3D Numerical Simulation On Aerodynamic Performance Of Horizontal Axis Wind Turbine

Wind turbine wind energy is converted to mechanical energy device,known as the wind turbine blade "heart".When the wind passes over the blade surface,it creates a pressure difference to the blade.In the aerospace field,this interaction of fluid with solid is called aerodynamic performance.Studying the aerodynamic performance of the blade has guiding significance for the design of the wind turbine blade.Studying the aerodynamic performance of the blade also improves the wind energy utilization efficiency of the wind turbine.In order to study the aerodynamic performance of wind turbine with different structures under different operating conditions,this paper establishes a three-dimensional aerodynamic model of a real-size horizontal axis wind turbine using CFD method and deeply studies the aerodynamic performance of the wind turbine and its influencing factors.The main findings are as follows:(1)Establishment of 3D Turbulence Aerodynamic Model for Rotating Wind Turbine The multi-reference system(MRF)model is used to deal with the rotational motion of the wind turbine,and the turbulent flow is treated by the shear stress transport model(SST k-?)(2)The wind turbine model in the wind tunnel experiment in the literature is numerically calculated.The simulation results are basically the same as the wind tunnel experiment,which verifies the accuracy of the model.(3)Keep the impeller rotation speed unchanged,and obtain the law of the effect of incoming wind speed on the aerodynamic performance of the wind turbine.In the range of 5m/s-20m/s,the pressure at the front of the blade pressure surface is the highest,and the negative pressure at the suction edge of the blade surface is the lowest.And with the increase of wind speed,the area of positive pressure on the windward side of the blade and the area of negative pressure on the leeward side increase correspondingly.The output shaft power of wind turbine first increases and then decreases with the wind speed.At 15m/s,the output shaft power value reaches the maximum,and the wind energy utilization coefficient reaches the maximum at 8m/s.(4)The effect of impeller rotation speed on aerodynamic performance of wind turbine is studied.When the incoming wind speed is 15m/s,the output speed of the wind turbine first increases and then decreases when the rotation speed is in the range of 0r/min-40r/min.Speed at 33r/min,wind energy utilization factor and the highest output power.With the increase of wind speed,the maximum power of wind turbines and the maximum wind energy utilization coefficient move to the direction of increasing speed.(5)Obtained the number of blades on the wind turbine performance.With the increase of the number of blades,the maximum wind energy utilization factor of the wind turbine increases.In the case of the same wind energy utilization factor,the 2-blade wind turbine needs a larger wind speed and the 4-blade wind turbine needs a larger thrust force at the same rotational speed.And the number of blades increased,manufacturing costs increased.It is recommended to choose 3 blades wind turbine.(6)The influence of blade mounting angle on aerodynamic performance is analyzed.Increasing the blade mounting angle will reduce the flow separation,reduce the stall delay phenomenon,and increase the power of the wind turbine.