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Development, verification and validation of LES tools for the study of combustion noise and combustion-acoustic-turbulence interaction

Porta, Mauro. Development, verification and validation of LES tools for the study of combustion noise and combustion-acoustic-turbulence interaction. PhD, Institut National Polytechnique de Toulouse, 2007

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Official URL: http://ethesis.inp-toulouse.fr/archive/00000507/

Abstract

In the last years, constraints on pollutants emissions for gas turbines have become more and more severe. In order to fulfill these requirements, gas turbines manufacturers developed combustion systems operating at very lean regimes. Unfortunately, burners working under these conditions can exhibit strong thermo-acoustical instabilities leading to serious damages or even to the complete destruction of the combustion system. Large Eddy Simulation (LES) is nowadays considered as the most promising CFD tool for the study of combustion instabilities. Its intrinsic unsteadiness and the capability of directly solving the motion of the largest vortices and acoustic waves propagation, enable LES to analyze the strong interactions between turbulence, chemical species mixing, acoustics and chemical reactions, which are the primary sources of combustion instabilities. However, the exact precision and the limitations of LES remain to be determined in particular for the prediction of combustion noise and self-excited combustion instabilities. Therefore, in this work the ability of the LES code AVBP of CERFACS to accurately compute simple configurations involving only one phisical phenomenon (turbulence, acoustics or combustion) is firstly verified. Reactive and non-reactive academical test cases, for which the analytical solutions are known, are presented putting special emphasis on the influence of the numerical discretization and on its interaction with boundary conditions. Then, having gained confidence in the LES tool, the results obtained from a self-excited computation of a lab-scale burner are shown

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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