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Instantaneous three-dimensional visualization of concentration distributions in turbulent flows with crossed-plane laser-induced fluorescence imaging

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Abstract

A laser-based technique for measuring instantaneous three-dimensional species concentration distributions in turbulent flows is presented. The laser beam from a single laser is formed into two crossed light sheets that illuminate the area of interest. The laser-induced fluorescence (LIF) signal emitted from excited species within both planes is detected with a single camera via a mirror arrangement. Image processing enables the reconstruction of the three-dimensional data set in close proximity to the cutting line of the two light sheets. Three-dimensional intensity gradients are computed and compared to the two-dimensional projections obtained from the two directly observed planes. Volume visualization by digital image processing gives unique insight into the three-dimensional structures within the turbulent processes. We apply this technique to measurements of toluene-LIF in a turbulent, non-reactive mixing process of toluene and air and to hydroxyl (OH) LIF in a turbulent methane-air flame upon excitation at 248 nm with a tunable KrF excimer laser.

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Authors and Affiliations

  1. Physikalisch-Chemisches Institut, Universität Heidelberg, 69120, Heidelberg, Germany

    A. Hoffmann & F. Zimmermann

  2. ICG-III, Forschungszentrum Jülich, 52425, Jülich, Germany

    H. Scharr

  3. IWR, Universität Heidelberg, 69120, Heidelberg, Germany

    S. Krömker

  4. IVG, Universität Duisburg-Essen, 47057, Duisburg, Germany

    C. Schulz

Authors
  1. A. Hoffmann
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  2. F. Zimmermann
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  3. H. Scharr
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  4. S. Krömker
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  5. C. Schulz
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Corresponding author

Correspondence to C. Schulz.

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PACS

42.30.Va; 32.50.+d; 42.62.Cf

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Hoffmann, A., Zimmermann, F., Scharr, H. et al. Instantaneous three-dimensional visualization of concentration distributions in turbulent flows with crossed-plane laser-induced fluorescence imaging. Appl. Phys. B 80, 125–131 (2005). https://doi.org/10.1007/s00340-004-1670-8

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  • DOI: https://doi.org/10.1007/s00340-004-1670-8

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