Numerical Simulation on Aerodynamic Performance of a Three-Bladed Darrieus –H Wind Turbine
The purpose of this research work is to investigate computationally the improvement of the performance of the vertical-axis Darrieus-H wind turbine.The simulations of the aerodynamic field around a four-bladed straight –axis wind turbine (VAWT) are presented for different values of the Tip Speed Ratio λ (TSR), λ = 1.5 to λ = 3. Six different pitch angles are considered with symmetrical airfoil NACA0015. The Reynolds-Averaged Navier–Stokes equations are completed by the K- ώ SST turbulence model. Multiple Reference Frames (MRF) model capability of a computational fluid dynamics (CFD) solver is used to express the dimensionless form of power output of the wind turbine as a function of the wind freestream velocity and the rotor’s rotational speed. The results show that the optimized turbine experienced maximum power coefficient of 0.41 in tip speed ratio of 2.5 and in pitch angle 6° for CFD simulations. The experimental data from the literature and computational results were then compared for verification.
Keywords— Wind Energy, Vertical Axis Wind Turbine, Computational Fluid Dynamics, Power Coefficient.