Maneuvering Aspects and 3D Effects of Active Airfoil Flow Control |
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Authors: | Itay Timor Eli Ben-Hamou Yair Guy Avi Seifert |
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Institution: | (1) Department of Fluid Mechanics and Heat Transfer, School of Mechanical Engineering, Faculty of Engineering, Tel-Aviv University, Ramat-Aviv, 69778, Israel;(2) RAFAEL, Haifa, Israel |
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Abstract: | An active flow control experiment was conducted on a cropped NACA 0018 airfoil to study 3D effects and maneuverability aspects
made possible by a segmented actuation system installed in the airfoil. The 14 piezo-fluidic actuators were installed at the
corner of the cropped region, inclined at 30° to the local surface, facing downstream. Operating all actuators at unison significantly
increased lift and generated a pitch-down moment. Operating all actuators at the same magnitude but varying the phase along
the span generated larger lift-increment, with respect to the uniform phase excitation. Significant rolling moment can be
generated when only half-span of the wing is actuated. The latter effect, as indicated by the 3D pressure distribution, persists
to the leading edge even though the excitation was introduced close to the trailing edge. When a pair, out of the possible
fourteen actuators is not operating, very little of the control authority is lost. This is an important finding when issues like fault tolerance and robustness
of fluidic-piezo actuators are considered. |
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Keywords: | Flow control Guidance Airfoil Mild manuvering |
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