引用本文:宣 捷,俞学曾.风障减少尘埃飞起的风洞模拟研究[J].环境科学研究,1997,10(2):14-18.
XUAN Jie,YU Xuezeng.Wind Tunnel Simulation of Dust Emission Prevented by Windbreaks[J].Reserrch of Environmental Science,1997,10(2):14-18.]
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风障减少尘埃飞起的风洞模拟研究
宣 捷,俞学曾
作者单位
宣 捷 北京大学环境科学中心北京 100871 
俞学曾 中国环境科学研究院北京 100012 
摘要:
在环境风洞中对具有相同孔率但孔径不同的11种风障模型(金属网)的流场特性及网后煤堆模型的起尘特性进行模拟实验?结果表明,风障(网)的屏蔽作用取决于网的孔率;孔径雷诺数Re*存在着临界值(该实验为1200),当Re*小于临界值时,网后附近气流的湍流运动受到抑制,此时煤堆模型的起尘率随Re*的减小而减小,且对来流的湍流结构很敏感,当Re*大于临界值时,起尘率基本上不再随Re*变化而变化?
关键词:  风障  起尘率  风洞模拟  
DOI:
分类号:
基金项目:国家自然科学基金(49275247)
Wind Tunnel Simulation of Dust Emission Prevented by Windbreaks
XUAN Jie,YU Xuezeng
Abstract:
This paper describes a wind tunnel investigation of dust emission prevented by windbreaks. 11 windbreaks (wire screens) which are of the same porosity but different holes sizes were tested. The experimental results showed that the shelter effect of windbreaks, i.e. the reduction of mean wind speed behinds the windbreaks, is just dependent on the porosity, but the turbulence will be extinguished just behinds the windbreaks and the dust emission rate will be reduced if the hole size is too small. Therefore, when one modeling the process, the necessary (the main) similarity principles are: i) modeling of the turbulent flow of atmospheric boundary layer, ii) porosity of windbreaks, and iii) aperture Reynolds number Re* .
Key words:  Windbreaks  Dust emission rate  Wind tunnel simulation