Nonintrusive laser-based and optical measurements were performed in a gas turbine model combustor with a lean premixed swirl-stabilized -air flame at atmospheric pressure. The main objective was to gain spatially and temporally resolved experimental data to enable the validation of numerical CFD results of oscillating flames. The investigated flame was operated at 25 kW and ϕ=0.70, and exhibited self-excited oscillations of more than 135 dB at . The applied measurement techniques were three-dimensional (3D) laser doppler velocimetry (LDV) for velocity measurements, chemiluminescence yielding information about the heat release and pointwise laser Raman scattering for the determination of joint probability density functions (PDFs) of the major species concentrations, temperature, and mixture fraction. Each of these techniques was applied with phase resolution with respect to the periodic fluctuation of the pressure in the combustion chamber that was measured with a microphone probe. The measurements finally revealed that the mixing of fuel and air in this technical premixing system was strongly affected by the pressure fluctuations leading to changes in equivalence ratio during an oscillation cycle that, in turn, induced the pressure fluctuations.
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July 2007
Technical Papers
Laser-Based Investigations of Thermoacoustic Instabilities in a Lean Premixed Gas Turbine Model Combustor
Peter Weigand,
Peter Weigand
Institute of Combustion Technology,
e-mail: peter.weigand@dlr.de
German Aerospace Center (DLR)
, Pfaffenwaldring 38-40, 70565 Stuttgart, Germany
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Wolfgang Meier,
Wolfgang Meier
Institute of Combustion Technology,
German Aerospace Center (DLR)
, Pfaffenwaldring 38-40, 70565 Stuttgart, Germany
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Xuru Duan,
Xuru Duan
Institute of Combustion Technology,
German Aerospace Center (DLR)
, Pfaffenwaldring 38-40, 70565 Stuttgart, Germany
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Manfred Aigner
Manfred Aigner
Institute of Combustion Technology,
German Aerospace Center (DLR)
, Pfaffenwaldring 38-40, 70565 Stuttgart, Germany
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Peter Weigand
Institute of Combustion Technology,
German Aerospace Center (DLR)
, Pfaffenwaldring 38-40, 70565 Stuttgart, Germanye-mail: peter.weigand@dlr.de
Wolfgang Meier
Institute of Combustion Technology,
German Aerospace Center (DLR)
, Pfaffenwaldring 38-40, 70565 Stuttgart, Germany
Xuru Duan
Institute of Combustion Technology,
German Aerospace Center (DLR)
, Pfaffenwaldring 38-40, 70565 Stuttgart, Germany
Manfred Aigner
Institute of Combustion Technology,
German Aerospace Center (DLR)
, Pfaffenwaldring 38-40, 70565 Stuttgart, GermanyJ. Eng. Gas Turbines Power. Jul 2007, 129(3): 664-671 (8 pages)
Published Online: October 16, 2006
Article history
Received:
June 9, 2006
Revised:
October 16, 2006
Citation
Weigand, P., Meier, W., Duan, X., and Aigner, M. (October 16, 2006). "Laser-Based Investigations of Thermoacoustic Instabilities in a Lean Premixed Gas Turbine Model Combustor." ASME. J. Eng. Gas Turbines Power. July 2007; 129(3): 664–671. https://doi.org/10.1115/1.2718224
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