NDLI: Thermoacoustic Modeling of a Gas Turbine Combustor Equipped With Acoustic Dampers

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Bellucci, Valter Schuermans, Bruno Nowak, Dariusz Flohr, Peter Paschereit, Christian Oliver
Copyright Year	2004
Abstract	In this work, the TA3 thermoacoustic network is presented and used to simulate acoustic pulsations occurring in a heavy-duty ALSTOM gas turbine. In our approach, the combustion system is represented as a network of acoustic elements corresponding to hood, burners, flames and combustor. The multi-burner arrangement is modeled by describing hood and combustor as Multiple Input Multiple Output (MIMO) acoustic elements. The MIMO transfer function (linking acoustic pressures and acoustic velocities at burner locations) is obtained by a three-dimensional modal analysis performed with a Finite Element Method. Burner and flame analytical models are fitted to transfer function measurements. In particular, the flame transfer function model is based on the time-lag concept, where the phase shift between heat release and acoustic pressure depends on the time necessary for the mixture fraction (formed at the injector location) to be convected to the flame. By using a state-space approach, the time domain solution of the acoustic field is obtained. The nonlinearity limiting the pulsation amplitude growth is provided by a fuel saturation term. Furthermore, Helmholtz dampers applied to the gas turbine combustor are acoustically modeled and included in the TA3 model. Finally, the predicted noise reduction is compared to that achieved in the engine.
Sponsorship	International Gas Turbine Institute
Starting Page	635
Ending Page	644
Page Count	10
File Format	PDF
ISBN	0791841669
DOI	10.1115/GT2004-53977
e-ISBN	0791837394
Volume Number	Volume 1: Turbo Expo 2004
Conference Proceedings	ASME Turbo Expo 2004: Power for Land, Sea, and Air
Language	English
Publisher Date	2004-06-14
Publisher Place	Vienna, Austria
Access Restriction	Subscribed
Subject Keyword	Dampers Modal analysis Phase shift Transfer functions Acoustics Finite element methods Fuels Modeling Noise control Engines Sound pressure Flames Heat Gas turbines Ejectors Combustion systems Combustion chambers
Content Type	Text
Resource Type	Article

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