Study of Wind Turbine Output Characteristics Considering Unsteady Atmospheric Boundary Layer
Based on the CFD method,this paper develops the output characteristics of wind tur-bines in different atmospheric boundary layers,and analyzes the output characteristics of wind turbines,such as power and wake velocity,in both neutral and non-neutral atmospheric boundary layer environments.Based on the basic parameters of the pre-selected wind turbine,the inlet bound-ary function is constructed by changing the velocity distribution and temperature on the basis of ensuring that the wind speed at the hub is the rated wind speed,and then the CFD analysis of the wind turbine is carried out.The results show that 89％of the incoming velocity is recovered at 15D downstream from the wind turbine under neutral atmospheric boundary layer conditions,while the wake velocity is fully recovered under unstable atmospheric boundary layer conditions.In addition,the overall wake recovery varies among different properties of the atmospheric boundary layer,and the degree of wake recovery is basically the same in the near wake region and the transition region,and the velocity distribution is higher than that in the neutral atmospheric boundary layer under the non-neutral atmospheric boundary layer condition in the far wake region.
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