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AYDIN, NESLİHAN

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AYDIN

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NESLİHAN

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    Publication
    An experimental study of the aerodynamic performance of a maple wing model at low reynolds numbers
    (Elsevier, 2023-04-17) Aydın, Neslihan; Çalışkan, Mehmet Erman; Sabırlı, Muhammed U.; Karagöz, İrfan; AYDIN, NESLİHAN; ÇALIŞKAN, MEHMET; Sabırlı, Muhammed U.; KARAGÖZ, İRFAN; Mühendislik Fakültesi; Makine Mühendisliği; 0000-0002-6123-9627; 0000-0002-7442-2746; 0000-0003-3650-0886; AAB-9388-2020; AAB-9496-2022; DUS-9551-2022; ISD-7974-2023
    Maple seeds are widely known for their autorotation and may achieve remarkably long-distance flights owing to their unique wing morphology. These features suggest the adaptability of the blades to wind turbines and air vehicles. However, the effects of these morphological features on aerodynamic force generation are still poorly understood. An enlarged replica of a sample 3D maple wing was produced using additive manufacturing. Direct force experiments were conducted in a low-speed wind tunnel using a two-component force balance to obtain the lift and drag coefficients of the model wing. The polar curves of the wing were obtained for three different Re numbers by repeating the experiments over a wide angle of attack range of-50 to 50 degrees. The best aerodynamic performance is obtained at 18 degrees and-12 degrees attack angles for positive and negative angles, respectively, regardless of the Re number. This preliminary study shows that maple seed can be mimicked in the design of propellers and wind-turbine blades.
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    Numerical investigation of heat and flow characteristics in a laminar flow past two tandem cylinders
    (Vinca Inst Nuclear Sci, 2021-01-01) Aydın, Neslihan; Özalp, Alper; Karagöz, İrfan; AYDIN, NESLİHAN; ÖZALP, ABDURRAHMAN ALPER; KARAGÖZ, İRFAN; 0000-0002-7442-2746; AAB-9388-2020; AAB-9496-2022
    Heat and flow characteristics were investigated numerically for a laminar stream past two tandem circular cylinders placed in a channel. The blockage ratios (beta = D/H) were chosen to be 0.6, 0.7, and 0.8, respectively, and the gap between the cylinders was varied proportionally to the cylinder diameter as g = 0.2D, 0.7D, 1.5D, and 4D at a low Reynolds number (Re = 40). The effects of the blockage ratio, as well as the gap between two cylinders on heat and flow features were examined in detail. Shear stresses, dimensionless static pressure, heat transfer coefficient, and separation points from the cylinders were determined from the velocity and temperature fields in the flow domain. The results showed that the separation angle decreases with both the blockage ratio and the gap size on the downstream cylinder, whereas heat transfer increases with both the blockage ratio and the gap size on the upstream cylinder.