The effect of wind on size and energy of small simulated raindrops: a wind tunnel study.
The effect of wind on size and energy of small simulated raindrops: a wind tunnel study.
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DOI：
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发表时间：
2000
影响因子：
2.2
通讯作者：
G. Erpul;Donald Gabriëls;D. Janssens
中科院分区：
文献类型：
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作者：
G. Erpul;Donald Gabriëls;D. Janssens
在模拟降雨的风洞中进行了一系列试验，以评价风对液滴尺寸分布和撞击能的影响。水平风速分别为5.7m、10.0m和12.1m S-1，雨量较大(97.2-143.0 mm h-1)，通过调整喷嘴的工作压力，产生了不同的雨滴尺寸分布。中位滴径d50为1.00~1.63 mm。滴径分布随风的变化而变化。与无风降雨相比，风力驱动降雨的水滴直径中值变得更大。伴随降雨的风增加了飞溅杯的飞沙量，这表明动能较大，特别是当风速大于10.0m S-1时。风生和无风降雨之间动能的差异归因于水平风速和喷嘴产生的初始液滴速度的矢量和所产生的较高的撞击速度，而不是液滴大小的变化。
, A series of tests to evaluate the effect of wind on drop size distribution and impact energy were carried out in a wind tunnel with rainfall simulation facility. Horizontal wind speed of 5.7, 10.0, and 12,1 m s -1 was applied with high intensity rainfall (97.2 - 143.0 mm h -1 ) with different raindrop size distributions created by adjusting the nozzle for the operating pressures. The median drop size d 50 ranged from 1.00 to 1.63 mm. Drop size distribution changed with wind. The median drop diameter was becoming larger in wind-driven rain compared to windless rain. Wind accompanying rainfall increased the amount of sand splash from splash cups which indicated higher kinetic energy, especially with winds higher than 10.0 m s -1 . Differences in kinetic energy levels between wind-driven and windless rain are ascribed to the higher impact velocity resulting from the vectorial sum of the applied horizontal wind speed and the initial drop velocity created by the spray nozzle, rather than to the change in drop size.