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In-flight active wave cancelation with delayed-x-LMS control algorithm in a laminar boundary layer

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Abstract

This manuscript demonstrates the first successful application of the delayed-x-LMS (dxLMS) control algorithm for TS-wave cancelation. Active wave cancelation of two-dimensional broadband Tollmien–Schlichting (TS) disturbances is performed with a single DBD plasma actuator. The experiments are conducted in flight on the pressure side of a laminar flow wing glove, mounted on a manned glider. The stability properties of the controller are investigated in detail with experimental flight data, DNS and stability analysis of the boundary layer. Finally, a model-free approach for dxLMS operation is introduced to operate the controller as a ‘black-box’ system, which automatically adjusts the controller settings based on a group speed measurement of the disturbance wave packets. The modified dxLMS controller is operated without a model and is able to adapt to varying conditions that may occur during flight in atmosphere.

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Acknowledgments

This work was supported by the German research foundation (DFG) under the Grant No.GR3524/4-1. Simulations have been performed at the National Supercomputer Centre (NSC) with computer time granted by the Swedish National Infrastructure for Computing (SNIC). We also wish to thank Jens Rohlfing from Fraunhofer LBF (Darmstadt) for the fruitful discussions. Finally we appreciate the support of our student and flight test pilot Tobias Hofmann.

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Authors and Affiliations

  1. Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Flughafenstraße 19, 64347, Griesheim, Germany

    Bernhard Simon & Timotheus Nemitz

  2. Linné FLOW Centre, KTH Mechanics, 10044, Stockholm, Sweden

    Nicolò Fabbiane, Shervin Bagheri & Dan S. Henningson

  3. Department of Fluid Mechanics, University of Rostock, Rostock, Germany

    Sven Grundmann

Authors
  1. Bernhard Simon
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  2. Nicolò Fabbiane
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  3. Timotheus Nemitz
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  4. Shervin Bagheri
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  5. Dan S. Henningson
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  6. Sven Grundmann
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Correspondence to Bernhard Simon.

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Simon, B., Fabbiane, N., Nemitz, T. et al. In-flight active wave cancelation with delayed-x-LMS control algorithm in a laminar boundary layer. Exp Fluids 57, 160 (2016). https://doi.org/10.1007/s00348-016-2242-5

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  • DOI: https://doi.org/10.1007/s00348-016-2242-5

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