Integrated Design And Realization Of Driving Mechanism For Blades Oriented Power Optimization And Vibration Control

Vortex generators(VGs)are effective flow control devices and they are commonly employed to control flow separation.However,the current VGs are passive and installed at a stationary angle on the surface of blades.Passive VGs are unable to adjust the incidence angle according to external wind load.Therefore,an active driving mechanism based on electromagnetic driving technology for VGs are developed to control the blades vortex-induced vibrations and optimize the output power.The driving mechanism,installed in the interior of the blades,is able to adjust the incidence angle of VGs actively according to the variation of wind loads,depressing the fluctuation of output power and aerodynamic characteristics.Therefore,wind turbine could operate with steady and high efficiency.The main contents include the following aspects:(1)The basic theories of aerodynamics of wind turbine blades and vortex generators are introduced,including the flow control theory of VGs.Besides,flow simulation on the plate with VGs is conducted to analyze the effects of VGs incidence angle and layout on the plate flow.(2)The aerodynamic performances of three dimensional airfoil with VGs are computed,focusing on the effects of incidence angle of VGs on aerodynamic performances of the airfoil S809.In addition,compare the aerodynamics of original airfoil with the airfoil installed with VGs to explore the effects of VGs.The power optimization and vortex-induced vibration control of wind turbine blades are analyzed according to the aerodynamic simulation of 3D blades with VGs.(3)The preliminary driving schemes are developed according to the results of flow simulation and the basic theory of electromagnetism.Magnetic fields of driving mechanism are simulated by ANSOFT to meet the requirements of driving system.Besides,the structure strength of driving mechanism and the modal of pivotal parts are analyzed to ensure the actuator is simple easy-manufactured and with wonderful frequency response characteristics.The actuator is simplified to establish the kinetic equations,and the systematic control model is developed based on the kinetic equations by SIMULINK to evaluate the performances of the actuator.(4)Manufacture and test the prototype of the actuator.A testing platform is established explore the characteristics of the actuator.Testing process of the actuator is introduced and the control model is developed by Labview,and experiments of actuator properties testing are conducted.Finally,systemwide simulation is conducted by combined the flow simulation results with the actuator testing results.