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

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Author

  • Christophe Duwig
  • Laszlo Fuchs

Summary, in English

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.

Department/s

Publishing year

2004

Language

English

Pages

129-136

Publication/Series

Proceedings of the ASME Turbo Expo 2004

Volume

1

Document type

Conference paper

Publisher

American Society Of Mechanical Engineers (ASME)

Topic

  • Fluid Mechanics and Acoustics

Keywords

  • Combustion coupling
  • Pre-vaporized combustors
  • Thermo-acoustic sources
  • Flame dynamics

Conference name

2004 ASME Turbo Expo

Conference date

2004-06-14 - 2004-06-17

Conference place

Vienna, Austria

Status

Published