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Duty cycle and directional jet effects of a plasma actuator on the flow control around a NACA0015 airfoil

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Abstract

This paper reports on the effects of a series of fluid-dynamic dielectric barrier discharge plasma actuators on a NACA0015 airfoil at high angle of attack. A set of jet actuators able to produce plasma jets with different directions (vectoring effect) and operated at different on/off duty cycle frequencies are used. The experiments are performed in a wind tunnel facility. The vectorized jet and the transient of the flow induced by unsteady duty cycle operation of each actuator are examined and the effectiveness of the actuator to recover stall condition in the range of Reynolds numbers between 1.0 × 105 and 5.0 × 105 (based on airfoil chord), is investigated. The actuator placed on the leading edge of the airfoil presents the most effective stall recovery. No significant effects can be observed for different orientations of the jet. An increase of the stall recovery is detected when the actuator is operated in unsteady operation mode. Moreover, the frequency of the on/off duty cycle that maximizes the stall recovery is found to be a function of the free stream velocity. This frequency seems to scale with the boundary layer thickness at the position of the actuator. A lift coefficient increase at low free stream velocities appears to linearly depend on the supply voltage.

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Authors and Affiliations

  1. Department of Electrical, Electronic and Information Engineering, University of Bologna, Viale Risorgimento 2, Bologna, Italy

    Carlo A. Borghi, Andrea Cristofolini, Gabriele Neretti & Paolo Seri

  2. Department of Industrial Engineering, University of Bologna, Via Fontanelle 40, Forlì, Italy

    Alessandro Rossetti & Alessandro Talamelli

Authors
  1. Carlo A. Borghi
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  2. Andrea Cristofolini
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  3. Gabriele Neretti
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  4. Paolo Seri
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  5. Alessandro Rossetti
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  6. Alessandro Talamelli
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Correspondence to Alessandro Talamelli.

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Borghi, C.A., Cristofolini, A., Neretti, G. et al. Duty cycle and directional jet effects of a plasma actuator on the flow control around a NACA0015 airfoil. Meccanica 52, 3661–3674 (2017). https://doi.org/10.1007/s11012-017-0692-3

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  • DOI: https://doi.org/10.1007/s11012-017-0692-3

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