scholarly journals Impact of the chemical description on a Large Eddy Simulation of a lean partially premixed swirled flame

2013 ◽  
Vol 341 (1-2) ◽  
pp. 247-256 ◽  
Author(s):  
Benedetta Franzelli ◽  
Eleonore Riber ◽  
Bénédicte Cuenot
Keyword(s):  
Large Eddy Simulation ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Partially Premixed ◽  
Chemical Description

Large Eddy Simulation of a Lean Gas Turbine Model Combustor

2009 ◽  
Author(s):  
M. Staufer ◽  
J. Janicka
Keyword(s):  
Experimental Data ◽  
Large Eddy Simulation ◽  
Flame Surface ◽  
Eddy Simulation ◽  
Partially Premixed Combustion ◽  
Large Eddy ◽  
Partially Premixed ◽  
Partially Premixed Flame ◽  
Presumed Pdf ◽  
Pdf Model

Partially premixed flames although common on many technical devices are difficult to model in numerical simulations. In this paper a Large Eddy Simulation of a lean combustor is presented. To account for mixing effects in case of partially premixed combustion, a suitable extension to the well known coherent flame model (CFM) is applied. The turbulent reaction rate of the partially premixed flame is approximated by solving an additional transport equation for the flame surface density which accounts for flame wrinkling effects as well as for the creation and destruction of flame surface due to stretch and strain effects. The variation of stoichiometry in the flame is accounted for by using a suitable presumed PDF methodology. The pdf-model represents finite rate, as well as non-equilibrium chemistry effects in the flame. The model has been validated against experimental data. The results show an overall reasonable agreement with experimental data, both in profile shapes as well as peak values.

A Large-Eddy Simulation–Linear-Eddy Model Study of Preferential Diffusion Processes in a Partially Premixed Swirling Combustor With Synthesis Gases

2016 ◽  
Vol 139 (3) ◽  
Author(s):  
Shaoshuai Li ◽  
Yunzhe Zheng ◽  
Daniel Mira ◽  
Suhui Li ◽  
Min Zhu ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Molecular Diffusion ◽  
Diffusion Processes ◽  
Combustion Dynamics ◽  
Jet Flame ◽  
Eddy Simulation ◽  
Preferential Diffusion ◽  
Large Eddy ◽  
Partially Premixed ◽  
Linear Eddy Model

A lean partially premixed swirling combustor operated with synthesis gases is studied using large-eddy simulation (LES). The linear-eddy model (LEM) is employed to close the unresolved scalar fluxes with the nonunity Lewis number assumption. Several terms resulting from the LES filtering operation are not modeled but directly resolved considering their unique length and time scales, such as molecular diffusion, scalar mixing, and chemical reactions. First, the validation results on a well-established jet flame indicate a good level of correlation with the experimental data and allow a further analysis of syngas combustion on a practical combustor. Second, the effects of preferential diffusion on the characteristics of flow and combustion dynamics on a lean partially premixed swirling combustor are investigated. The obtained results are expected to provide useful information for the design and operation of gas turbine combustion systems using syngas fuels.

scholarly journals Large-eddy simulation of flow and combustion dynamics in a lean partially premixed swirling combustor

2017 ◽  
Vol 90 (1) ◽  
pp. 120-131 ◽  
Author(s):  
Shaoshuai Li ◽  
Yunzhe Zheng ◽  
Min Zhu ◽  
Daniel Mira Martinez ◽  
Xi Jiang
Keyword(s):  
Large Eddy Simulation ◽  
Combustion Dynamics ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Partially Premixed
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