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A wind tunnel study of effects of twisted wind flows on the pedestrian-level wind field in an urban environment

机译：风洞研究扭曲风对城市环境中行人风场的影响

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The influence of twisted wind flows on the pedestrian-level wind (PLW) field of an urban area was evaluated by testing a typical urban site (Tsuen Wan, Hong Kong) in a boundary layer wind tunnel. Four twisted wind profiles with different magnitudes and directions of yaw angles were employed to investigate variations in wind speed with the properties of the twisted wind flows at the pedestrian level. An additional conventional wind profile with similar wind speeds and turbulence intensities to the twisted winds but with zero yaw angles was simulated for comparisons. The mean wind speeds at 77 locations including the perimeter, roadsides, and groups of high-rise buildings were analysed for the conventional and the four twisted wind flows. The comparisons show a tendency of twisted winds to generate higher wind speeds at the pedestrian level than the conventional wind profile. The wind speeds of the twisted winds have a strong dependence on the magnitude and direction of the yaw angles, particularly at locations where the densities of buildings in the neighbourhood are low and hence local wind circulations are significantly modified by the twisted winds.
机译：通过在边界层风洞中测试典型的城市站点（香港荃湾），评估了扭曲风流对市区行人风（PLW）场的影响。四个具有不同大小和偏航角方向的扭曲风廓线被用来研究风速的变化以及在行人水平上的扭曲风的特性。为了进行比较，模拟了附加的常规风廓线，该风廓线具有与扭曲风相似的风速和湍流强度，但偏航角为零。分析了传统风向和四个扭曲风向的77个位置的平均风速，包括周长，路边和高层建筑群。比较结果表明，与传统风廓线相比，扭曲风倾向于在行人水平上产生更高的风速。扭曲风的风速强烈依赖于偏航角的大小和方向，尤其是在附近建筑物密度较低的位置，因此扭曲风会显着改变局部风的循环。

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