Research On Multi Angle Variable Pitch Vertical Axis Wind Turbine

With the rapid development in recent years to enhance the social and public environmental awareness,increasingly exhausted traditional energy,such as wind energy environmentally friendly renewable energy gradually being valued by society.The importance of wind turbines as important equipment for utilizing wind energy is self-evident.Because the manufacture and installation of blades for horizontal axis wind turbines is difficult and easy to damage,the industry has not stopped the research on vertical axis wind turbines.Based on the improvement of the starting performance of vertical axis wind turbines and the efficiency of wind energy absorption and conversion,the paper proposes a wind turbine structure with multi-angle pitch function.The research is carried out from two aspects of the startup characteristics and power characteristics of the wind turbine,and the blade structure is optimized.Compared with the traditional vertical-axis wind turbine,the multiangle pitch-type vertical-axis wind turbine proposed in this paper has better aerodynamic performance and has a higher value for popularization and application.The main research contents of the thesis are as follows.1.Established the theoretical power model of wind turbine.Based on the aerodynamic theory,the motion and force of the blades of the wind turbine are analyzed,and the power model of the wind turbine is established and the relationship between the power coefficient and the blade tip speed ratio is calculated.Comparing the calculation results of the model with the wind energy conversion rate of the traditional vertical axis wind turbine,the results show that the multi-angle pitch type vertical axis wind turbine has good wind energy utilization efficiency.2.Research on the static starting characteristics of a multi-angle pitch-type vertical axis wind turbine.Based on the two-dimensional static fluid simulation method,the static torque output of the wind turbine under static state is simulated.Compared with the static starting performance of the traditional vertical axis wind turbine,the results show that the multi-angle pitch vertical axis wind turbine has good starting characteristics.The wind turbine is simulated by changing the wind speed,azimuth and installation angle,and the influence of different parameters on the startup performance of the wind turbine is studied.3.Research on dynamic power characteristics of multi-angle pitch-type vertical axis wind turbine.Based on the dynamic grid method,the wind turbine is simulated dynamically,and the relationship between the wind turbine power coefficient and the blade tip speed ratio is compared with the theoretical model to verify the accuracy of the calculations.By changing the installation angle and chord length of wind turbine blades to study the influence of various parameters on wind turbine power,the results show that both positive and negative installation angles cannot increase the output power of the wind turbine,and increasing the chord length within a certain range can effectively increase the wind turbine output power.4.Analysis of fluid-structure interaction of multi-angle pitch-type vertical axis wind turbine blades.Based on the three-dimensional dynamic simulation of the wind turbine,the structure analysis of the wind turbine blades is performed under the conditions of severe typhoon weather by using the one-way fluid-structure interaction analysis method.According to the analysis results,the blade structure of the wind turbine is optimized to meet the requirements of use.