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Acoustic waves in combustion devices : interactions with flames and boundary conditions

Douasbin, Quentin. Acoustic waves in combustion devices : interactions with flames and boundary conditions. PhD, Energétique et Transferts, Institut National Polytechnique de Toulouse, 2018

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Abstract

Combustion devices are prone to combustion instabilities. They arise from a constructive coupling between the unsteady heat release rate of the flame and the resonant acoustic modes of the entire system. The occurence of such instabilities can pose a threat to both performance and integrity of combustion systems. Although these phenomena have been known for more than a century, avoiding their appearance in industrial engines is still challenging. The objective of this thesis is threefold: (1) study the dynamics of the resonant acoustic modes, (2) investigate the flame response of a liquid rocket engine under unstable conditions using Large Eddy Simulation(LES) and (3) derive, use and study Time Domain Impedance Boundary Conditions (TDIBCs), i.e. boundary conditions modeling complex acoustic impedances.

Item Type:PhD Thesis
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
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Research Director:
Poinsot, Thierry and Selle, Laurent
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Deposited On:27 Jun 2018 12:22

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