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Application of flamelet/progress-variable approach to the large eddy simulation of a turbulent jet flame of pulverized coals

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journal contribution
posted on 07.12.2020, 11:03 authored by Shota Akaotsu, Yohsuke Matsushita, Hideyuki Aoki, Weeratunge MalalasekeraWeeratunge Malalasekera
In this study, the flamelet/progress-variable (FPV) approach was applied to a large eddy simulation of a pulverized coal jet flame. The FPV approach considers the characteristics of the pulverized coal flame, e.g., non-adiabatic system and several types of fuel streams, via additional representative variables. First, the applicability of the FPV approach to a turbulent flame with pulverized coals was confirmed through a comparison of the numerical solutions and experimental data. In this study, the pure pilot case was also investigated to clarify the effects of pulverized coals on the flame. The flame structure changes significantly upon the injection of pulverized coals, and the flame index suggests the coexistence of premixed and diffusion combustion modes even in the downstream region. In particular, the combustion mode fluctuates with time in the middle region of the flame. The fuel gas released from the pulverized coals should increase in this region; therefore, the release and combustion behavior of the volatile matter must be involved in the combustion mode variation. The evaluation of the combustion modes of fuel gas in the coal flame is useful for the design and optimization of pulverized coal combustors with next-generation technologies.

Funding

Japan Society for the Promotion of Science (JSPS) Research Fellow[Grant No. 18J11135]

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Advanced Powder Technology

Volume

31

Issue

10

Pages

4253 - 4274

Publisher

Elsevier and The Society of Powder Technology Japan

Version

AM (Accepted Manuscript)

Rights holder

© The Society of Powder Technology Japan

Publisher statement

This paper was accepted for publication in the journal Advanced Powder Technology and the definitive published version is available at https://doi.org/10.1016/j.apt.2020.09.005.

Acceptance date

07/09/2020

Publication date

2020-10-06

Copyright date

2020

ISSN

0921-8831

eISSN

1568-5527

Language

en

Depositor

Prof Weeratunge Malalasekera. Deposit date: 3 December 2020