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Detection of Lambda- and Omega-vortices with the temperature-sensitive paint method in the late stage of controlled laminar–turbulent transition

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Abstract

An experiment investigating the laminar–turbulent transition of a Blasius boundary-layer-like flow was set up in the laminar water channel at the Institute of Aerodynamics and Gas Dynamics, University of Stuttgart. The late stage of controlled transition with K-type breakdown was investigated with the temperature-sensitive paint (TSP) method on the flat-plate surface. Additional velocity measurements in the boundary layer were performed with the hot-film anemometry for better interpretation of the TSP results. The test conditions enable the TSP method to resolve the complete transition process temporally and spatially. Therefore, it was possible to detect the coherent structures occurring in the late stage of laminar–turbulent transition from the visualizations on the flat-plate surface: namely, \(\varLambda\)- and \(\varOmega\)-vortices. The transition location is derived from the TSP visualizations with a gradient-based method and with the Turbulence Energy Recognition Algorithm (TERA) from the velocity measurements. The derived average transition location shows good agreement between the two techniques, but the TSP method detected a later beginning and earlier end of transition.

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Acknowledgements

The authors would like to thank Mr. Carsten Fuchs (DLR-AS-EXV), Mr. Tobias Kleindienst (DLR-AS-EXV), Dr. Vladimir Ondrus (University of Hohenheim), Ms. Esther Mäteling (RWTH Aachen University), and Mr. Martin Weberschock (Weberschock Development) for their support during the design, manufacturing, and preparation of the TSP element. We thank Mr. Daniel Kruse (University of Stuttgart) for measuring the boundary-layer stability behavior of the laminar water channel.

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Authors and Affiliations

  1. Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany

    Jonathan Lemarechal, Christian Klein & Ulrich Henne

  2. Institute for Aerodynamics and Gas Dynamics, University of Stuttgart, Pfaffenwaldring 21, 70569, Stuttgart, Germany

    Dominik K. Puckert & Ulrich Rist

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  1. Jonathan Lemarechal
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  2. Christian Klein
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  3. Ulrich Henne
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  4. Dominik K. Puckert
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  5. Ulrich Rist
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Correspondence to Jonathan Lemarechal.

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Lemarechal, J., Klein, C., Henne, U. et al. Detection of Lambda- and Omega-vortices with the temperature-sensitive paint method in the late stage of controlled laminar–turbulent transition. Exp Fluids 60, 91 (2019). https://doi.org/10.1007/s00348-019-2734-1

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