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Laser-based investigations in gas turbine model combustors

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Abstract

Dynamic processes in gas turbine (GT) combustors play a key role in flame stabilization and extinction, combustion instabilities and pollutant formation, and present a challenge for experimental as well as numerical investigations. These phenomena were investigated in two gas turbine model combustors for premixed and partially premixed CH4/air swirl flames at atmospheric pressure. Optical access through large quartz windows enabled the application of laser Raman scattering, planar laser-induced fluorescence (PLIF) of OH, particle image velocimetry (PIV) at repetition rates up to 10 kHz and the simultaneous application of OH PLIF and PIV at a repetition rate of 5 kHz. Effects of unmixedness and reaction progress in lean premixed GT flames were revealed and quantified by Raman scattering. In a thermo-acoustically unstable flame, the cyclic variation in mixture fraction and its role for the feedback mechanism of the instability are addressed. In a partially premixed oscillating swirl flame, the cyclic variations of the heat release and the flow field were characterized by chemiluminescence imaging and PIV, respectively. Using phase-correlated Raman scattering measurements, significant phase-dependent variations of the mixture fraction and fuel distributions were revealed. The flame structures and the shape of the reaction zones were visualized by planar imaging of OH distribution. The simultaneous OH PLIF/PIV high-speed measurements revealed the time history of the flow field–flame interaction and demonstrated the development of a local flame extinction event. Further, the influence of a precessing vortex core on the flame topology and its dynamics is discussed.

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Acknowledgments

The authors thank Rajesh Sadanandan for his contribution to OH LIF measurements, Adam Steinberg for the analysis of part of the high-speed measurements and Peter Weigand and Xuru Duan for the participation in the Raman experiments. The financial support within the DLR project MVS is gratefully acknowledged.

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Authors and Affiliations

  1. Institut für Verbrennungstechnik, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Pfaffenwaldring 38, 70569, Stuttgart, Germany

    W. Meier, I. Boxx & M. Stöhr

  2. Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH, 45433, USA

    C. D. Carter

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  1. W. Meier
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  2. I. Boxx
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  3. M. Stöhr
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  4. C. D. Carter
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Correspondence to W. Meier.

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Meier, W., Boxx, I., Stöhr, M. et al. Laser-based investigations in gas turbine model combustors. Exp Fluids 49, 865–882 (2010). https://doi.org/10.1007/s00348-010-0889-x

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