Numerical study of a turbulent co-axial non-premixed flame for methanol hydrothermal combustion

Comparison of the EDC and FGM models

Journal article (2021)

Authors

Mengmeng Ren Xi'an University of Architecture and Technology
Shuzhong Wang Xi’an Jiaotong University
N. Romero-Anton University of the Basque Country
Junxue Zhao Xi'an University of Architecture and Technology
Chong Zou Xi'an University of Architecture and Technology
D.J.E.M. Roekaerts Fluid Mechanics - Mechanical, Maritime and Materials Engineering
Research Group
Fluid Mechanics (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2021 Mengmeng Ren, Shuzhong Wang, N. Romero-Anton, Junxue Zhao, Chong Zou, D.J.E.M. Roekaerts
DOI: https://doi.org/10.1016/j.supflu.2020.105132
Hydrothermal combustion Eddy dissipation concept (EDC) model Extinction limits Flame temperature profile Flamelet generated manifolds (FGM) model Turbulence-chemistry interaction
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Published Date

2021

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Fluid Mechanics

Abstract

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.