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Subject Keyword Abstract Author
 
 
Large eddy simulation of turbulent premixed combustion flow around bluff body

Nam Seob Park and Sang Cheol Ko*
The Journal of Mechanical Science and Technology, vol. 25, no. 9, pp.2227-2235, 2011

Abstract : Large eddy simulation (LES) of turbulent premixed flame stabilized by the bluff body is developed by using sub-grid scale combustion model based on the G-equation describing the flame front propagation. The basic idea of LES modeling is to evaluate the filtered-front speed, which should be enhanced in the grid scale by the scale fluctuations. The dynamic sub-grid scale models newly introduced into the G-equation are validated by the premixed combustion flow behind the triangle flame holder. The objective of this study is to investigate the validity of the dynamic sub-grid G-equation model to a complex turbulent premixed combustion such as bluff body stabilized turbulent premixed flames for realistic engineering application. A new turbulent flame speed model, introduced by the sub-grid turbulent diffusivity and the flame thickness, is also proposed and is compared with the usual model using sub-grid turbulent intensity and with the experimental data. The calculated results can predict the velocity and temperature of the combustion flow in good agreement with the experiment data.

Keyword : Large eddy simulation; Turbulent premixed flame; Dynamic sub-grid G-equation model; Bluff body; Turbulent flame speed

 
 
 
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