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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuel

Detailed Analysis of the Acoustic Mode Shapes of an Annular Combustion Chamber

[+] Author and Article Information
G. Walz, W. Krebs, S. Hoffmann, H. Judith

Siemens AG KWU, Wiesenstr. 35, D-45466 Mülheim, Germany

J. Eng. Gas Turbines Power 124(1), 3-9 (Mar 01, 1999) (7 pages) doi:10.1115/1.1396346 History: Received October 01, 1998; Revised March 01, 1999
Copyright © 2002 by ASME
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References

Becker, B., Schulenberg, T., and Termuehlen, H., 1995, “The 3A-Series Gas Turbines With HBR™ Combustors,” ASME Paper 95-GT-458.
Samaniego,  J. M., Yip,  B., Poinsot,  T., and Candel,  S., 1993, “Low Frequency Combustion Instability Mechanism in a Side-Dump Combustor,” Combust. Flame, 94, pp. 363–380.
Paschereit, C. O., and Polifke, W., 1998, “Investigation of the Thermoacoustic Characteristics of a Lean Premixed Gas Turbine Burner,” ASME Paper 98-GT-582.
Prade, B., Streb, H., Berenbrinck, P., Schetter, B., and Pyka, G., 1996, “Development of an Improved Hybrid Burner—Initial Operating Experience in a Gas Turbine,” ASME Paper 96-GT-45.
Morse, P. M., and Ingard, K. U., 1986, Theoretical Acoustics, Princeton University Press, Princeton, NJ.
Hibbitt, Karlson & Sorenson, Inc., 1997, ABAQUS User’s Manual Version 5.7.
Krebs, W., Walz, G., Hoffmann, S., and Judith, H., 1999, “Detailed Analysis of the Thermal Wall Heat Load in Annular Combustors,” ASME TURBO EXPO, submitted for presentation.

Figures

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Cross section of the V83.3A gas turbine
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Eigenfrequency spectrum of the cylinder model. The limit curve is given by N=(ω/ω0)3 (see Eq. (4)).
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Examples of eigenmodes of the cylinder model: mode N=29 (left) and N=39 (right). The eigenmodes are characterized by the normalized pressure distribution.
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Geometry and finite element model of the annual combustor
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Distribution of the speed of sound normalized to its maximum value c0 in the z=0 m plane (CFD calculation (7))
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Selected eigenmodes of the annular combustor with boundary conditions of Problem II. The pictures show the normalized pressure distribution.
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Selected eigenmodes of the annular combustor with boundary conditions of Problem III. The normalized pressure distribution is shown.

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