The Small Wind Turbine Design And Numerical Simulation Of Aerodynamic Performance For Rotor

In this article, the research work on 10KW small fixed pitch wind turbine and using the CFD software Fluent to investigate the aerodynamic performance of special airfoils and wind rotor in numerical method. These studies mainly consist of the following aspects:Different turbulence models such as S-A,RNGκ-εandκ-ωSST were used to simulate airfoil S827,S832, and the computational results were compared with the experimental data, the predictability of different turbulence models to the aerodynamic performance were investigated, so as to make sure the certain turbulence models which is suitable for the flow problems in this paper.In this article, numerical simulation is used to analyse the aerodynamic properties of five wind turbine airfoils between the two series of NACA and NREL. The results show that:For the S series airfoil, when the airfoil curvature is similar, with the increase of the thickness airfoil, corresponding to the same angle of attack of the airfoil lift coefficient has increased, at the same time, the pressure drag on the airfoil also increased following, makes the airfoil lift-drag ratio decreased. However, when compared with the thin airfoil, the thicker airfoil has the wider range of best lift-drag ratio. Within the appropriate angle of attack, increase the airfoil curvature, can increasing the airfoil lift coefficient and lift-drag ratio, make the airfoil has a wide range of high lift-drag ratio. But beyond a certain angle of attack range, the larger airfoil curvature is prone to occur flow separation. NREL wind turbine airfoil can better meet the requirements of the aerodynamic performance than the traditional airfoils, and the airfoil has a high energy conversion efficiency.Based on the Wilson method, a 10KW small fixed pitch wind turbine was designed, considering various factors such as the tip losses,root of blade losses,axial and circumferential factors on the optimization of aerodynamic performance for the blade. Based on Pro/E 3D modeling software to realize the three-dimensional models of wind turbine rotor, constructed the three-dimensional solid model of the Wind Turbine Blades and rotor, thus enhanced the efficiency and precision of the design and modeling of wind wheel.Finally, the Fluent software was used for numerical simulation for wind turbine at rated wind speed and fifteen other speeds to calculate the wind turbine power and efficiency under different speeds. Approved the validity and reliability to the optimal design method and numerical simulation; analysed the pressure and velocity distribution of wind wheel blade at rated operating conditions, and discussed the three-dimensional rotational effect on the flow characteristics.