Journal
COMBUSTION THEORY AND MODELLING
Volume 21, Issue 2, Pages 274-292Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13647830.2016.1218054
Keywords
methane; air flame; LES; sub-grid scale viscosity models; sub-grid scale combustion models; flame-vortex interaction
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Funding
- National Natural Science Foundation of China [51274205]
- State Key Laboratory of Coal Resources and Safe Mining (China University of Mining and Technology) [SKLCRSM10KFB13]
- Key Laboratory of Building Fire Protection Engineering and Technology of MPS [KFKT2014ZD04]
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In this paper, an experimental and numerical investigation of premixed methane/air flame dynamics in a closed combustion vessel with a thin obstacle is described. In the experiment, high-speed video photography and a pressure transducer are used to study the flame shape changes and pressure dynamics. In the numerical simulation, four sub-grid scale viscosity models and three sub-grid scale combustion models are evaluated for their individual prediction compared with the experimental data. High-speed photographs show that the flame propagation process can be divided into five stages: spherical flame, finger-shaped flame, jet flame, mushroom-shaped flame and bidirectional propagation flame. Compared with the other sub-grid scale viscosity models and sub-grid scale combustion models, the dynamic Smagorinsky-Lilly model and the power-law flame wrinkling model are better able to predict the flame behaviour, respectively. Thus, coupling the dynamic Smagorinsky-Lilly model and the power-law flame wrinkling model, the numerical results demonstrate that flame shape change is a purely hydrodynamic phenomenon, and the mushroom-shaped flame and bidirectional propagation flame are the result of flame-vortex interaction. In addition, the transition from corrugated flamelets to thin reaction zones is observed in the simulation.
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