Calculation of the flow field and NOx emissions of a gas turbine combustor by a coarse computational fluid dynamics model
Calculation of the flow field and NOx emissions of a gas turbine combustor by a coarse computational fluid dynamics model
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DOI：
10.1016/j.energy.2011.12.013
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发表时间：
2012-09
期刊：
影响因子：
9
通讯作者：
Paolo Gobbato;M. Masi;A. Toffolo;A. Lazzaretto;G. Tanzini
中科院分区：
文献类型：
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作者：
Paolo Gobbato;M. Masi;A. Toffolo;A. Lazzaretto;G. Tanzini
燃气涡轮机的性能在很大程度上取决于燃烧室内的流场。在初级区，热产物的再循环稳定了火焰并完成了燃料氧化。在稀释区，混合过程可以在涡轮机入口处获得合适的温度分布。本文对以天然气和氢气为燃料的燃气涡轮机燃烧室内的等温流场和反应流场进行了实验和计算分析。该研究旨在评估粗网格计算流体动力学模型的能力，在以前的反应计算中已经验证，在预测流场和NOx排放。在等温流动试验台上进行了一系列试验，以研究燃烧空气分裂和主空气射流和稀释空气射流的穿透。这些实验数据被用来验证等温计算。燃烧对计算流场和空气分裂的影响进行了研究。最后，NOx排放趋势估计的后处理技术。在燃烧室排放的数值NOx浓度与实验测量结果进行了比较，在操作过程中获得不同的燃料燃烧（天然气或氢气）和不同量的蒸汽注入。
Gas turbine performance is strongly dependent on the flow field inside the combustor. In the primary zone, the recirculation of hot products stabilises the flame and completes the fuel oxidation. In the dilution zone, the mixing process allows to obtain the suitable temperature profile at turbine inlet. This paper presents an experimental and computational analysis of both the isothermal and the reactive flow field inside a gas turbine combustor designed to be fed with natural gas and hydrogen. The study aims at evaluating the capability of a coarse grid CFD model, already validated in previous reactive calculations, in predicting the flow field and NOxemissions. An experimental campaign was performed on an isothermal flow test rig to investigate the combustion air splitting and the penetration of both primary and dilution air jets. These experimental data are used to validate the isothermal computations. The impact of combustion on the calculated flow field and on air splitting is investigated as well. Finally, NOxemission trend estimated by a post-processing technique is presented. The numerical NOxconcentrations at the combustor discharge are compared with experimental measurements acquired during operation with different fuel burnt (natural gas or hydrogen) and different amount of steam injected.