Abstract
We quantitatively evaluate the airfoil performance using numerical analysis on the flow around the airfoil to improve the startup characteristics and the maximum output of straight wing vertical axis wind turbines. To do this We need a numerical method that can accurately evaluate the performance of airfoil. In this study, using a single airfoil of NACA0018, We compared analyzed results and experimental results on the phenomenon that detachment arises prominently at near the stall angle. Therefore we used three turbulence models LES, DES-SA and DES-SST in our analysis. As a result, over the stall angle (α=14°), Cl and Cd did not match the experimental value. But we figured out that the DES-SST model decreased Cl and was able to analyze the stall phenomenon.
