Large-Eddy Simulation in an Industrial Gasturbine Combustor for NOx Prediction
Large-Eddy Simulation in an Industrial Gasturbine Combustor for NOx Prediction
复制标题
用于氮氧化物预测的工业燃气轮机燃烧器中的大涡模拟
DOI：
10.1115/gt2012-68925
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Kyohei Matsuya
中科院分区：
文献类型：
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作者：
K. Hirano;Yoshiharu Nonaka;Y. Kinoshita;N. Oshima;Kyohei Matsuya
降低NOx排放对于发展燃气涡轮发动机是重要的。通过数值模拟预测热剖面和污染物排放因子，对降低开发成本是有效的。本文采用大涡模拟与双标量火焰面方法相结合的方法，对某工业燃气轮机燃烧室进行了数值分析。对L20 A-DLE燃气涡轮发动机燃烧室进行了计算。研究了不同负荷下燃烧室的性能。NOx生成量随负荷的降低而降低，这一趋势与实验结果吻合较好。据说，NOx的产生是由于大量的补充燃烧器燃料。模拟中的NOx生成量低于实验中的NOx生成量。燃烧室出口的模拟温度也低于绝热温度。此外，燃料在燃烧器区域内没有完全燃烧。研究了补燃器燃烧状态的差异。对于扩散火焰，由于富燃料区域的存在，局部观察到高温区域。对于NOx生产，使用引入预混火焰的燃烧器预期NOx排放减少。从模拟结果，我们可以估计在燃气轮机燃烧室中的NOx的产生。载荷差异的趋势与实验数据吻合得很好，表明了预混火焰的优越性。Copyright © 2012 by ASME
NOx emission reduction is important for developing gas-turbine engines. Predicting the thermal profile and pollutant-emission factor by numerical simulation is effective for reducing the development costs. Here a large eddy simulation coupled with a 2-scalar flamelet approach is applied to the numerical analysis of an industrial gas-turbine combustor. The combustor of an L20A-DLE gas-turbine engine is calculated. Combustor performance under different loads is investigated. NOx production decreases with reducing load, and this tendency agrees well with the experimental results. It is said that NOx production due to a large amount of supplemental burner fuel. NOx production in the simulation is lower than in the experiment. The simulated temperature in the combustor outlet is also lower than the adiabatic temperature. Moreover, the fuel is not burned completely within the combustor region. The difference in the combustion status in a supplemental burner is investigated. For the diffusion flame, a high-temperature region is observed locally owing to the presence of a fuel-rich region. For NOx production, NOx emission reduction is expected using a burner that introduces a premixed flame. From the simulation results, we can estimate NOx production in a gas-turbine combustor. The tendencies in the differences of the loads agreed well with the experimental data, and the superiority of a premixed flame was indicated.Copyright © 2012 by ASME