modes in turbulent partially premixed jet flames
Numerical modeling for multiple combustion modes in turbulent partially premixed jet flames
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DOI：
10.1007/s12206-018-1049-0
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发表时间：
2018-11
影响因子：
1.6
通讯作者：
Hyunggeun Ji;Minjun Kwon;Sewon Kim;Yongmo Kim
中科院分区：
文献类型：
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作者：
Hyunggeun Ji;Minjun Kwon;Sewon Kim;Yongmo Kim
在本研究中，使用多环境概率密度函数（MEPDF）模型对具有近均匀和不均匀入口的多种燃烧模式下的火焰结构进行数值研究。对于几乎同质和非同质的情况，MEPDF 方法显示出与条件统计数据以及无条件均值和方差标量的实验数据良好的一致性。然而，反应区边缘存在明显的差异，这主要是由于基于RANS的湍流模型的缺点。预测结果表明，所使用的模型在描述下游区域局部灭绝的燃烧过程时存在局限性。对于预测的条件环境散射，多环境 PDF 模型已显示出精确模拟从富燃料侧到化学计量侧的近垂直转变的能力。基于数值结果，详细讨论了多燃烧模式湍流部分预混射流火焰的特性以及现有模型的不足。
In this study, the multi-environment probability density function (MEPDF) model has been used to numerically investigate the flame structure under the multiple combustion modes with nearly homogeneous and inhomogeneous inlets. For nearly homogeneous and inhomogeneous cases, the MEPDF approach shows a good conformity with experimental data both conditioned statistics, and unconditioned mean and variance scalars. However, there exist the distinct discrepancies in the edge of reaction zone mainly due to the shortcomings of the RANS-based turbulence model. Predicted results indicate that the used model shows the limitation to describe the combustion processes with the local extinction in the downstream regions. With regard to the predicted conditioned environment scatters, the multienvironment PDF model has shown the capability to precisely simulate the nearly perpendicular shift from the fuel-rich side to the stoichiometric side. Based on the numerical results, detailed discussion was made for the characteristics of turbulent partially premixed jet flames with multiple combustion modes and the shortcomings of present model.