Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18618
Title: Large eddy simulation of coherent structures in rectangular methane non-premixed flame
Authors: Guo, YC
Jiang, P
Chan, CK 
Lin, WY
Keywords: Coherent structure
Large eddy simulation
Non-premixed flame
Rectangular jets
Issue Date: 2011
Publisher: North-Holland
Source: Journal of computational and applied mathematics, 2011, v. 235, no. 13, p. 3760-3767 How to cite?
Journal: Journal of computational and applied mathematics 
Abstract: Large eddy simulation of a three-dimensional spatially developing transitional free methane non-premixed flame is performed. The solver of the governing equations is based upon a projection method. The Smagorinsky model is utilized for the turbulent subgrid scale terms. A global reaction mechanism is applied for the simulation of methane/air combustion. Simulation results clearly illustrate the coherent structure of the rectangular non-premixed flame, consisting of three distinct zones in the near field. Periodic characteristics of the coherent structures in the rectangular non-premixed flame are discussed. The predicted structure of the flame is in good agreement with the experimental results. Distributions of species concentrations across the flame surfaces are illustrated and typical flame structures in the far field are analyzed. Local mass fraction analysis and flow visualization indicate that the black spots of the flames are due to strong entrainment of oxygen into the central jet by streamwise vortices, and breaking up of the flame is caused by an enormous amount of entrainment of streamwise vortices as well as stretching of spanwise vortices at the bottom of the flame.
URI: http://hdl.handle.net/10397/18618
ISSN: 0377-0427
EISSN: 1879-1778
DOI: 10.1016/j.cam.2011.01.022
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