TY - JOUR
T1 - Application of flamelet/progress-variable approach to the large eddy simulation of a turbulent jet flame of pulverized coals
AU - Akaotsu, Shota
AU - Matsushita, Yohsuke
AU - Aoki, Hideyuki
AU - Malalasekera, Weeratunge
N1 - Funding Information:
The authors gratefully acknowledge the Grant-in-Aid for the Japan Society for the Promotion of Science (JSPS) Research Fellow [Grant No. 18J11135]. A portion of the numerical results in this research was obtained using the supercomputing resources at the Cyberscience Center, Tohoku University.
Funding Information:
The authors gratefully acknowledge the Grant-in-Aid for the Japan Society for the Promotion of Science (JSPS) Research Fellow [Grant No. 18J11135 ]. A portion of the numerical results in this research was obtained using the supercomputing resources at the Cyberscience Center, Tohoku University.
Publisher Copyright:
© 2020 The Society of Powder Technology Japan
PY - 2020/10
Y1 - 2020/10
N2 - 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.
AB - 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.
KW - Flame index
KW - Flamelet/progress-variable approach
KW - Jet flame
KW - Large eddy simulation
KW - Pulverized coal combustion
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U2 - 10.1016/j.apt.2020.09.005
DO - 10.1016/j.apt.2020.09.005
M3 - Article
AN - SCOPUS:85092095751
SN - 0921-8831
VL - 31
SP - 4253
EP - 4274
JO - Advanced Powder Technology
JF - Advanced Powder Technology
IS - 10
ER -