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By Della Ratta Rinaldi, Roberto; Arina, Renzo; Iob, Andrea

ISBN-10: 9533074736

ISBN-13: 9789533074733

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Therefore stability extension effect is much better. The changes of Ψmax and Φns are summarized in table 2. Ψmax decreases at every case when plasma actuation is on. The Ψmax decrease is least when the Φns decrease is most. So there is no contradiction between stability range extension and pressure rise coefficient improvement. When the ability for plasma actuation to control the blade tip end wall region flow becomes stronger, the stability extension effect is better and the pressure rise ability almost remains same.

The control effects influenced by various actuation parameters were investigated. 30 Aeronautics and Astronautics The airfoil used was a NACA 0015. This shape was chosen because it exhibits well-known and documented steady characteristics as well as leading-edge separation at large angles of attack. The airfoil had a 12 cm chord and a 20 cm span. The airfoil was made of Plexiglas. Twelve pressure ports were used to obtain the pressure distribution along the model surface. Fig. 11 shows location of the pressure ports on the model's surface.

5 W when the applied peak to peak voltage increases from 8 kV to 12 kV. When the applied voltage is less than 9 kV, the control effect is very tiny. When the applied voltage is higher than 10 kV, the control effect saturates and further increases in the voltage amplitude shows no evident benefit. Furthermore, higher voltage may lead to earlier destruction of the dielectric material, which is not desirable in the experiments. Fig. 24. 2 Unsteady plasma flow control experiment results Optimization of the excitation mode based on coupling between the plasma aerodynamic actuation and the separated flow is one of the important ways of improving plasma flow control effect.

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