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Numerical study of a turbulent co-axial non-premixed flame for methanol hydrothermal combustion: Comparison of the EDC and FGM models
The Journal of Supercritical Fluids ( IF 3.9 ) Pub Date : 2020-12-05 , DOI: 10.1016/j.supflu.2020.105132
Mengmeng Ren , Shuzhong Wang , N. Romero-Anton , Junxue Zhao , Chong Zou , Dirk Roekaerts

Eddy dissipation concept (EDC) model and flamelet generated manifolds (FGM) model are developed separately to study the temperature profiles and extinction limits of non-premixed hydrothermal flames. Predictions by the two models are evaluated comparatively by experimental data in literatures. FGM model shows relatively better prediction of temperature than EDC model in the near nozzle field. Extinction temperatures can be predicted by EDC model with deviations of 10–33 K. The extinction flow rates predicted by the FGM model are higher than those by the EDC model. Flow fields and reaction source terms are analysed to identify the inherent mechanism leading different results by the two models. It is illustrated that the positive effect of turbulence on reaction rate near the nozzle by the FGM model is the essential reason causing different flame characteristics from the EDC model by which the turbulence only has negative effect on reaction rate.



中文翻译:

用于甲醇水热燃烧的湍流同轴非预混火焰的数值研究:EDC和FGM模型的比较

分别开发了涡流消散概念(EDC)模型和小火焰生成歧管(FGM)模型,以研究非预混热液火焰的温度曲线和消光极限。两种模型的预测是通过文献中的实验数据进行比较评估的。在近喷嘴场中,FGM模型显示出比EDC模型更好的温度预测。可以通过EDC模型预测灭绝温度,其偏差为10–33K。FGM模型预测的灭绝流速高于EDC模型。分析流场和反应源项以识别导致两个模型结果不同的内在机理。

更新日期:2020-12-15
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