A dynamic model for the turbulent burning velocity for large eddy simulation of premixed combustion

2008 ◽  
Vol 154 (4) ◽  
pp. 740-760 ◽  
Author(s):  
E. Knudsen ◽  
H. Pitsch
Keyword(s):  
Large Eddy Simulation ◽  
Dynamic Model ◽  
Burning Velocity ◽  
Premixed Combustion ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Turbulent Burning Velocity

Large-Eddy Simulation of Combustion Oscillation in Premixed Combustor

1999 ◽  
Author(s):  
Tomoya Murota ◽  
Masaya Ohtsuka
Keyword(s):  
Large Eddy Simulation ◽  
Present Method ◽  
Premixed Combustion ◽  
Compressible Turbulence ◽  
Flamelet Model ◽  
Turbulent Premixed Flame ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Combustion Oscillation ◽  
Combustion Flow

To analyze combustion oscillation in the premixed combustor, a large-eddy simulation program for premixed combustion flow was developed. The subgrid scale (SGS) model of eddy viscosity type for compressible turbulence (Speziale et al., 1988) was adopted to treat the SGS fluxes. The fractal flamelet model, which utilizes the fractal properties of the turbulent premixed flame to obtain the reaction rate, was developed. Premixed combustion without oscillation was analyzed to verify the present method. The computational results showed good accordance with experimental data (Rydén et al., 1993). The combustion oscillation of an “established buzz” type in the premixed combustor (Langhorne, 1988) was also analyzed. The present method succeeded in capturing the oscillation accurately. The detailed mechanism was investigated. The appearance of the non-heat release region, which is generated because the supply of the unburnt gas into the combustion zone stagnates, and its disappearance play an important role.

scholarly journals Large Eddy Simulation of Premixed Combustion With a Thickened-Flame Approach

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
Ashoke De ◽  
Sumanta Acharya
Keyword(s):  
Large Eddy Simulation ◽  
Laminar Flame ◽  
Flame Structure ◽  
Reaction Rates ◽  
Premixed Combustion ◽  
Efficiency Function ◽  
Modeling Approach ◽  
Eddy Simulation ◽  
Reduced Chemistry ◽  
Large Eddy

A thickened-flame (TF) modeling approach is combined with a large eddy simulation (LES) methodology to model premixed combustion, and the accuracy of these model predictions is evaluated by comparing with the piloted premixed stoichiometric methane-air flame data of Chen et al. (1996, “The Detailed Flame Structure of Highly Stretched Turbulent Premixed Methane-Air Flames,” Combust. Flame, 107, pp. 233–244) at a Reynolds number Re=24,000. In the TF model, the flame front is artificially thickened to resolve it on the computational LES grid and the reaction rates are specified using reduced chemistry. The response of the thickened-flame to turbulence is taken care of by incorporating an efficiency function in the governing equations. The efficiency function depends on the characteristics of the local turbulence and on the characteristics of the premixed flame such as laminar flame speed and thickness. Three variants of the TF model are examined: the original thickened-flame model, the power-law flame-wrinkling model, and the dynamically modified TF model. Reasonable agreement is found when comparing predictions with the experimental data and with computations reported using a probability distribution function modeling approach. The results of the TF model are in better agreement with data when compared with the predictions of the G-equation approach.

scholarly journals Assessment of dynamic closure for premixed combustion large eddy simulation

2015 ◽  
Vol 19 (5) ◽  
pp. 628-656 ◽  
Author(s):  
Ivan Langella ◽  
Nedunchezhian Swaminathan ◽  
Yuan Gao ◽  
Nilanjan Chakraborty
Keyword(s):  
Large Eddy Simulation ◽  
Premixed Combustion ◽  
Eddy Simulation ◽  
Large Eddy

Review on Large Eddy Simulation of Turbulent Premixed Combustion in Tubes

2020 ◽  
Vol 29 (4) ◽  
pp. 853-867
Author(s):  
Gang Luo ◽  
Haidong Dai ◽  
Lingpeng Dai ◽  
Yunlou Qian ◽  
Ce Sha ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Premixed Combustion ◽  
Turbulent Premixed Combustion ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Turbulent Premixed
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