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采用CFD方法,对放置于某风场的长方形平顶建筑物(长×宽×高=12.4 m×2.4 m×3.1 m)顶面的风资源特征进行模拟计算,计算中同时考虑中性大气边界层和地表粗糙度的影响,分析4个不同风向条件下建筑物顶面15个参考位置的风速增大系数和湍流强度随高度的变化规律,确定屋顶风力机的适合安装位置和高度。结果表明:平顶建筑物顶面安装风力机时其安装高度至少要达到1.3H(H为建筑物高度),以避开强湍流区域;在高于建筑物顶面0.5H高度后,建筑物顶面各位置出现风速增大现象,而当高于建筑物顶面2.0H后,风速增大系数趋于定值;当风力机安装高度高于建筑物顶面0.5H~2.0H时,长方形平顶建筑物顶面15个参考位置均可安装风力机。
The CFD method is used to simulate the wind resource characteristics of the top surface of a rectangular flat-roofed building (length × width × height = 12.4 × 2.4 × 3.1 m) placed in a wind farm, taking into account the neutral atmospheric boundary Layer and surface roughness. The wind speed increasing coefficient and turbulence intensity with altitude of 15 reference positions on the top of building under four different wind directions were analyzed to determine the suitable installation location and height of the roof wind turbine. The results show that the installation height of the wind turbine should be at least 1.3H (H is the height of the building) to avoid the strong turbulence area when the wind turbine is installed on the top of the flat roof. After the height of 0.5H above the top of the building, When the wind turbine installation height is higher than the top of the building 0.5H ~ 2.0H, the rectangle Wind turbines are installed at 15 reference positions on the top of the flat roof.