雨滴撞击板式建筑的理论预测

G.G. Rodgers , G. Poots , J.K. Page , W.M. Pickering
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引用次数: 18

摘要

Wise, Sexton和Lillywhite利用风洞中的比例模型测量了平板式建筑周围的湍流气流。利用这些数据,我们开发了计算半径r在0≦r≦2500 μ范围内,梯度风速达26.8 m/s时雨滴轨迹的程序。得到了液滴大小固定时的掠射轨迹,并由此推导出建筑物的有效碰撞截面。利用Best的液滴大小分布,对给定的降雨强度,评估了雨滴在建筑物上的撞击率。建立了近似分析方法来预测碰撞率及其与建筑物宽高比的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Theoretical predictions of raindrop impaction on a slab type building

The turbulent air flow around a slab type building has been measured by Wise, Sexton and Lillywhite using a scale model in a wind tunnel. Using their data procedures are developed for calculating raindrop trajectories for droplets having radius r in the range 0 ≦ r ≦ 2500 μ with gradient wind speeds up to 26·8 m/s.

Grazing trajectories, for fixed droplet size, are obtained and from these the effective collision cross-section of the building is deduced. Employing the droplet size distribution of Best, for a given rainfall intensity, raindrop impaction rates over the building are evaluated. Approximate analytical methods are developed to predict impaction rates and their dependence on the building aspect ratio.

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