| 王树鑫,李陆军,赵顺安,黄春花.环境风作用下边界层内速度分布风洞试验研究[J].中国水利水电科学研究院学报,2021,19(3):329-334 |
| 环境风作用下边界层内速度分布风洞试验研究 |
| Wind tunnel experiment of air velocity profile in the boundary layer induced by environment wind |
| 投稿时间：2020-03-04 |
| DOI：10.13244/j.cnki.jiwhr.20200022 |
| 中文关键词: 大气边界层 环境风洞 风速剖面 速度分布 木地板 |
| 英文关键词:atmospheric boundary layer environmental wind tunnel wind profile velocity distribution wood floor |
| 基金项目:中国水利水电科学研究院青年专项（HY0145B352017） |
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| 中文摘要: |
| 尖劈和粗糙元广泛地应用于风洞试验中的大气边界层模拟，虽可模拟不同地貌的平均剖面流速，但存在试验准备周期长、具体操作复杂等问题。为快速准确开展大气边界层平均剖面流速试验，本文在风洞底部铺设了粗糙度约为50 μm木板用以模拟环境地面，采用皮托管测量空气全压和静压的方法，获得了空气流速在木板上方的分布，给出了木板上方边界层的轮廓线与风剖面指数。研究结果表明：风速在风洞测试段木地板上方边界层的分布呈幂函数分布，风剖面指数约为0.172~0.195，这与田野、乡村、丛林、平坦开阔地及低层建筑物稀少地区和树木及低层建筑物密集地区、中高层建筑物稀少地区、平缓的丘陵地的地貌指数接近，且当边界层顶部风速大于9.77 m/s时，指数有随风速的增大而减小的特点。 |
| 英文摘要: |
| The spires and roughness element methods are widely applied in the simulation of atmospheric boundary layer wind tunnel experiments. Although they can simulate the average profile velocity of different landforms，there are some problems such as long test preparation period and complex operation. In order to quickly and accurately carry out the air boundary layer average profile velocity experiment，a wooden board with a roughness of 50μm was laid at the bottom of the wind tunnel to simulate the environmental ground. The distribution of air velocity over the board was obtained by measuring the total air pressure and static pressure by pitot tube， and the contour line and wind profile index of the boundary layer above the board were given. The results show that the distribution of wind speed in the boundary layer above the wooden floor in the wind tunnel test section is a power function distribution， and the wind profile index ranges from 0.172 to 0.195， which is close to the geomorphic index of fields， villages， jungles， flat open land and areas with few low-rise buildings， areas with dense trees and low-rise buildings， areas with few med-high-rise buildings， and gentle hills. When the wind speed is greater than 9.77m/s， the exponent decreases with the increase of wind speed. |
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