TY - JFULL AU - Marco Raciti Castelli and Giulia Simioni and Ernesto Benini PY - 2012/2/ TI - Numerical Analysis of the Influence of Airfoil Asymmetry on VAWT Performance T2 - International Journal of Aerospace and Mechanical Engineering SP - 74 EP - 84 VL - 6 SN - 1307-6892 UR - https://publications.waset.org/pdf/6882 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 61, 2012 N2 - This paper presents a model for the evaluation of energy performance and aerodynamic forces acting on a three-bladed small vertical axis Darrieus wind turbine depending on blade chord curvature with respect to rotor axis. The adopted survey methodology is based on an analytical code coupled to a solid modeling software, capable of generating the desired blade geometry depending on the blade design geometric parameters, which is linked to a finite volume CFD code for the calculation of rotor performance. After describing and validating the model with experimental data, the results of numerical simulations are proposed on the bases of two different blade profile architectures, which are respectively characterized by a straight chord and by a curved one, having a chord radius equal to rotor external circumference. A CFD campaign of analysis is completed for three blade-candidate airfoil sections, that is the recently-developed DU 06-W-200 cambered blade profile, a classical symmetrical NACA 0021 and its derived cambered airfoil, characterized by a curved chord, having a chord radius equal to rotor external circumference. The effects of blade chord curvature on angle of attack, blade tangential and normal forces are first investigated and then the overall rotor torque and power are analyzed as a function of blade azimuthal position, achieving a numerical quantification of the influence of blade camber on overall rotor performance. ER -