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Analysis of flow and density oscillations in a swirl-stabilized flame employing highly resolving optical measurement techniques

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Abstract

Modern aircraft engines operate with a reduced core air mass flow, which is challenging regarding an efficient and most of all stable combustion of fuel. A variable geometry burner investigated here allows a stable lean combustion with lower air mass flow rate than with a fixed geometry. In order to optimize such burners further, the occurring flame instabilities have to be investigated. This requires optical measurement techniques with a high measurement rate and an insensitivity regarding flame glow. Concerning flow velocity measurements, the frequency modulated Doppler global velocimetry (FM-DGV) fulfills these demands. In the swirl-stabilized flame of the variable geometry burner, spectra up to 2.5 kHz of the flow velocity field were obtained with FM-DGV. For example, a resonance peak at about 255 Hz was identified in the swirled flame, which also occurs in complementing density measurements by laser interferometric vibrometry. The combined analysis of velocity and density oscillations offer new insights into the physics of flame flows.

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Acknowledgments

The authors thank the Deutsche Forschungsgemeinschaft (DFG project Cz 55/22-1) and the Austrian Science Fund (FWF project 24096-N24) for their financial support.

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Authors and Affiliations

  1. Laboratory for Measurement and Testing Techniques, Department of Electrical Engineering and Information Technology, Technische Universität Dresden, Helmholtzstr. 18, 01062, Dresden, Germany

    Andreas Fischer, Jörg König & Jürgen Czarske

  2. Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Inffeldgasse 25A, 8010, Graz, Austria

    Johannes Peterleithner, Jakob Woisetschläger & Thomas Leitgeb

Authors
  1. Andreas Fischer
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  2. Jörg König
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  3. Jürgen Czarske
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  4. Johannes Peterleithner
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  5. Jakob Woisetschläger
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  6. Thomas Leitgeb
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Correspondence to Andreas Fischer.

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Fischer, A., König, J., Czarske, J. et al. Analysis of flow and density oscillations in a swirl-stabilized flame employing highly resolving optical measurement techniques. Exp Fluids 54, 1622 (2013). https://doi.org/10.1007/s00348-013-1622-3

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  • DOI: https://doi.org/10.1007/s00348-013-1622-3

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