风电场运行对局地边界层气象因素影响

INFLUENCE OF WIND FARM OPERATION ON METEOROLOGICAL FACTORS IN BOUNDARY LAYER

以5 MW风力机组成的风电场为研究对象,采用湍流理论和大气流动特征,分析不同下垫面情况下风电场运行时局地边界层气象因素的变化过程,利用UDF函数编译风电场入口边界条件及不同的地表粗糙度,并利用风洞试验验证模型计算的正确性。研究表明,风电场的存在会减小边界层大气能量并增加湍流动能,具体结果表明:风电场下游风速减小,且风速随着地表粗糙度的增大逐渐降低,速度恢复率逐渐降低;湍动能随着地表粗糙度的增大空间非均匀分布特性更加明显;温度沿垂直方向略微降低,且随着地表粗糙度的增大影响程度加深;同时随着风电场装机规模的不断扩大,其影响范围及程度也增大。

Taking the wind farm composed of 5 MW wind turbines as the object of study,the turbulence theory and the characteristics of atmospheric flow are used to analyze the change process of the meteorological factors of the wind current field and the ground boundary layer under different underlying surface conditions. Using UDF function to compile wind farm inlet boundary condition and different surface roughness. The correctness of model calculation is verified by wind tunnel test. The research shows that the wind farm,will reduce the energy and increase of atmospheric boundary layer turbulence kinetic energy,the results are as follows:the downstream wind farm wind speed decreases,and the surface roughness decreases,the speed of recovery rate decreased;the turbulent kinetic energy with surface roughness increase of spatial nonuniform distribution of temperature along the more obvious;the vertical direction decreased slightly,and with the influence of surface roughness increases and the deepening of. At the same time,as the wind farm installed scale continues to expand,the scope and extent of its impact also increased.