柔性叶片叶轮流体动力学特性分析.docx

Abstract
In recent years, the fast growth of total energy consumption leads to the wind power industry develop rapidly and wind power installed capacity increases rapidly each year. At the same time, limited transmission capacity restrains consumption of wind power and the problem of dropping wind power e serious. The development of distributed small wind power system can solve consumption problem. With setting up separate power supply system, the problem of regional power shortage should be solved.
A new type wind turbine which’s blades made of flexible material was designed based on the bionics. Wind can alter the blades profile so that improving the distribution of flow field. The new type wind turbine has simple structure and needs lower start-up wind speed. It is removable. The flexible blade is key object in research project. The law of blade curvature and attack angle effecting on flow field was found. The root cause was also found.
Some experiments and numerical simulation have been plished. In order to facilitate the experimental test, Flexible blade chain wheel was simplified for Array cascade. Blade surface pressure testing experiments have been plished by multi point synchronous pressure measurement technology. Thirty groups of lift coefficient were contrasted and analysed. The best curvature is between and , the best angle is between 15 degrees and 25 degrees. Numerical simulation model of flexible blade was setting up. Ultimately, the results show that best curvature is and best angle is 20 degrees.
Flow field test experiments have been plished by PIV technology and numerical simulation. Forty-two groups distribution of flow field pared. When attack angle less than 20 degrees, boundary layer on suction surface keeps well stream. But when attack angle reaches 30 degrees, adverse pressure gradient on suction surface was increased rapidly so that boundary layer separates and vortexes were produced. Ultimately, the lift-to-dra