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Effects of infinitely fast chemistry on combustion behavior of coaxial diffusion flame predicted by large eddy simulation

journal contribution
posted on 26.09.2019 by Shota Akaotsu, Ryoma Ozawa, Yohsuke Matsushita, Hideyuki Aoki, Weeratunge Malalasekera
Large eddy simulations (LES) based on turbulent combustion models aid the design and optimization of combustors. Of the various combustion models available, the eddy break up (EBU) model is widely used because it assumes an infinitely fast chemistry. However, omitting the actual chemical kinetics can cause unexpected behavior, and the characteristics of the combustion models need to be elucidated. Here, the effects of an infinitely fast chemistry on the combustion behavior of a coaxial diffusion flame as predicted by an LES were analyzed. Although the EBU model captured the overall behavior of the chemical species as well as the flow field, the gas temperature and mass fractions of the combustion products in the mixing region of the fuel and oxidizer streams were overestimated. In contrast, the flamelet/progress variable (FPV) model yielded results that were in better agreement with the experimental data, because while the EBU model assumes an infinitely fast chemistry, the look-up tables used in the FPV model are based on the actual chemical kinetics. As these models can be used for the CFD simulations of coal and spray combustion, the results of this study should be useful for efficiently simulating practical combustion systems.

Funding

Japan Society for the Promotion of Science 395 (JSPS) [grant number JP18K03964]

Tonen General Sekiyu Research/Development Encouragement & Scholarship Foundation

“Leading Young Researcher Overseas Visit Program ”of Tohoku University

JSPS Grant-in-Aid for Research Fellows [grant number 18J11135]

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Fuel Processing Technology

Volume

199

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Fuel Processing Technology and the definitive published version is available at https://doi.org/10.1016/j.fuproc.2019.106226.

Acceptance date

20/09/2019

Publication date

2019-11-14

Copyright date

2019

ISSN

0378-3820

Language

en

Depositor

Prof Weeratunge Malalasekera

Article number

106226

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