Optimization And Design Of Aerodynamic Shape For Wind Turbine Blade

The blade is one of the highest technical content and the most important parts for wind turbine. The aerodynamic shape decides the wind turbine efficiency directly. So it is the key point for the wind turbine to design blade with better aerodynamic shape.This thesis is divided into five parts.The first chapter gives a brief introduction for development situation of wind energy and research purpose & contents of this subject.The second chapter mainly explains the aerodynamic design theory of the wind turbine.In order to improve aerodynamic efficiency of a 20KW wind turbine blade, available from NREL's design, in the third chapter it is analyzed and re-designed and its optimal pitch angle and rotor speed can be also obtained by the PROPID program.In the fourth chapter based on BEM theory and technical standard, the aerodynamic shape concept design of 1500KW blade is done and aerodynamic performance is evaluated through the GH BLADED software. According to the characteristics of the canulate blade, conventional fiber laminas structure is not suitable and need to be re-designed to meet the new type blade structure characteristics. Sectional characteristic parameters of all the sections which are appointed in the thesis are calculated for both different fiber laminas structure blades. In the last of this chapter the blade mode and tip deflection are analyzed under running normally.Finally, we summarize the work of the thesis and discuss some future research directions of the work.The above design and analysis methods are well applicable to the aerodynamic shape of the wind turbine blade. The generating efficiency of the optimized blade can be improved effectively, so generating cost can be reduced considerably. These methods are also useful to improve design level and shorten design period. The data of every sectional characteristic parameter is also required for the next stage comprehensive structure analysis.