Stall Control by Plasma Actuators: Characterization along the Airfoil Span

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Stall Control by Plasma Actuators: Characterization along the Airfoil Span ( stall-control-by-plasma-actuators-characterization-along-air )

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Energies 2020, 13, 1374 14 of 20 show some slight changes in the actuated velocity profiles, mainly related to a wake reduction effect. The actuator-flow interaction, then, seems to be beneficial on all the tested planes. 􏲓􏲙 O􏲚? 􏲓 􏲘􏲓􏲙 􏲓􏲙 O􏲚? 􏲓 􏲘􏲓􏲙 􏲓􏲙 􏲓 􏲖=􏲗 􏲖>􏲗 􏲘􏲒􏲓 􏲓 􏲒􏲓 􏲓 !􏲓 "􏲓 􏲘􏲒􏲓 􏲓 􏲒􏲓 􏲓 !􏲓 "􏲓 7􏲖􏲎􏲚I􏲗 􏲖?􏲗 7􏲖􏲎􏲚I􏲗 􏲖@􏲗 􏲘􏲓􏲙 􏲓􏲙 􏲘􏲓􏲙 􏲓 􏲘􏲒􏲓 􏲓 􏲒􏲓 􏲓 !􏲓 "􏲓 􏲘􏲒􏲓 􏲓 􏲒􏲓 􏲓 !􏲓 "􏲓 7􏲖􏲎􏲚I􏲗 7􏲖􏲎􏲚I􏲗 Figure 20. Cross-wake velocity profiles at (a) TA, (b) TB, (c) TC, and (d) TE for α = 14.5◦ and U∞ = 30 m/s. With the same procedure described in Section 3.1, the off–on variations in the CP curves were evaluated for different spanwise sections. These data are reported in Figure 21 for the planes TA , TB , TC , confirming that the main region of influence lies in the central zone of the model. In particular, the plasma effect leads to a significant increase of the CP peak value in the central section TA, where it grows about 30%; then, the off–on difference is progressively reduced moving toward the lateral planes. However, the chordwise extension of the region influenced by the actuator increases on the lateral planes, so that it is reasonable to expect a contribution on the total lift from all the studied sections.

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