Aerodynamic Performance Prediction Of A High Solidity H-type Wind Turbine

H-type vertical axis wind turbine is an important form of wind power generation machinery, which is currently in its research and development stage. First, the parameters of affecting the aerodynamic characteristics were studied, and stream-tube model was adopted to predict the performance of3.5kw wind turbine. Second, the numerical method was adopted to predict aerodynamic characteristics of wind turbine under different numbers of blades. Final the3D tip tail flow field and the blade wind energy conversion capability were considered. The blade pitch effects on the performance characteristic are considered.The results were shown as follows. The tip speed ratio of high solidity wind turbine is low, and the work scope is narrow. The SST k-co model can predict the aerodynamic performance well in the design condition. The results indicate that the performance of the turbine was mainly dependent on the performance of the blade in the upstream(θ=90°earby); With the increasing of the blade numbers the flow become complicated and the pressure difference between the inside and outside blade decreases, so does the performance coefficient; The distance of the wake field flow velocity recover to the inlet velocity decreases28.1%with the blade number enhanced; The3D numerical prediction show that the tip flow was non-symmetry, the phenomenon is more apparent under low tip speed ratio and it is easy to produce tip eddy; Along the blade exhibition from the center end, wind energy conversion capacity decreased greatly in the93.3%height of the blade,where can be optimized to reduce the loss; In the fixed pitch angle design, negative pitch angle will greatly reduce the performance, while a positive pitch angle will increase the performance.The conclusions presented above are important for the blade numbers picked, the optimum design and pitch angle control.