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Evaluation of radiation modeling approaches for non-premixed flamelets considering a laminar methane air flame

Messig, D. and Hunger, F. and Keller, J. and Hasse, C. (2013):
Evaluation of radiation modeling approaches for non-premixed flamelets considering a laminar methane air flame.
In: Combustion and Flame, Elsevier, pp. 251-264, 160, ISSN 0010-2180, DOI: 10.1016/j.combustflame.2012.10.009, [Online-Edition: http://10.1016/j.combustflame.2012.10.009],
[Article]

Abstract

The scope of this investigation is to evaluate different radiation modeling approaches for both Lagrangian and Eulerian flamelet models by comparing them to fully resolved simulation data of a non-premixed flame. The numerical investigations are performed for a well established laminar methane diffusion flame 1. The available experimental data is used to validate the CFD results, which clearly show that radiation must be considered in this flame to accurately describe the flame structure. Based on the validated CFD results the main focus is to analyze the applicability of radiation modeling approaches within the flamelet framework for unity Lewis number and differential diffusion. An unsteady Lagrangian flamelet model with direct integration of the radiation source term as well as an enthalpy defect formulation for steady and unsteady flamelet calculations are considered. Several model variants are introduced and discussed and the corresponding time scales for mixing, radiation and chemistry are analyzed. Based on the Lagrangian flamelet time and the enthalpy defect, both postprocessed from the CFD solution, flamelet calculations are carried out and detailed comparisons to the CFD simulation results are performed for the temperature and several species along the axis and in several radial slices. The results are finally used to evaluate the different approaches concerning their applicability and accuracy for use in coupled CFD-flamelet simulations.

Item Type: Article
Erschienen: 2013
Creators: Messig, D. and Hunger, F. and Keller, J. and Hasse, C.
Title: Evaluation of radiation modeling approaches for non-premixed flamelets considering a laminar methane air flame
Language: English
Abstract:

The scope of this investigation is to evaluate different radiation modeling approaches for both Lagrangian and Eulerian flamelet models by comparing them to fully resolved simulation data of a non-premixed flame. The numerical investigations are performed for a well established laminar methane diffusion flame 1. The available experimental data is used to validate the CFD results, which clearly show that radiation must be considered in this flame to accurately describe the flame structure. Based on the validated CFD results the main focus is to analyze the applicability of radiation modeling approaches within the flamelet framework for unity Lewis number and differential diffusion. An unsteady Lagrangian flamelet model with direct integration of the radiation source term as well as an enthalpy defect formulation for steady and unsteady flamelet calculations are considered. Several model variants are introduced and discussed and the corresponding time scales for mixing, radiation and chemistry are analyzed. Based on the Lagrangian flamelet time and the enthalpy defect, both postprocessed from the CFD solution, flamelet calculations are carried out and detailed comparisons to the CFD simulation results are performed for the temperature and several species along the axis and in several radial slices. The results are finally used to evaluate the different approaches concerning their applicability and accuracy for use in coupled CFD-flamelet simulations.

Journal or Publication Title: Combustion and Flame
Volume: 160
Publisher: Elsevier
Uncontrolled Keywords: Laminar non-premixed flames, Steady and unsteady flamelets, Radiation;, Differential diffusion, Enthalpy defect
Divisions: 16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS)
16 Department of Mechanical Engineering
Date Deposited: 15 Nov 2017 15:19
DOI: 10.1016/j.combustflame.2012.10.009
Official URL: http://10.1016/j.combustflame.2012.10.009
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