Fenômeno de wing rock em placas ortotrópicas

Abstract

The wing rock phenomenon is characterized by an undesirable rotational oscillation in aircrafts, mainly in roll axis, which occurs at relatively low flight speeds and high angle of attack. Flight instabilities caused by rotational oscillations of the wing rock phenomenon can affect aircraft performance and flight control. In the present work, the wing rock phenomenon is studied in rectangular orthotropic plates of composite materials with several elongations. The experiments were performed in a wind tunnel with a wind speed of 6 m/s. Composite material plates were produced with unidirectional fibers and were positioned with the fibers oriented at 0° or 90° with respect to the air flow direction. The parameters studied were Strouhal number, variation of the rolling angle, plate deformation and the influence of the fiber orientation on the wing rock phenomenon. The results obtained with composite material plates were compared with results obtained in aluminum plates with the same elongation. It was observed for the composite plates with fibers oriented at 90° of the flow direction, with aspect ratio of 3.25, a reduction in vibrations induced by vortices as the angle of attack increases, as compared to aluminum plates.