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Active control of crossflow-induced transition by means of in-line pneumatic actuator orifices

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Abstract

The possibility of a pneumatic actuator system for controlling the crossflow vortex-induced laminar breakdown is investigated by means of hot-wire measurements. Steady blowing or suction through a spanwise row of periodically arranged orifices initiates a system of longitudinal vortices which reduces the amplitude of the most amplified stationary crossflow vortices. Thus, the onset of high-frequency secondary instability and the following laminar–turbulent transition was shifted farther downstream. All experiments were conducted at the redesigned DLR swept flat plate experiment in the open test section of the 1 m wind tunnel at the DLR in Göttingen.

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Acknowledgments

The financial support by the German Ministry for Economic Affairs and Energy through the LuFo IV-4 project AKSA is gratefully acknowledged. Furthermore, the authors wish to thank the IAG Stuttgart for the stability analysis.

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Authors and Affiliations

  1. Department of Aerodynamics, Berlin University of Technology, Marchstrasse 12, 10587, Berlin, Germany

    J. Lohse & W. Nitsche

  2. Institute of Aerodynamics and Flow Technology, DLR, Bunsenstrasse 10, 37073, Göttingen, Germany

    H. P. Barth

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  1. J. Lohse
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  2. H. P. Barth
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  3. W. Nitsche
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Correspondence to J. Lohse.

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Lohse, J., Barth, H.P. & Nitsche, W. Active control of crossflow-induced transition by means of in-line pneumatic actuator orifices. Exp Fluids 57, 124 (2016). https://doi.org/10.1007/s00348-016-2213-x

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  • DOI: https://doi.org/10.1007/s00348-016-2213-x

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