Study on wake distribution under different wind shear characteristics
In view of the insufficient research on the influence of wind shear on wake at present,two lidars were used to carry out wind field experiments in a wind farm,analyzed the phenomenon of wind shear under different wind speeds and the characteristics of wake change under different incoming flow conditions,and used a three-dimensional wake model to verify the vertical wake profiles.The results show that the wind speed has an obvious effect on wind shear,and the wind shear effect increases with the increase of wind speed,and the wind shear index increases about 0.05 for every 1 m/s increase of the wind speed.The wind shear effect has a great influence on the distribution characteristics of the wake.The stronger the wind shear effect is,the greater the gradient of the wake velocity along the height direction,and the greater the width and length of the wake.The predicted curve of the model near the hub center line of the wind turbine and the measured wake data fit well,and the relative errors are basically within 10%,while the relative errors of the prediction near the ground side are large due to the influence of the terrain.
万方数据
维普
