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Experimental closed-loop control of flow separation over a plain flap using slope seeking

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Abstract

Slope seeking control is implemented to suppress flow separation occurring on a plain flap progressively deflected at \(Re_{\mathrm{c}}=2\times 10^{6}\). The flap is equipped with pulsed blowing slots that are actuated by a square signal whose duty cycle is adapted by the so-called slope seeking algorithm in order to minimise the injected momentum while maintaining the flow attached whatever the flap deflection angle. Thirteen hot-film sensors are chordwise distributed on the flap. They measure the wall shear stress fluctuations that are used to calculate in real time a series of correlation coefficients. This method constitutes a way to determine whether the flow is separated or not within the context of flow separation control. Finally, a modification of basic slope seeking algorithm is proposed to improve its convergence rate without compromising stability.

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Acknowledgments

The authors would like to acknowledge Michel Alaphilippe and Nicolas Severac for their constant and precious support, and all members of the DAFE PIV team for their help during the tomoscopy experiment.

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Authors and Affiliations

  1. Onera, The French Aerospace Lab, 8 rue des Vertugadins, 92190 , Meudon, France

    Timothée Chabert, Julien Dandois & Éric Garnier

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  1. Timothée Chabert
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  2. Julien Dandois
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  3. Éric Garnier
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Correspondence to Julien Dandois.

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Chabert, T., Dandois, J. & Garnier, É. Experimental closed-loop control of flow separation over a plain flap using slope seeking. Exp Fluids 55, 1797 (2014). https://doi.org/10.1007/s00348-014-1797-2

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  • DOI: https://doi.org/10.1007/s00348-014-1797-2

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