In order to reduce the dimensions of the combustor, swirl stabilized flames are used in heavy duty gas turbines. In our recent investigation of the swirling flow at a single heavy duty gas turbine burner under nonreacting conditions typical instabilities like precessing vortex cores and vortex shedding have been found (Schildmacher et al., Proceedings of the 6th European Conference on Industrial Furnaces and Boilers). In the present paper the experimental investigations will be discussed. Combustion instabilities have been analyzed by phase-locked laser doppler anemometer measurements. For the reacting flow, also combustion instabilities could be detected. The amplitude increases strongly with the equivalence ratio. The frequency of the oscillations for reacting conditions has been found to be slightly shifted towards lower frequencies compared to those of the corresponding nonreacting flow. In addition, for the reacting flow a linear and nonlinear range of oscillations could be discriminated.

Issue Section:
Gas Turbines: Combustion and Fuel
Keywords:
laser Doppler anemometry, vortices, gas turbines, combustion, fluid oscillations
Topics:
Combustion, Flow (Dynamics), Oscillations, Fluctuations (Physics), Vortices
1.
Lefebvre, A. H., 1974, “Pollution Control in Continuous Combustion Engines,” Fifteenth Symposium on Combustion, Combustion Inst., Pittsburgh, pp. 1169–1180.
2.
Kraemer, H., Dinkelacker, F., Huth, M., Leipertz, A., Poeschl, G., and Lenze, M., 1999, “Optimization of the Mixing Quality of a Real Size Gas Turbine Burner With Instantaneous Planar Laser-Induced Fluorescence Imaging,” ASME Paper No. 99-GT-135.
3.
Coats
,
C. M.
,
1996
, “
Coherent Structures in Combustion
,”
Prog. Energy Combust. Sci.
,
22
, pp.
427
–
509
.
4.
Gupta, A. K., Lilley, D. G., and Syred, N., 1984, “Swirl Flows,” ABACUS Press.
5.
Gutmark
,
E. J.
,
Shadow
,
K. C.
, and
Yu
,
K. H.
,
1994
, “
Methods for Enhanced Turbulence Mixing in Supersonic Shear Flows
,”
Appl. Mech. Rev.
,
47
(
2
), pp.
375
–
417
.
6.
Prade, B., Streb, H., Berenbrink, P., Schetter, B., and Pyka, G., 1996, “Development of an Improved Hybrid Burner—Initial Operating Experience in a Gas Turbine,” ASME Paper No. 96-GT-43.
7.
Schildmacher, K.-U., Koch, R., Krebs, W., Hoffmann, S., and Wittig, S., 2002, “Experimental Investigation of Unsteady Flow Phenomena in High Intense Combustion Systems,” Proceedings of the 6th European Conference on Industrial Furnaces and Boilers.
8.
Loseke, A. H., and Gould, R. D., 1991, “A Comparison of Velocity Bias Correction Techniques in Laser-Doppler-Velocimetry,” ASME Fluid Measurement and Instrumentation Forum, 108, pp. 63–68.
9.
McLaughlin, D. K., and Tiedermann, W. G., 1973, “Biasing Correction for Individual Realization of Laser-Doppler-Anemometer Measurements in Turbulent Flow,” The Physics of Flow, 16, pp. 2082–2088.
10.
Schildmacher, K.-U., Koch, R., Krebs, W., Hoffmann, S., and Wittig, S., 2000, “Experimental Investigations of the Temporal Air-Fuel Mixing Fluctuations and Cold Flow Instabilities of a Premixing Gas Turbine Burner,” ASME Paper No. 2000-GT-0084.
11.
Schlueter, J., Schoenfeld, T., Poinsot, T., Krebs, W., and Hoffmann, S., 2001, “Characterization of Confined Swirl Flows Using Large Eddy Simulations,” ASME Paper No. 2001-GT-0060.
12.
Host-Madsen, A., 1994, “A New Method for Estimation of Turbulence Spectra for Laser Doppler Anemometry,” 7th International Symposium on Applications of Laser Techniques of Fluid Mechanics, Lisbon.
13.
Host-Madsen
,
A.
, and
Caspersen
,
C.
,
1981
, “
Spectral Analysis—A Modern Perspective
,”
Proc. IEEE
,
69
(
11
), pp.
1380
–
1419
.
14.
Laufer
,
J.
, and
Monkewitz
,
P.
,
1978
, “
The Influence of the Dominant Large Scale Structures on the Initial Instability of a Low-Speed Circular Jet
,”
Bull. Am. Phys. Soc.
,
23
, p.
1008
1008
.
Copyright © 2005
 by ASME
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