An augmented reduced mechanism for methane oxidation with comprehensive global parametric validation

Sung, Chih-Jen; Law, Chung K.; Chen, Jyh-Yuan

doi:10.1016/s0082-0784(98)80416-5

Cited by 139 publications

(44 citation statements)

References 3 publications

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“…Our aim is to apply the Augmented Reduced Mechanism (ARM) of [27], in order to reduce shortcomings from the chemistry model. The simulations have been performed with the commercial CFD package FLUENT and first attempts with ARM were not successful.…”

Section: Transported Pdf Results -Influence Of the Pilot Flame Modelmentioning

confidence: 99%

Flow and Mixing Fields for Transported Scalar PDF Simulations of a Piloted Jet Diffusion Flame (‘Delft Flame III’)

Merci

Naud

Roekaerts

2005

Flow Turbulence Combust

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Abstract. Numerical simulation results are presented for 'Delft Flame III', a piloted jet diffusion flame with strong turbulence-chemistry interaction. While pilot flames emerge from 12 separate holes in the experiments, the simulations are performed on a rectangular grid, under the assumption of axisymmetry. In the first part of the paper, flow and mixing field results are presented with a non-linear first order k-ε model, with the transport equation for ε based on a modeled enstrophy transport equation, for cold and reactive flows. For the latter, the turbulence model is applied in combination with pre-assumed β-PDF modeling for the turbulence-chemistry interaction. The mixture fraction serves as conserved scalar. Two chemistry models are considered: chemical equilibrium and a steady laminar flamelet model. The importance of the turbulence model is highlighted. The influence of the chemistry model is noticeable too. A procedure is described to construct appropriate inlet boundary conditions. Still, the generation of accurate inlet boundary conditions is shown to be far less important, their effect being local, close to the nozzle exit. In the second part of the paper, results are presented with the transported scalar PDF approach as turbulencechemistry interaction model. A C 1 skeletal scheme serves as chemistry model, while the EMST method is applied as micro-mixing model. For the transported PDF simulations, the model for the pilot flames, as an energy source term in the mean enthalpy transport equation, is important with respect to the accuracy of the flow field predictions. It is explained that the strong influence on the flow and mixing field is through the turbulent shear stress force in the region, close to the nozzle exit.

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Section: Transported Pdf Results -Influence Of the Pilot Flame Modelmentioning

confidence: 99%

Flow and Mixing Fields for Transported Scalar PDF Simulations of a Piloted Jet Diffusion Flame (‘Delft Flame III’)

Merci

Naud

Roekaerts

2005

Flow Turbulence Combust

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“…5. The conditional chemistry terms ω α | η are calculated by the ODE solver VODPK [53] with ARM2 mechanism which includes 19 species and 15 reactions [54]. The micromixing term in Eq.…”

Section: Flow Considered and Numerical Implementationsmentioning

confidence: 99%

Prediction of Global Extinction Conditions and Dynamics in Swirling Non-premixed Flames Using LES/CMC Modelling

Zhang

Mastorakos

2015

Flow Turbulence Combust

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The Large Eddy Simulation (LES)/three-dimensional Conditional Moment Closure (CMC) model with detailed chemistry is applied to predict the operating condition and dynamics of complete extinction (blow-off) in swirling non-premixed methane flames. Using model constants previously selected to provide relatively accurate predictions of the degree of local extinction in the piloted jet flames Sandia D−F, the error in the blow-off air velocity predicted by LES/3D-CMC in short, recirculating flames with strong swirl for a range of fuel flow rates is within 25 % of the experimental value, which is considered a new and promising result for combustion LES that has not been applied before for the prediction of the whole blow-off curve in complex geometries. The results also show that during the blow-off transient, the total heat release gradually decreases over a duration that agrees well with experiment. The evolution of localized extinction, reactive scalars and scalar dissipation rate is analyzed. It has been observed that a consistent symptom for flames approaching blow-off is the appearance of high-frequency and high-magnitude fluctuations of the conditionally filtered stoichiometric scalar dissipation rate, resulting in an increased fraction of local extinction over the stoichiometric mixture fraction iso-surfaces. It is also shown that the blow-off time changes with the different blow-off conditions.

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“…The difference between this set and the one employed in [34], for example, are the species CH 3 , C 2 H 6 , CH 2 O and CH 3 OH, while HCCOH is not included here. If we compare, though, with the ARM mechanism [49], the difference is that H 2 O 2 and HO 2 are not included in our set, while CH 2 CO, CH 3 OH and O are not included in the former. The last three species can be found in the reduced mechanism of Lu and Law [36] who also used CSP, the only difference with their mechanism being H 2 O 2 and HO 2 .…”

Section: Derivation Of the Mechanismmentioning

confidence: 99%

A methodology for derivation of RCCE-reduced mechanisms via CSP

Koniavitis

Rigopoulos

Jones

2017

Combustion and Flame

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An augmented reduced mechanism for methane oxidation with comprehensive global parametric validation

Cited by 139 publications

References 3 publications

Flow and Mixing Fields for Transported Scalar PDF Simulations of a Piloted Jet Diffusion Flame (‘Delft Flame III’)

Flow and Mixing Fields for Transported Scalar PDF Simulations of a Piloted Jet Diffusion Flame (‘Delft Flame III’)

Prediction of Global Extinction Conditions and Dynamics in Swirling Non-premixed Flames Using LES/CMC Modelling

A methodology for derivation of RCCE-reduced mechanisms via CSP

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