The Aerodynamics Calculation In The Rotor Of A Large-Power Horizontal-Axis High Speed Wind Machine

With the development of society, energy demand is ever-increasing. At the same time, we are also facing to the problem of protection from environment pollution. At present, adopting horizontal-axis wind machine to generate electricity is the main form of use of wind energy to deal with above problem. The rotor of wind machines is its key assembly, and its aerodynamic calculation is the investigation basis of wind machine. Seeking approachs to improving aerodynamic characteristics of wind machine rotor is the primary aim of developing large-scale electricity generation with wind equipment. Thus, the theory and means of aerodynamic calculation of wind turbine is one of main problems in wind machine investigation.After briefly analyzing the wind power exploitation, especially the aerodynamic investigation of wind machine, at home and abroad several wind machine aerodynamic design theories in common use are introduced in detail and compared to each other. Meanwhile, the up-to-date evolvement of aerodynamic investigation of wind turbine rotor is summed up, including the research of aerodynamics characteristic of special aerofoils for wind machine, the oscillatory spray improves the performance of wind machine aerofoils and increase local roughness of surface of the aerofoils to improve their lift, providing reference to further investigation of wind machine."Design wind speed" is an important parameter in aerodynamic calculation of wind machines. According to wind speed distribution function, the wind power produced by the which passes through wind the rotor on swept area is analysed and calculated. The calculation results confirms that the wind speed at the rotor center can be taken as the design wind speed, and the aerodynamic design of the rotor will be fairly reasonable without consideration of the form influence of wind shear section.Finally, commercial softwares of computational fluid dynamics commonly used for wind machine investigation are explained in detail. According to the actual development condition of wind machine, the geometry of flow region is reasonably modeled, numerical simulation is conducted with software FLUENT. Then the simulation result is analysed and vortex system in the rotor is obtained. It is verified by the numerical result that CFD can offer useful help for aerodynamic investigation of wind machine. With the development of computer technology and further improvement of turbulence modeling, CFD will certainlybecome the development tendency of aerodynamic calculation of wind machine.