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    Öğe
    Aerodynamic performance changes of an airfoil modified with biomimetic spiky-vortex generators
    (AIP Publishing, 2025) Kaya, Fatih; Akbiyik, Hurrem
    An experimental study was conducted to investigate the aerodynamic characteristics and surface flow topologies of spiky-vortex generators (Spiky-VGs) placed on the National Advisory Committee for Aeronautics (NACA0012) airfoil. Within the scope of this study, aerodynamic force measurement and titanium-dioxide (TiO2) surface oil experiments were performed at a Reynolds number (Re) of 1.5 x 10(5). Moreover, TiO2 surface oil and three-dimensional (3D) smoke-wire flow visualization techniques were applied to Spiky-VG having a certain scale. According to the aerodynamic force measurement results, it was observed that model 1 (M1) Spiky-VGs increase the maximum lift coefficient (C-Lmax) by 7.6% compared to the base NACA 0012 airfoil. It was observed that model 2 (M2) increased the lift coefficient (C-L) by 9.9% at an angle of attack slightly above the stall angle of the baseline airfoil (alpha = 11 degrees) and delayed the onset of stall by approximately 1 degrees. Furthermore, the drag coefficient (C-D) of model 2 (M2) is lower than that of the base wing model and is about 14.5%, indicating improved aerodynamic performance. It was observed that the presence of Spiky-VGs leads to significant alterations in surface flow topology over the wing model, primarily owing to their geometric configuration. The findings demonstrate that Spiky-VGs, functioning as vortex generators, contribute to enhanced aerodynamic performance by modifying surface flow topology and improving flow characteristics. Hence, they can be considered as effective passive flow control devices for airfoil applications.
  • [ X ]
    Öğe
    Investigation of the effects of bioinspired vortex generators on aerodynamic performance of a NACA0015 airfoil
    (IOP Publishing Ltd, 2025) Kaya, Fatih; Akbiyik, Hurrem
    An experimental study was carried out to investigate the effects of biomimetic vortex generators (biomimetic-VGs) on the aerodynamic performance of the NACA0015 airfoil. Aerodynamic force measurements and titanium dioxide (TiO2) based flow visualization technique experiments were performed for test models at Re = 1.2 x 105. Aerodynamic force measurement experiments were carried out in the wind tunnel at angles of attack of 0 degrees-18 degrees with an increment of 1 degrees. As a result of the experiments, it was revealed that the lift coefficient (CL) increased and the drag coefficient (CD) decreased by using the seaconchshell structure as a VG for the wing model. In addition, it has been observed that biomimetic models (BMs) shifted the stall angle of the airfoil by 1 degrees. In the surface oil flow visualization experiment results, the flow structure around the NACA0015 airfoil of BMs was revealed and interpreted. Moreover, it has been revealed that the aerodynamic performance of the airfoil increases as a result of the use of BMs. It is also revealed that the seaconchshell structure, which has not been studied before in the literature and which is the subject of this study, can be used as an effective flow control device.