Research On The Aerodynamic And Elastic Problem Of Blade Of The Wind Turbine

With the development of society and the progress of science and technology, the mankind faces the serious exhausted challenge with the problem of being deficient of resource and environmental pollution day by day. At this moment wind energy is remarked as a sort of new energy that is large in reserves, wide in distribution, the cheapest, the most clean and the most valuable to exploit. So it has received the extensive attention from all walks of life, the research to the wind turbine intensifies gradually too. In our country, the efficiency of the use of the wind turbine is comparably subjacent. So in order to handle it well we must accelerate the research of them.Blade, the force on which is the most complicate and the design on which is the most awkward, is an important component of the wind turbine. As the elasticity, the blade will be accompanied with deformation and vibration because of aerodynamic function in operating. The structure is under aerodynamic force, mass force and elastic force, the amplitude of which is increasing on and on. Such unstable vibration, will cause very great stress of moving in the structure, influence the normal running of the wind turbine, will even cause the serious consequence that the part and complete machine are damaged. Then, the research of the aerodynamic and elastic character of the wind turbine, become the important problem, which is relation to the safety and reliability of the wind turbine, and also become the focus in development of the wind turbine.This text proceed with the theory of the vibration, utilize typical elastic hinge law analyze structure dynamics characteristic when the blade is quivered to instability, and then use relevant knowledge of blade vibration to simplify the model and the aerodynamic force of the vibration. Through the simplification, we can get the equation of the blade, which is dispersed to its instability. Then VISUAL BASIC procedure is utilized to work out thecharacteristic value of vibration and the vibration frequency. At last comparing the result which is calculated by the above-mentioned theory formulae with the result which is calculated by internationally agreed procedure ANSYS to verify the accuracy of the formula of reduction. Through the reduction of the formula, three degrees of freedoms are turned into two degrees of freedoms, so the workload is simplified in the process of the designing. Meanwhile, through analyzing the equation we can find some elements that affect the vibration frequency of the blade then get the corresponding curve.