Large-eddy structures of turbulent swirling flows and methane-air swirling diffusion combustion |
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Authors: | Liyuan?Hu Email author" target="_blank">Lixing?ZhouEmail author Jian?Zhang |
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Institution: | (1) Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China |
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Abstract: | Turbulent swirling flows and methane-air swirling diffusion combustion are studied by large-eddy simulation (LES) using a
Smagorinsky-Lilly subgrid scale turbulence model and a second-order moment (SOM) SGS combustion model, and also by RANS modeling
using the Reynolds Stress equation model with the IPCM+wall and IPCM pressure-strain models and SOM combustion model. The
LES statistical results for swirling flows give good agreement with the experimental results, indicating that the adopted
subgrid-scale turbulence model is suitable for swirling flows. The LES instantaneous results show the complex vortex shedding
pattern in swirling flows. The initially formed large vortex structures soon break up in swirling flows. The LES statistical
results of combustion modeling are near the experimental results and are as good as the RANS-SOM modeling results. The LES
results show that the size and range of large vortex structures in swirling combustion are different from those of isothermal
swirling flows, and the chemical reaction is intensified by the large-eddy vortex structures.
The project supported by the Special Funds for Major State Basic Research (G-1999-0222-07). The English text was polished
by Keren Wang. |
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Keywords: | Swirling combustion Swirling flows Large-eddy simulation |
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