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建立了风力机及风场模型,根据地表粗糙度划分的4类不同地貌设置不同的下垫面,编译下垫面所对应的风速廓线作为风电场入口的边界条件,应用Fluent软件模拟分析不同下垫面下风力机下游的风速及湍动能.结果表明:随着地表粗糙度的增加,风力机下游风速逐渐降低,且在轮毂高度处的流场出口速度与对应入口速度的比值整体上呈现降低的趋势,由A类地形到D类地形,速度恢复率分别为98%、98%、94%和92%;风力机下游分布较均匀的湍动能也随着地表粗糙度的增加变得更加紊乱;不同的下垫面将会不同程度地改变风力机下游空气流动,使近地面的风速及湍动能发生变化.
The wind turbine and wind farm model are established. According to the four different landforms divided by surface roughness, different underlying surfaces are set, and the wind speed profile corresponding to the underlying surface is compiled as the boundary conditions of wind farm entrance. Fluent software is used to simulate the different The wind speed and turbulent kinetic energy downstream of the wind turbine under the underlying surface.The results show that with the increase of surface roughness, the wind speed downstream of the wind turbine decreases gradually, and the ratio of the flow field exit velocity to the corresponding inlet velocity at the hub height is overall The speed of recovery from the topography to the topography of the top D is 98%, 98%, 94% and 92% respectively. The more uniform turbulence kinetic energy of the downstream wind turbine also increases with the increase of surface roughness The different underlying surfaces will change the air flow downstream of the wind turbine to varying degrees, so that the wind speed and turbulent kinetic energy of the near ground will change.