Control of a turbulent flow separated at mid-chord along an airfoil with DBD plasma actuators |
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Institution: | 1. University of Salento, Department of Engineering for Innovation, Via per Monteroni, 73100 Lecce, Italy;2. Universidad Politecnica de Cartagena, Dep. Ingenieria Termica y de Fluidos, c/Dr. Fleming s/n, 30202 Cartagena, Murcia, Spain;1. Université de Poitiers, Institut PPRIME, ISAE-ENSMA, CNRS UPR 3346, Futuroscope, France;2. Université de La Réunion, LE2P, Saint Denis, France |
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Abstract: | The goal of the present experimental study is to investigate the ability of surface DBD plasma actuators to delay flow separation along the suction side of a NACA0015 airfoil. Three single surface DBD actuators that can operate separately are mounted on the suction side of the profile, at 18%, 27% and 37% of the chord length. The boundary layer is transitioned by a tripper to be sure that the flow control is not due to the laminar-to-turbulent transition. The angle of attack is equal to 11.5° and the free-stream velocity to U0 = 40 m/s, resulting in a chord-based Reynolds number of Rec = 1.33 × 106. The flow is studied with a high-resolution PIV system. In such conditions, the baseline flow separation occurs at 50% of chord. Then, the different single DBD have been switched on separately, in order to investigate the actuator location effect. One highlights that the DBD located at xc/c = 18% is more effective than the two others ones, with a separation delay up to 64% of chord. When the three DBDs operate simultaneously, the separation point moves progressively toward the trailing edge when the high voltage is increased, up to 76% of chord at 20 kV. Finally, the effect of the actuation frequency on the control authority has been investigated, by varying the value of the operating frequency and by burst-modulation. For frequencies equal to 50 Hz and 500 Hz (reduced frequency F+ = 0.31 and 3.1), the separation has been delayed at 76 and 80% of chord, respectively. |
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Keywords: | Surface DBD Plasma actuator Electrohydrodynamics Ionic wind Flow control Airfoil |
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