平板型高层建筑风能集聚效应研究

Wind energy gathering effect of flat plate high-rise buildings

为研究平板型高层建筑的风特性影响,本文采用CFD数值模拟方法,以表面风压、风速增大系数作为评价指标,选取风机安装高度、风向角等作为控制变量,通过建立多组工况研究建筑物周围风能集聚效应。结果表明:对于不同的开洞高度,通道内的风压是比较均匀的,随着开洞高度的增加,洞口表面风压会逐渐增大;而风场的风压系数随着建筑物的高度方向是比较均匀的,大约在建筑全高2/3处到达最大;随着风向角的增大,建筑背风面的驻涡会逐步往洞口通道侧移动,当风向角约为15°-30°和60°-75°时,建筑尾流区有"卡门涡街"现象发生。

CFD numerical modeling is used to investigate the wind energy gathering effect of flat plate high-rise buildings with square cross-section from the installation height of fan and wind angles.The study explores the wind energy gathering effect by comparing wind pressure and the increased coefficient.The results show that the wind pressure in the channel is relatively uniform,the wind pressure around the surface of the channel increases with the growth of the channel height.The wind pressure coefficient is also uniform with the height of the building, and reaches to the maximum value at the 2/3 height of the building.The vortex on the leeward side of the building will be gradually toward the tunnel channel side with the increase of the wind angle,the phenomenon of ＂Karman vortex street＂ occurs in the wake zone when the wind direction angle is about 15°-30° and 60°-75°.