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Energies 2020, 13, 1374 3 of 20 rib and shaft are made of nylon to improve the insulation because the high voltage cable is clamped on them during the tests. On the opposite side, the components are made of aluminium alloy to improve the pitching constraint. The whole airfoil + shafts assembly is shown in Figure 1. 2.2. Wind Tunnel and PIV Setup Aluminium shaft and rib PMMA insert Ureol body Figure 1. NACA0015 assembly. The PIV measurements were performed in the “Sergio De Ponte“ wind tunnel, a closed circuit facility with a 1.5 × 1 × 3 m test section. The nominal power is 100 kW, allowing airspeeds up to 55 m/s in the test section, which is optimized for aeronautical purposes, with a turbulence level lower than 0.3% and streamlines with angular variations lower than 0.1◦. The model and the instrumentation have been assembled on a test rig derived from a previous experiment designed to bear high aerodynamic loads [27]. In order to evaluate the complete flow field over the suction side of the airfoil, it was necessary to install two PIV cameras, each one with a 2 Mpx CCD sensor, rigidly constrained to the support structure. They were fitted with two different lenses, a 50 mm one on the fore camera in order to obtain an higher definition on the leading edge (DBD region) and a 24-mm lens on the aft camera to have a wider flow field on the mid-rear section of the airfoil. The laser system originates impulses of 200 mJ with 532 nm wavelength and was synchronized with the cameras. Wind seeding was obtained by dispersing Di-Ethyl-Hexyl-Sebacate (DEHS) droplets. The complete setup is sketched in Figure 2, and a sample of the fields covered by the two cameras is shown in Figure 3. Nylon rib Nylon shaftPDF Image | Stall Control by Plasma Actuators: Characterization along the Airfoil Span
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