Numerical Simulation On The External Flow Field Of An Airfoil For Wind Turbine Blade

Wind energy is the most representational energy in clean reproducible energy, it has important signification of the environment protection and ecosystems balance, it can reduce the depend on the conventional source of energy and improve the energy structure , it is important to our country for realizing sustainable development.The keystone of the development makes use of the wind machine is to convert the wind energy into the electric power and the blade of wind turbine is also the important part. This paper is study the methods for calculate the aerodynamic performance for the blade of wind turbine. The first using computation Fluent Dynamics software—FLUENT for figuring out the aerodynamic performance of airfoil, and bring out the methods for designing the Blades.The study on the numerical simulations to obtain the aerodynamic performance of airfoil is in order for designing blade. There are various methods for designing the blade and this paper study several for instant simple windmill theory, Glauert vortex theory, Schmitz theory and momentum-element theory. Considering of the last theory is the most popular methods forresearchers to use designing the blade because this method is very convenient for carry out the result if the calculations are very complex. It can decomposed complicated equation into several simple equation. This paper is focus on the interference factor of the equation take from momentum-element theory and the general methods for calculation and designing of vane are given in this paper and you can design a blade steps by steps.Numerical simulations of flow around tradition airfoil NACA2412 with large range attack angles are made. Finite volume method, SIMPLE method and standard k ?εdouble equations based on turbulence model. Through comparing the resistance force and maximum lift-to-drag ratio knowable triangle airfoil resistance is larger. After the improvement NACA2412 airfoil resistance is relatively small, lift-to-drag ratio than prior to the improvement of airfoils, wind energy utilization rate is higher. And when the Angle of attack is lesser, present smaller separation vortex flow; When the Angle of attack continue to rise, the tail vortex further expand, show strong separation flow characteristics. The improved NACA2412 airfoil air dynamic characteristics is superior to the original airfoils, more suitable for wind machine working environment, can improve the performance of wind turbines.