Large Eddy Simulation of Bluff-Body Flame Approaching Blow-Off: A Sensitivity Study

Erdzan Hodzic, Mehdi Jangi, Robert-Zoltan Szasz, Marco Geron, Juliana Early, Xue-Song Bai

Research output: Contribution to journalArticle

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Abstract

As almost all combustion processes of practical interest take place in the presence of turbulence, the development of the increasingly refined turbulence-chemistry interaction (TCI) models has led to highly sophisticated approaches. Nearly all of the studies comparing different models focus on stable premixed/non premixed flame configurations. In this work, the focus is on well-documented, lean premixed bluff-body stabilized flames approaching blow-off and on the blow-off sequence itself. Large Eddy Simulations (LES)have been used to capture the time-dependent, three-dimensional flow-field using Transported Probability Density Function (TPDF), Partially Stirred Reactor Model (PaSR) and Implicit LES (ILES) models. Furthermore,the influence of finite-rate chemistry and different chemical mechanisms is evaluated to determine the limitation and capability of the different TCI approaches for modelling flames just prior to and during the transient blow-off process. While the average flow-fields do not reveal any significant differences between modelling approaches, detailed analysis of the flame reveals that there are differences in the predicted flame thickness and composition. The ability of the considered TCI models to predict local as well as full flame extinction during the blow-off is investigated as well. It is demonstrated that such a blow-off sequence is not always governed by complex chemistry.
Original languageEnglish
Number of pages28
JournalCombustion science and Technology
Early online date30 Oct 2018
DOIs
Publication statusEarly online date - 30 Oct 2018

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bluff bodies
Large eddy simulation
large eddy simulation
flames
chemistry
Turbulence
turbulence
sensitivity
Flow fields
flow distribution
three dimensional flow
premixed flames
interactions
probability density functions
Probability density function
extinction
reactors
configurations
Chemical analysis

Cite this

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title = "Large Eddy Simulation of Bluff-Body Flame Approaching Blow-Off: A Sensitivity Study",
abstract = "As almost all combustion processes of practical interest take place in the presence of turbulence, the development of the increasingly refined turbulence-chemistry interaction (TCI) models has led to highly sophisticated approaches. Nearly all of the studies comparing different models focus on stable premixed/non premixed flame configurations. In this work, the focus is on well-documented, lean premixed bluff-body stabilized flames approaching blow-off and on the blow-off sequence itself. Large Eddy Simulations (LES)have been used to capture the time-dependent, three-dimensional flow-field using Transported Probability Density Function (TPDF), Partially Stirred Reactor Model (PaSR) and Implicit LES (ILES) models. Furthermore,the influence of finite-rate chemistry and different chemical mechanisms is evaluated to determine the limitation and capability of the different TCI approaches for modelling flames just prior to and during the transient blow-off process. While the average flow-fields do not reveal any significant differences between modelling approaches, detailed analysis of the flame reveals that there are differences in the predicted flame thickness and composition. The ability of the considered TCI models to predict local as well as full flame extinction during the blow-off is investigated as well. It is demonstrated that such a blow-off sequence is not always governed by complex chemistry.",
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Large Eddy Simulation of Bluff-Body Flame Approaching Blow-Off: A Sensitivity Study. / Hodzic, Erdzan; Jangi, Mehdi; Szasz, Robert-Zoltan; Geron, Marco; Early, Juliana; Bai, Xue-Song.

In: Combustion science and Technology, 30.10.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Large Eddy Simulation of Bluff-Body Flame Approaching Blow-Off: A Sensitivity Study

AU - Hodzic, Erdzan

AU - Jangi, Mehdi

AU - Szasz, Robert-Zoltan

AU - Geron, Marco

AU - Early, Juliana

AU - Bai, Xue-Song

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AB - As almost all combustion processes of practical interest take place in the presence of turbulence, the development of the increasingly refined turbulence-chemistry interaction (TCI) models has led to highly sophisticated approaches. Nearly all of the studies comparing different models focus on stable premixed/non premixed flame configurations. In this work, the focus is on well-documented, lean premixed bluff-body stabilized flames approaching blow-off and on the blow-off sequence itself. Large Eddy Simulations (LES)have been used to capture the time-dependent, three-dimensional flow-field using Transported Probability Density Function (TPDF), Partially Stirred Reactor Model (PaSR) and Implicit LES (ILES) models. Furthermore,the influence of finite-rate chemistry and different chemical mechanisms is evaluated to determine the limitation and capability of the different TCI approaches for modelling flames just prior to and during the transient blow-off process. While the average flow-fields do not reveal any significant differences between modelling approaches, detailed analysis of the flame reveals that there are differences in the predicted flame thickness and composition. The ability of the considered TCI models to predict local as well as full flame extinction during the blow-off is investigated as well. It is demonstrated that such a blow-off sequence is not always governed by complex chemistry.

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