Study On Experiment Of The New Dedicated Wind Turbine Airfoil

Wind turbine is an electrical power generation equipment composed of blades, transmission system, generators, energy storage equipment, tower and electrical systems. The good aerodynamic performance is crucial to obtain more wind power. As the basic component of the blade, the geometric parameters and aerodynamic characteristics of the wind turbine airfoil are directly affect the performance and power of wind power equipment. Study on aerodynamic performance of the dedicated wind turbine airfoil is conducive to improve the domestic independent R & D capability and the establishment of dedicated wind turbine airfoil database. Actual characteristics of the airfoil require to be test and verified through experiment, laying the foundation for industrial application.The project is sponsored by National Natural Science Foundation of China (No: 50775227). In the airfoil design, any possible blade airfoil profile is characterized by generalized functional equation, a new dedicated wind turbine airfoil WT180 is developed by applying the multi-objective genetic algorithm, To illustrate the aerodynamic performance of the dedicated wind turbine airfoil, the dissertation proposes a research project"Study on experiment of the new dedicated wind turbine airfoil". After analyzed by the airfoil design and analysis software RFOIL, the novel airfoil shows excellent geometric parameters and compatibility with other wind turbine airfoils. The pointed tail edge is closed, leading to eliminate the working noise to a large extent. The novel airfoil is non-sensitive to the front edge rough conditions, and has a satisfactory stalling characteristic. The computing results show that the airfoil possesses good aerodynamics characteristic under the design and the off-design conditions.Upon investigation on the similitude model of the dedicated airfoil of wind turbine, a novel airfoil model and the corresponding experimental model are provided, after analyzed the test equipment, test principle and the test procedure, the wind tunnel experiment is executed in low-speed wind tunnel by manometric method. Then, when the Reynolds number is 2.0×106,3.0×106,4.0×106 respectively, the aerodynamics characteristics are obtained under the working conditions of free transition and the fixed transition, the corresponding theoretical wind speed of Reynolds number is 37.5 m/s,56.25m/s,75m/s respectively, the variation range of the attack angle is -10°~25°. After pasted the rough band on the 5% chord edge of the upper and bottom of the model to get boundary layer transition, the maximal rough airfoil conditions in practice is simulated, the results show that the airfoil has high lift coefficient and lift-drag ratio in the working conditions of free transition and the stationary transition, it meets the working requirement of the wind turbine for its aerodynamics characteristics under the design and the off-design conditions, the lift and drag linear change phase of experiment results are all agree well with the corresponding calculation parameters. in the same working condition, the slope of the lift curve increases and the resistance decreases with the increasing of Reynolds numbers, which agree with the Reynold number influencing rule basically. The test indicates the airfoil is non-sensitive to the front edge rough conditions, and has a satisfactory stalling characteristic. The results of test are consistent with the calculated results.The experimental investigation on WT180 airfoil illustrates the validity of the calculating model for the boundary layer flow field by RFOIL, and the advantages of theoretical design of the airfoil is also verified. Meanwhile, the feasibility and effectiveness of the similitude model method, wooden model manufacturing method with steel beams and the manometric method are proved by the experiments as well.