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Study of a gas turbine combustion chamber: Influence of the mixing on the flame dynamics

Duwig, Christophe LU and Fuchs, Laszlo LU (2004) 2004 ASME Turbo Expo In Proceedings of the ASME Turbo Expo 2004 1. p.129-136
Abstract
The new challenge of the Gas Turbine industry is to develop new technologies for meeting electricity demand growth and reducing harmful emissions. Thus a better understanding of the combustion phenomenon and an improvement in simulation capabilities are needed. Large Eddy Simulation tools brought the hope of meeting these two conditions and enabling the design of safe and clean burners. In the present paper, the influence of the unsteady mixing on the flame in a Lean Premixed Pre-vaporized combustor have been investigated. A premixed combustion flamelet model has been extended to non-uniform fuel/air mixtures cases. Extra terms in the equations, their effects and the modeling issues are discussed. Additionally, the effects of mixing on the... (More)
The new challenge of the Gas Turbine industry is to develop new technologies for meeting electricity demand growth and reducing harmful emissions. Thus a better understanding of the combustion phenomenon and an improvement in simulation capabilities are needed. Large Eddy Simulation tools brought the hope of meeting these two conditions and enabling the design of safe and clean burners. In the present paper, the influence of the unsteady mixing on the flame in a Lean Premixed Pre-vaporized combustor have been investigated. A premixed combustion flamelet model has been extended to non-uniform fuel/air mixtures cases. Extra terms in the equations, their effects and the modeling issues are discussed. Additionally, the effects of mixing on the flow field in an industrial gas turbine combustion chamber have been investigated. The mean flow field has been found to be weakly sensitive to the mixing effects. It is deduced that the modeling of the mixing and the combustion can be decoupled in the RANS framework. Regarding the flame dynamics, all runs show similar characteristic frequencies. However, different details of models lead to differences in the temperature fluctuations. This suggests that a rigorous modeling of the thermo-acoustic sources (e.g. heat-release fluctuations) requires accurate modeling of the mixing/ combustion coupling, for handling accurately the dynamics of the flame. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Combustion coupling, Pre-vaporized combustors, Thermo-acoustic sources, Flame dynamics
in
Proceedings of the ASME Turbo Expo 2004
volume
1
pages
129 - 136
publisher
American Society Of Mechanical Engineers (ASME)
conference name
2004 ASME Turbo Expo
external identifiers
  • Scopus:10244242637
language
English
LU publication?
yes
id
9d3e3f51-c287-45d9-8d55-80978f63461b (old id 614950)
date added to LUP
2007-11-26 18:03:14
date last changed
2016-10-13 04:38:38
@misc{9d3e3f51-c287-45d9-8d55-80978f63461b,
  abstract     = {The new challenge of the Gas Turbine industry is to develop new technologies for meeting electricity demand growth and reducing harmful emissions. Thus a better understanding of the combustion phenomenon and an improvement in simulation capabilities are needed. Large Eddy Simulation tools brought the hope of meeting these two conditions and enabling the design of safe and clean burners. In the present paper, the influence of the unsteady mixing on the flame in a Lean Premixed Pre-vaporized combustor have been investigated. A premixed combustion flamelet model has been extended to non-uniform fuel/air mixtures cases. Extra terms in the equations, their effects and the modeling issues are discussed. Additionally, the effects of mixing on the flow field in an industrial gas turbine combustion chamber have been investigated. The mean flow field has been found to be weakly sensitive to the mixing effects. It is deduced that the modeling of the mixing and the combustion can be decoupled in the RANS framework. Regarding the flame dynamics, all runs show similar characteristic frequencies. However, different details of models lead to differences in the temperature fluctuations. This suggests that a rigorous modeling of the thermo-acoustic sources (e.g. heat-release fluctuations) requires accurate modeling of the mixing/ combustion coupling, for handling accurately the dynamics of the flame.},
  author       = {Duwig, Christophe and Fuchs, Laszlo},
  keyword      = {Combustion coupling,Pre-vaporized combustors,Thermo-acoustic sources,Flame dynamics},
  language     = {eng},
  pages        = {129--136},
  publisher    = {ARRAY(0x6967040)},
  series       = {Proceedings of the ASME Turbo Expo 2004},
  title        = {Study of a gas turbine combustion chamber: Influence of the mixing on the flame dynamics},
  volume       = {1},
  year         = {2004},
}