Large Eddy Simulation of an industrial gas turbine combustor using reduced chemistry with accurate pollutant prediction
Large Eddy Simulation of an industrial gas turbine combustor using reduced chemistry with accurate pollutant prediction
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DOI：
10.1016/j.proci.2016.07.027
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
T. Jaravel;E. Riber;B. Cuenot;G. Bulat
中科院分区：
文献类型：
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作者：
T. Jaravel;E. Riber;B. Cuenot;G. Bulat
为了满足严格的污染物排放法规要求，需要对现代燃气涡轮机燃烧室进行强有力的优化，大涡模拟（LES）在设计阶段是一种很有前途的工具。然而，污染物的形成的准确预测仍然是一个挑战，因为在这种类型的配置复杂的火焰结构。本LES研究保留的策略是在SGT-100燃烧器中结合动态增稠火焰模型（TFLES）采用具有精确污染物化学的解析简化机制（ARC）。该机制的减少，首先提出和验证在燃烧器的操作条件下的典型情况下。然后，LES结果与实验数据的比较表明，速度统计和火焰形状和排气污染物预测方面的良好协议。进一步分析了湍流火焰的结构，并与层流无应变火焰和应变火焰进行了比较。不混合和应变被发现显着影响污染物的形成和火焰稳定。ARC/TFLES策略在成本和准确性之间有很好的折衷，说明了这些影响。
Complying with stringent pollutant emission regulations requires a strong optimization of modern gas turbine combustors, for which Large Eddy Simulation (LES) is a promising tool at the design stage. Yet the accurate prediction of pollutant formation remains a challenge because of the complex flame structure in this type of configuration. The strategy retained for the present LES study is to employ analytically reduced mechanism (ARC) with accurate pollutant chemistry in combination with the Dynamic Thickened Flame model (TFLES) in the SGT-100 burner. The reduction of the mechanism is first presented and validated in the burner operating conditions on canonical cases. Then, comparisons of LES results with the experimental data show the excellent agreement of velocity statistics and a good agreement in terms of flame shape and exhaust pollutant prediction. The turbulent flame structure is further analyzed and compared with laminar unstrained and strained flames. Unmixedness and strain are found to significantly impact pollutant formation and flame stabilization. The ARC/TFLES strategy accounts for these effects with a very good compromise between cost and accuracy.