In this work is presented the experimental study of the effects in the fluid-dynamic field around a wing with a simple flap when a propeller in pusher configuration is powered. The aim of this study is analyze the characteristics of the air flow over the system and determine the aerodynamic effects, such oscillations, of the flap command. Different tests were carried out in a wind tunnel taking account the possible different positions of the propeller relative to the flap, different deflections angles of the flap, and multiple rpm of the pusher. For the analysis of the flow over the flap, it was equipped with multiple taps to acquire the pressure on the upper and lower surface. Integral time scales over the upper surface, frequency analysis and hinge moment were calculated to understand the phenomena involved. Important differences were found in the regions of the flap inside the radius of the propeller, but not in the other stations. The time scales outside the radius of the propeller are affected due to the propeller but not in a linear response with respect the rpm of the motor. Also, in the internal region, with respect the radius, of the flap the time scales are mainly uniform, changed strongly due to the presence of the propeller. The hinge moments are raised due to the propeller influence, as was expected and also bigger oscillation of the hinge moment were found for the different tests. The bigger oscillations, with respect to the mean value are founded at the lesser deflection angles; these are explained with the interaction of the flap captive vortex formed and the propeller influence, which minimize the propeller effect.
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