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首页> 外文期刊>Building and Environment >Experimental study of thermal plumes generated by a cluster of high-rise compact buildings under moderate background wind conditions
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Experimental study of thermal plumes generated by a cluster of high-rise compact buildings under moderate background wind conditions

机译：中等背景风条件下高层紧凑型建筑物产生的热羽毛的实验研究

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When background wind is moderate, urban environment may face great challenges as removal ability of airborne pollutants, anthropogenic heat and moisture reduces. Under this condition, buoyancy-driven flow can break the dominant role of the background wind and affect the urban environment greatly. Knowledge of buoyant flow dynamics is essential for understanding urban wind/thermal environment and related pollutant transport.As one important buoyant flow, thermal plumes generated by a cluster of high-rise compact buildings are modelled using a laboratory water channel in this study. Flow similarity, when the buoyancy is prominent, is well satisfied. Mean flows, turbulent statistics, and rising features under different Froude (Fr) numbers are systematically explored by two-dimensional particle image velocimetry (PIV) technique.Overall, the transition of buoyancy-dominated and wind-dominated flow dynamics is observed when Fr number varies. For horizontal and vertical velocity components, peak magnitude and position are quantitatively determined on four building poles. Fr number obviously changes the relative magnitude of v-peak among four poles. Turbulence statistics, including velocity variance, turbulence kinetic energy, power spectral density, turbulent momentum flux, and turbulence production, are systematically analyzed, which show consistent results. As Fr number decreases, the plume mixing is enhanced. When particularly aiming at the plume region, smaller Fr numbers usually make the maximum velocities occur more in the plume central part rather than the boundaries. A quantitative rational function is given to describe the relation between Fr number and the rising angle, as a = 8.76/(Fr-q + 0.097).
机译：当背景风适中时，城市环境可能面临巨大的挑战，因为空气污染物的去除能力，人为热量和水分减少。在这种情况下，浮力驱动的流动可能会破坏背景风的主导作用，大大影响城市环境。对浮力流动动态的了解对于了解城市风/热环境和相关污染物运输至关重要。一种重要的浮力流动，通过本研究中的实验室水通道模拟了一组高层紧凑型建筑物产生的热羽。流动相似性，当浮力突出时，很满意。通过二维粒子图像速度（PIV）技术来系统地探索不同FRoude（FR）编号下的平均流量，湍流统计和上升特征。（PIV）技术）。overall，在FR编号时观察到浮力主导和风极主导的流动动力学的转变不同。对于水平和垂直速度分量，在四个建筑杆上定量确定峰值幅度和位置。 FR编号显然改变了四个极之间的V峰值的相对幅度。系统地分析了湍流统计，包括速度方差，湍流动能，功率谱密度，湍流动量通量和湍流产生，结果显示了一致的结果。随着FR编号减少，增强了羽流混合。当特别瞄准羽流区域时，较小的FR数通常使最大速度在羽流中央部分而不是边界中发生更多。给出了定量的合理功能来描述FR编号与上升角之间的关系，如A = 8.76 /（FR-Q + 0.097）。

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