Optimization Of Blade Parameters And Experimental Study Of Small Horizontal Axis Wind Turbine

Wind turbine power generation technology is the main way to utilize wind energy.The blade is the main component of the wind turbine,which directly affects the efficiency of the wind turbine.Small wind turbines work in low wind speed outdoor environment.Natural uncontrollable factors have serious impact on the start-up and power output performance of wind turbines.Taking a small-scale horizontal axis wind turbine as the research object,this paper analyzes and optimizes the aerodynamic performance of the wind turbine for low wind speed area.Considering the startup and power output problems of the small wind turbine,an experimental platform was set up to study the influence of surface roughness on the performance of the blade of a small wind turbine.The feasibility of using vortex generators to improve the performance was investigated,the aerodynamic performance of the law was obtained and the reference to the design and application of small wind turbines is provided.The main contents of this paper are follows:1.The calculation model of wind turbine aerodynamic performance was established based on the modified blade element momentum theory and the impact of blade tip loss on the aerodynamic performance of the wind turbine was analyzed.Small wind turbine design analysis software was compiled to analyze the influence of the blade design parameters on the aerodynamic performance of the wind turbine,the effects of the design parameters and changes in wind turbine performance characteristics in the low wind area and high wind speed area were obtained.2.Taking into account the characteristics of low wind resources,the parameters such as the design angle of attack,tip speed ratio,chord length and twist angle were used as variables,with annual power generation and starting torque as the optimization objectives,and the multi-objective optimization algorithm was used for blade start-up and power output performance optimization of small wind turbines.An indoor wind turbine aerodynamic performance test platform was built to verify the proposed optimal design method.3.Based on the experimental platform,the effects of surface roughness of different thickness and position on the performance of wind turbine start and power output were analyzed.The influences law of wind turbine blade surface roughness on performance were obtained.4.The vortex generator was designed and experiment methods were used to research the influence of vortex generators with different positions,sizes and pair spaces on the startup and power output performance of the small wind turbine.The feasibility of the vortex generator to reduce the sensitivity of the blade roughness was investigated.