A Large-Eddy Simulation-Linear-Eddy Model Study of Preferential Diffusion Processes in a Partially Premixed Swirling Combustor With Synthesis Gases
A Large-Eddy Simulation-Linear-Eddy Model Study of Preferential Diffusion Processes in a Partially Premixed Swirling Combustor With Synthesis Gases
复制标题
合成气部分预混旋流燃烧室优先扩散过程的大涡模拟线性涡模型研究
DOI：
10.1115/1.4034446
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发表时间：
2017
影响因子：
1.5
通讯作者：
Jiang Xi
中科院分区：
文献类型：
--
作者：
Li Shaoshuai;Zheng Yunzhe;Mira Daniel;Li Suhui;Zhu Min;Jiang Xi
采用大涡模拟（LES）方法对一个以合成气为工质的贫油部分预混旋流燃烧室进行了研究。采用线性涡模型（LEM），在非统一刘易斯数假设下，封闭了未解析的标量通量。LES过滤操作产生的几个项没有建模，而是考虑到其独特的长度和时间尺度（例如分子扩散、标量混合和化学反应）而直接求解。首先，在一个完善的射流火焰的验证结果表明与实验数据的相关性良好的水平，并允许进一步分析合成气燃烧的实际燃烧室。其次，研究了优先扩散对贫油部分预混旋流燃烧室流动和燃烧特性的影响。研究结果可为合成气燃气涡轮机燃烧系统的设计和运行提供参考。
A lean partially premixed swirling combustor operated with synthesis gases is studied using large-eddy simulation (LES). The linear-eddy model (LEM) is employed to close the unresolved scalar fluxes with the nonunity Lewis number assumption. Several terms resulting from the LES filtering operation are not modeled but directly resolved considering their unique length and time scales, such as molecular diffusion, scalar mixing, and chemical reactions. First, the validation results on a well-established jet flame indicate a good level of correlation with the experimental data and allow a further analysis of syngas combustion on a practical combustor. Second, the effects of preferential diffusion on the characteristics of flow and combustion dynamics on a lean partially premixed swirling combustor are investigated. The obtained results are expected to provide useful information for the design and operation of gas turbine combustion systems using syngas fuels.