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Large eddy simulation and acoustic analysis of multi-burner industrial gas turbines

Staffelbach, Gabriel. Large eddy simulation and acoustic analysis of multi-burner industrial gas turbines. PhD, Institut National Polytechnique de Toulouse, 2006

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Official URL: http://ethesis.inp-toulouse.fr/archive/00000245/

Abstract

Pollutant emissions restrictions have driven gas turbine manufacturers to employ new technologies and to operate these systems in extreme operating conditions. These operating conditions produce in some cases combustion instabilities which can have dramatic effects for the turbine. Extended experimental and numerical studies are then required to analyze the possible behavior of the end design. Unfortunately tests on the real set-up are not possible and simplified cases are used. Although gas turbines can contain up to 30 burners blowing into the same annular chamber, tests in laboratories are often performed on one single burner. This simplification obviously suppresses two mechanisms: burner/burner interaction and the possibility of acoustic azimuthal modes of the full annular chamber. The objective of this thesis is to use Large Eddy Simulation (LES) to investigate whether these mechanisms are important or not. An additional issue considered is the effect of the pilot fuel injection on flame stability. First, the influence of a pilot flame on the flame stabilization of a laboratory scale burner is studied. Then, using a numerical method developed during this thesis, the impact of an azimuthal mode on a turbine is analyzed using single burner LES. A LES of a triple burner configuration is presented and the impact of the side burners on the central burner analyzed. To finish, the feasibility of full chamber LES is demonstrated.

Item Type:PhD Thesis
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Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
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Research Director:
Poinsot, Thierry
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