Darrieus turbine has attractive characteristics such as the ability to accept wind from random direction and easy installation and maintenance. However, its aerodynamic performance is very complicated and challenged. Darrieus turbine is one of the vertical axis wind turbines which is very promising type of wind turbines at remote and domestic locations that have low and weak wind potential and speed. But from the quantitatively comparison with horizontal axis wind turbines, this type of turbines has a weak performance. So, this paper introduces a numerical analysis of three-bladed Darrieus vertical axis wind turbine performance using 25 different sectional profile airfoils from different families. This investigation is to optimize and maximize torque output coefficient and output power coefficient. Aerodynamic simulations were used depending on finite volume analysis using computational fluid dynamic (CFD) methodology. These CFD simulations used the unsteady (transient) Reynolds-Averaged-Navier-Stokes (URANS) calculations to solve and analysis the flow field around the turbine. Quantitative and qualitative validation is presented in this work, it is found that an acceptable agreement between the current CFD calculations and the published experimental work in the calculations of the power output coefficient. The results presented that the best configuration is LS (1)-0413 airfoil. The power coefficient of the turbine consists of LS (1)-0413 airfoil has been increased by 16% compared to NACA 0021 performance

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