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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Fluid-Structure Interaction in Combustion System of a Gas Turbine—Effect of Liner Vibrations

[+] Author and Article Information
A. K. Pozarlik

Laboratory of Thermal Engineering,
University of Twente,
P.O. Box 217,
Enschede 7500 AE, Netherlands
e-mail: a.k.pozarlik@utwente.nl

J. B. W. Kok

Laboratory of Thermal Engineering,
University of Twente,
P.O. Box 217,
Enschede 7500 AE, Netherlands

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 8, 2013; final manuscript received February 11, 2014; published online March 21, 2014. Assoc. Editor: Joseph Zelina.

J. Eng. Gas Turbines Power 136(9), 091502 (Mar 21, 2014) (10 pages) Paper No: GTP-13-1407; doi: 10.1115/1.4026904 History: Received November 08, 2013; Revised February 11, 2014

Prediction of mutual interaction between flow, combustion, acoustic, and vibration phenomena occurring in a combustion chamber is crucial for the reliable operation of any combustion device. In this paper, this is studied with application to the combustion chamber of a gas turbine. Very dangerous for the integrity of a gas turbine structure can be the coupling between unsteady heat release by the flame, acoustic wave propagation, and liner vibrations. This can lead to a closed-loop feedback system resulting in mechanical failure of the combustor liner due to fatigue and fatal damage to the turbine. Experimental and numerical investigations of the process are performed on a pressurized laboratory-scale combustor. To take into account interaction between reacting flow, acoustics, and vibrations of a liner, the computational fluid dynamics (CFD) and computational structural dynamics (CSD) calculations are combined into one calculation process using a partitioning technique. Computed pressure fluctuations inside the combustion chamber and associated liner vibrations are validated with experiments performed at the state-of-the-art pressurized combustion setup. Three liner structures with different thicknesses are studied. The numerical results agree well with the experimental data. The research shows that the combustion instabilities can be amplified by vibrating walls. The modeling approach discussed in this paper allows to decrease the risk of the gas turbine failure by prediction, for given operating conditions, of the hazardous frequency at which the thermoacoustic instabilities appear.

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References

Figures

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Fig. 1

Combustion setup configuration (left) with bottom part of the liner (right)

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Fig. 2

Location of the vibration measurements inside the flexible section

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Fig. 3

Geometry and boundary conditions for CFD (top) and CSD (bottom) analysis

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Fig. 4

Weak coupling algorithm

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Fig. 5

Displacements comparison on the fluid and structure side

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Fig. 6

Acoustic modes and eigenfrequencies of the combustion chamber

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Fig. 7

Structural modes coupled with second acoustic mode

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Fig. 8

Comparison of the numerical results with experimental data for the rigid (Desire) liner configuration

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Fig. 9

Comparison of the experimental and numerical results of the pressure and velocity signal in time and frequency domain for the flexible liner configuration

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Fig. 10

Numerical results of the pressure and velocity signal in time and frequency domain for the uniform liner configuration

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