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

On the Use of Thermoacoustic Analysis for Robust Burner Design

[+] Author and Article Information
Valter Bellucci1

 ALSTOM, CH-5401 Baden, Switzerland

Dariusz Nowak, Weiqun Geng, Christian Steinbach

 ALSTOM, CH-5401 Baden, Switzerland

1

Present address: Combustion Research Laboratory, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.

J. Eng. Gas Turbines Power 130(3), 031506 (Apr 03, 2008) (6 pages) doi:10.1115/1.2800348 History: Received May 23, 2007; Revised June 13, 2007; Published April 03, 2008

Advanced thermoacoustic analysis is now routinely used in gas turbine combustor development. A thermoacoustic approach based on a combination of numerical analysis (CFD and three-dimensional acoustics), acoustic network models, and dedicated measurements of acoustic flame response is well accepted across the industry. However, its application to specific combustor upgrade or development programs in “prediction mode” as opposed to “analysis mode” remains a challenge. This is mainly due to the large sensitivity of the complex methodology to key inputs, such as flame transfer functions, that can be only predicted in the burner design phase. This paper discusses an example where we made an effort to apply the thermoacoustic approach in predictive mode. The example refers to the upgrade of a first generation diffusion burner with a partially premix burner to achieve low emissions. Thermoacoustic instabilities were predicted as a limiting factor for combustor operation and thus a design parameter was identified to perform the thermoacoustic combustor tuning at engine level. A particular challenge of this development program was that no test rig was available. Therefore, the new premix burner was directly installed into a field engine where it was successfully tested.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 2

EV burner principle

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Figure 3

LEV single burner

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Figure 4

LEV burner concept

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Figure 5

Thermoacoustic network

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Figure 6

FEM models of engine hood with SDB and LEV burner

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Figure 7

Acoustic modes of SDB and LEV combustor

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Figure 8

Pressure pulsations in SDB combustor: engine measurements versus TA3 network simulations

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Figure 9

Pressure pulsations in LEV combustor: TA3 network simulations with minimum and maximum heat release saturations for the three axial lance positions L1, L2 and Lopt(L1<Lopt<L2)

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Figure 10

Pressure pulsations in LEV combustor: engine tests for axial lance positions L1 and Lopt

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Figure 11

NOx emissions from engine tests (no water injection): SDB versus LEV with axial lance position Lopt

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Figure 12

Pressure pulsations in LEV combustor: TA3 network simulations for axial lance positions L1 and Lopt

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