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Flame structure analysis and flamelet progress variable modelling of strained coal flames

Messig, D. and Vascellari, M. and Hasse, C. (2017):
Flame structure analysis and flamelet progress variable modelling of strained coal flames.
In: Combustion Theory and Modelling, Taylor & Francis, pp. 700-721, 21, (4), ISSN 1741-3559, DOI: 10.1080/13647830.2017.1290279, [Online-Edition: http://dx.doi.org/10.1080/13647830.2017.1290279],
[Article]

Abstract

Strained two-phase pulverised coal flames in a counterflow configuration are investigated numerically. Three operating conditions with different coal-to-primary-air ratios and inlet velocities were evaluated in order to establish different flame regimes. At first, the two-phase flow of the fully resolved reference cases is calculated solving the transport equation for the species and directly evaluating the reaction rates. Different flame structures are identified using the heat release rate and the chemical explosive mode as markers, showing that complex structures with a combination of lean premixed and non-premixed flames can be observed in strained counterflow coal flames. In addition to the fully resolved simulation, the suitability of the Flamelet-Progress Variable (FPV) model is investigated. Both premixed and non-premixed tables are employed. At first, the suitability of the look-up tables is evaluated by means of an a priori analysis, using the fully resolved simulations as reference solutions, showing that the non-premixed flamelet table correctly predicts the structure of the strained coal flames, while the premixed table shows sensible deviations in terms of temperature and species, especially at rich conditions. Finally, the a posteriori analysis shows that the fully coupled FPV model with a non-premixed flamelet look-up table can accurately predict strained coal flames.

Item Type: Article
Erschienen: 2017
Creators: Messig, D. and Vascellari, M. and Hasse, C.
Title: Flame structure analysis and flamelet progress variable modelling of strained coal flames
Language: English
Abstract:

Strained two-phase pulverised coal flames in a counterflow configuration are investigated numerically. Three operating conditions with different coal-to-primary-air ratios and inlet velocities were evaluated in order to establish different flame regimes. At first, the two-phase flow of the fully resolved reference cases is calculated solving the transport equation for the species and directly evaluating the reaction rates. Different flame structures are identified using the heat release rate and the chemical explosive mode as markers, showing that complex structures with a combination of lean premixed and non-premixed flames can be observed in strained counterflow coal flames. In addition to the fully resolved simulation, the suitability of the Flamelet-Progress Variable (FPV) model is investigated. Both premixed and non-premixed tables are employed. At first, the suitability of the look-up tables is evaluated by means of an a priori analysis, using the fully resolved simulations as reference solutions, showing that the non-premixed flamelet table correctly predicts the structure of the strained coal flames, while the premixed table shows sensible deviations in terms of temperature and species, especially at rich conditions. Finally, the a posteriori analysis shows that the fully coupled FPV model with a non-premixed flamelet look-up table can accurately predict strained coal flames.

Journal or Publication Title: Combustion Theory and Modelling
Volume: 21
Number: 4
Publisher: Taylor & Francis
Divisions: 16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS)
16 Department of Mechanical Engineering
Date Deposited: 16 Nov 2017 12:59
DOI: 10.1080/13647830.2017.1290279
Official URL: http://dx.doi.org/10.1080/13647830.2017.1290279
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