Research On Wake Effect Of Horizontal Axis Wind Turbine

With the development of science and technology,the shortage of traditional energy is increasingly serious.Wind energy as a clean energy is the inevitable trend of the future world energy development,wind power generation has become one of the best renewable energy for global commercialization.Wind turbine consists of horizontal axis wind turbine and vertical axis wind turbine.Horizontal axis wind turbine includes horizontal axis direct drive wind turbine and horizontal axis double fed wind turbine.At present,horizontal axis direct drive wind turbine is widely used.The wake field of the wind turbine consists of near wake field and far wake field.The near wake field affects the working state of the wind turbine,leading to the decline of the operating life,and the far wake field affects the output power of the wind turbine.In this paper,the effects of the wake effect of wind turbines and the pressure change of the rotor blades in the wake field are studied in combination with the measured and simulated experimental methods.This article mainly studies the following main contents:1.Analyze the aerodynamics of the horizontal axis wind turbine,including the basic theory,aerodynamic parameters,etc.,and complete the three-dimensional model of the wind turbine based on this.The geometric characteristics of the airfoil,the space coordinate points of the blade blade element airfoil,etc.And predict the preliminary experimental data of the wind turbine to prepare for the subsequent work.2.The measured wake method is used to study the wake effects of different layout methods of wind turbines,and the three-dimensional modeling of the experimental layout of wake effects of single wind turbine,double series wind turbines,and two staggered wind turbines is completed.Doppler wind measurement radar is used to measure different cross sections of wind turbine wake field in different layouts,including single wind turbine,double series wind turbine,and two staggered wind turbine wake effect experiments to analyze different wind turbine cross sections.Variations of near wake field and far wake field at different angles.3.Use simulation experiments to study the wake effects of different layouts of wind turbines,complete a three-dimensional model of the wake field of a single wind turbine,two series wind turbines,and two staggered wind turbines,and perform a wake field simulation experiment to obtain a wind turbine Wake field results at different sections.In the end,the experimental results of the wind farm actual measurement and the simulation of the wake field were tested and analyzed.4.In the wake effect,the blade surface pressure distribution is the main factor that affects the operating life of the wind turbine and changes in the near wake field.The surface pressure distribution of the blades in the wake field was studied by using the measured experimental method,and the pressure distribution of the blade surface in the wake field was simulated by using the simulation method.