PhD defense - P. Wolf

Large Eddy Simulation of thermoacoustic instabilities in annular combustion chambers

Delivered by Institut Nationale Polytechnique de Toulouse
Speciality: Fluid Dynamics

November 21, 2011 - CERFACS

Increasingly stringent regulations and the need to tackle rising fuel prices have placed great emphasis on the design of aeronautical gas turbines. This drive towards innovation has resulted sometimes in new concepts being prone to combustion instabilities. Combustion instabilities arise from the coupling of acoustics and combustion. In the particular field of annular combustion chambers, these instabilities often take the form of azimuthal modes. To predict these modes, one must consider the full combustion chamber, which, in the numerical simulation domain, remained out of reach until very recently and the development of massively parallel computers. In this work, azimuthal modes that may develop in annular combustors are studied with different numerical approaches: a low order model, a 3D Helmholtz solver and Large Eddy Simulations. Combining these methods allows a better understanding of the structure of the instabilities and may provide guidelines to build intrinsically stable combustion chambers.

W. Polifke	TU München	Referee
S. Ducruix	Ecole Centrale de Paris	Referee
O. Paschereit	TU Berlin	Member
T. Lederlin	Turbomeca	Member
F. Nicoud	University of Montpellier	Member
M. Cazalens	SNECMA	Member
L. Gicquel	CERFACS	Advisor
G.Staffelbach	CERFACS	Co advisor

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