Large Wind Turbine Blade Design And CFD Analysis

Because of the harsh environmental requirements of energy, wind power industry by the close attention of all countries, wind power technology has made tremendous development, the stand-alone wind turbine capacity has been increased. At present, the mainstream of the wind power are from the past 100 kilowatts to the development of megawatt-scale level. With the power increase of the wind turbine, the traditional aerodynamic design priority to the design method, can not fully meet this high-power wind turbine design on the structural stability requirements. In order to overcome the shortcomings of traditional design methods, the paper proposed a new design concept, that is to conduct a preliminary design of the structure, followed by aerodynamic design.When the preliminary design of the structure, in order to obtain aerodynamics, will use some empirical formula leaves the preliminary estimate of the forces, and to use these results to design leaves the spar cap, determine the cross-section's thickness and width of the spar cap, on the basis of this Leaves are cross-section of the inner ring airfoil the greatest thickness. In order to ensure that the roots of connections to meet the design requirements, the paper used metal flange connection, leaves and roots between the flange adhesive, and wheel flange between a bolt connection.Blunt trailing edge airfoil that can greatly improve the aerodynamic and structural performance of the large-scale wind turbine blades inner ring. By using the existing wind turbine airfoil for improved design be blunt trailing edge airfoil, and then use CFD methods and computational fluid dynamics software FLUENT to simulate aerodynamic performance of the blunt trailing edge airfoil, according to CFD results to discuss the mechanism to improved aerodynamic performanceof the blunt trailing edge airfoil ;at the same time study the effect to reduce the resistance when installation of splitter plate in the blunt trailing edge airfoil.At the conclusion of the text leaves the preliminary design of the structure, leaves in the aerodynamic design, expansion of the use of Glauert vortex methods, will improve blunt trailing edge airfoil applied to the leaves of the inner ring and design the level of 1.5 MW propeller shaft change Moment horizontal axis wind turbine blades. Finally FLUENT software applications for the new wind turbine design for the aerodynamic performance prediction, and the same type of commercial wind turbine compared to inspect and test the new design of the wind turbine is to meet design requirements.