| In recent years, Countries around the world make great efforts to developrenewable green energy to partially replace highly polluting traditional energy, Windgenerators which use clean wind energy to produce electricity therefor got a vigorouslydevelopment. By reason of the simple structure and catching the wind from alldirections without a need to orient the blades in the wind directionã€high starting torqueand low cost, the vertical axis wind turbines have broad application prospects in smallwind power generation field. But the vertical axis wind turbines have low coefficient ofwind power, this shortcoming limited its development.In order to enhance the performance of resistance-type vertical axis wind turbine, avertical axis wind turbine’s performance was studied and measures like change thenumber of deflector, increasing the number of layers of the wind turbine were proposedto improve its performance. The paper first described the basic theory of the windturbine and related concepts, and resistance to the vertical axis of the fan average powercalculation formulas were derived; according to the formula, the parameters that affectthe power of the wind turbine such as wind speed, the blades upwind area, bladesstructure, measures were proposed to improve wind turbines performance，that ischoosing the blade structure that have large positive wind resistance and small leewardresistance\adding peripheral devices to improve the performance of the wind turbine.The power output characteristics of the axis wind turbine system were studied viacomputational fluid dynamics. The static torque curve was drawn under different windspeed and different locations of the turbine by using FLUENT software, and researchedthe performance of the wind turbine’s starting torque. The curve of the power of windturbine with the angular velocity at the rated wind speed was also drawn by usingMultiple Reference Frame method to simulation of the rotation impeller, the curveprovide a reference for the wind turbine to choose generatorsã€speed reducers and so on.Different structural parameters of wind turbine have different performance. To improvewind turbine’s aerodynamic performance, different number of deflector, guide outletwind turbine and two-stage wind turbine were simulated to compare which structurewas better. Through the comparison of the various wind turbines on the power\windenergy coefficient\pressure cloud\wind speed cloud\velocity vector, we got the betterwind turbine structure. Numerical simulation should be combined with experiment toaccurately evaluate the performance of a wind turbine. Finally, the different structure ofthe wind turbines were tested in wind tunnel, and obtained consistent results with thenumerical simulation. Wind tunnel experiments and numerical simulation resultscomplement each other mutual authentication，the results obtained for an importantrole in guiding the design of the wind turbine structure. |
