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Browsing by Issue Date, starting with "2023-06-08"

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  • Optimal Operation of the NACA0012-IK30 Airfoil
    Publication . Camacho, Emanuel A. R.; Silva, A. R. R.; Marques, Flávio D.
    The kinematics of oscillating airfoils are crucial to understanding subjects such as rotor dynamics and bio-inspired flows. Unsteady airfoils have been studied extensively, but there is an overall lack of knowledge regarding newer and more complex kinematics. The present paper builds upon previous studies of the NACA0012-IK30 airfoil by implementing a gradient-based method that searches for a leading-edge pitching amplitude that maximizes propulsive power. All of this is done numerically by solving the Reynolds-Averaged Navier-Stokes equations coupled with the Intermittency Transition model. Results indicate that for higher reduced frequencies, higher leading-edge pitching amplitudes are required to maximize the mean propulsive power. Additionally, propulsive power is achieved with near-optimal propulsive efficiency, which is a common limitation of traditional flapping airfoils.
    2023-06-08Conference object Embargoed access Show more
  • Design and Testing of a Wing with a Morphing Trailing Edge
    Publication . Pinho, João; Camacho, Emanuel A. R.; Silva, A. R. R.
    In recent years, the interest in morphing technologies has been continuously growing. Many designs have been developed, but some are very complex to manufacture. The main goal of this paper is to present a wing design with a morphing trailing edge that is easy to manufacture and control while allowing the execution of appropriate aerodynamic studies in wind tunnel. Using computer-aided design and 3D printing, a wing that is easily controlled with easy-to-use hardware is developed, manufactured, and studied using flow visualization and force acquisition. Flow visualization showed that the presence of curvature delays stall occurrence when compared to the symmetrical configuration, where flow separation starts right at the leading edge. This is validated by force measurements where curvature plays an important role regarding lift enhancement. This design will allow for a wider range of studies, including unsteady conditions, which can offer insights concerning aerodynamic surfaces design.
    2023-06-08Conference object Embargoed access Show more