Large Eddy Simulation of Bluff-Body Flame Approaching Blow-Off: A Sensitivity Study
| Autor: | Robert-Zoltán Szász, Erdzan Hodzic, Juliana Early, Christophe Duwig, Marco Geron, Mehdi Jangi, Laszlo Fuchs, Xue-Song Bai |
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| Rok vydání: | 2018 |
| Předmět: |
Work (thermodynamics)
Chemistry(all) Turbulence 020209 energy General Chemical Engineering General Physics and Astronomy Energy Engineering and Power Technology Probability density function 02 engineering and technology General Chemistry Mechanics Combustion 01 natural sciences 010305 fluids & plasmas Fuel Technology Extinction (optical mineralogy) 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Sensitivity (control systems) Focus (optics) Large eddy simulation |
| Zdroj: | Hodzic, E, Jangi, M, Szasz, R-Z, Geron, M, Early, J & Bai, X-S 2018, ' Large Eddy Simulation of Bluff-Body Flame Approaching Blow-Off: A Sensitivity Study ', Combustion science and Technology . https://doi.org/10.1080/00102202.2018.1536125 |
| ISSN: | 1563-521X 0010-2202 |
| DOI: | 10.1080/00102202.2018.1536125 |
| Popis: | 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 modeling flames just prior to and during the transient blow-off process. While the average flow-fields do not reveal any significant differences between modeling 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. (Less) |
| Databáze: | OpenAIRE |
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