IJET Vol. 4, Issue 4, December 2018
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Öğe Low Speed Numerical Aerodynamic Analysis of New Designed 3D Transport Aircraft(Istanbul Gelişim University Press, 2019-02-19) Soğukpınar, HacıIn this study a new airfoil is designed by using aerodynamic features of the NACA 0012 airfoil and numerical calculation is conducted by using Spalart–Allmaras Turbulence Model and calculated lift and drag coefficients are compare with experimental result to correlate numerical calculation accuracy of CDF model. Then, according to the new airfoil data, a three dimensional aircraft fuselage, and its wings are designed and, tail section is designed by using NACA 0012 airfoil. Finally, 3D model aircraft are simulated for cruise flight, climb and descent at the angle of attack +10 and -10 degrees respectively. The simulation results are interpreted in terms of fluid dynamics. It is observed that during the ascension and descent of the aircraft, very large vortices are formed by the low pressure effect occurring at the rear upper or lower part of the fuselage. Vortexes originating from the rear body are given with the wing tip vortexes in the same figures but the vortex due to the back of the fuselage is found to be very large compared to the wingtip. Furthermore, for each simulation, the formation of the wingtip vortexes are investigated and presented. It is observed that during ascending the vortex formation is formed in roll up and roll down in the phase of descending.Öğe Effects of Cell and Module Configuration on Battery System in Electric Vehicles(Istanbul Gelişim University Press, 2019-02-19) Eren, Mahmut Kerem; İpek, Eymen; Aras, Kadir; Gücükoğlu, Turgay; Erhan, KorayBattery pack is one of the most important powertrain components in Electric Vehicles (EV). The performance of battery pack directly affects vehicle’s range and performance. Configuration of cells and modules inside battery pack also plays an important role on battery performance and safety. In this study, the work deals with an electric vehicle that has 400 V DC bus voltage and 78 kWh total energy content. When the vehicle’s battery is designed, the criteria to be focused on are evaluated for three different configurations of given cell quantity. Thus, optimum design solution can be achieved. According to calculations, cost analysis, total electrical power loss and most efficient solution scenarios (alternatives) are determined for these three different configurations afterwards system complexity is optimized. In the first configuration, 8 series modules are selected which have 12s6p cell configuration. In the second configuration, there are 16 modules with 8s2p module combination. Each module is equipped with 12s3p cell configuration. Last configuration has 16 modules in series where each module has 6s6p cell configuration. Advantages and disadvantages of the systems are revealed as a result of the calculations made for each configuration.
