Browsing by Author "Gunel, Onur"

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CFD vs. XFOIL of Airfoil Analysis at Low Reynolds Numbers
(2016) Gunel, Onur; Koc, Emre; Yavuz, Tahir
For Blade Element Momentum (BEM) theory, the airfoil data needs to be as accurate as possible. Nowadays, Computational Fluid Dynamics (CFD) is used for optimization and design of turbine application. Lift coefficient, drag coefficient and lift coefficient over drag coefficient are significant parameters for turbine application. Selecting a suitable computational tool is crucial for design of the turbine. Panel method and an integral boundary layer formulation are combined in the MOIL code for the analysis of potential flow around the airfoils. In this study, XFOIL code and Transition SST k-omega model were used to predict the aerodynamic performance at low Reynolds numbers (Re = 3x10<^>5, 4x10<^>5, 5x10<^>5). The results were compared and CFD results and XFOIL, code result are compatible with each other until stall angle. Also XFOIL, and CFD results were shown a good coherence with literature.
Comparison of Qblade and CFD Results for Small-Scaled Horizontal Axis Wind Turbine Analysis
(2016) Koc, Emre; Gunel, Onur; Yavuz, Tahir
The software QBlade under General Public License is used for analysis and design of wind turbines. QBlade uses the Blade Element Momentum (BEM) method for the simulation of wind turbines and it is integrated with the XFOIL airfoil design and analysis. It is possible to predict wind turbine performance with it. Nowadays, Computational Fluid Dynamics (CFD) is used for optimization and design of turbine application. In this study, Horizontal wind turbine with a rotor diameter of 2 in, was designed and objected to performance analysis by QBlade and Ansys-Fluent. The graphic of the power coefficient vs. tip speed ratio (TSR) was obtained for each result. When the results are compared, the good agreement has been seen.