底部间隙对防风网抑尘效果的影响  

Effect of a Bottom Gap on Flow Characteristics Behind Porous Fence

作　　者：段振亚[1] 杨文祥[1] 董营营[1] 胡金榜[2] 

机构地区：[1]青岛科技大学机电工程学院,山东青岛266061 [2]天津大学化工学院,天津300072

出　　处：《青岛科技大学学报（自然科学版）》2013年第5期516-519,524,共5页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：山东省优秀中青年科学家奖励基金项目(2008BS09020)

摘　　要：分别对开孔率为0.273的非平面型防风网与0.264的平面型防风网进行了风洞试验研究,并且采用热线风速仪获得了不同底部间隙率(G/H=0.000,0.025,0.075,0.125,0.150,0.175和0.200)的非平面型和平面型防风网尾流区风速分布的数据。通过试验数据计算出不同底部间隙非平面型与平面型防风网尾流区的减风率,并对其进行了分析比较。综合分析可得:非平面型与平面型防风网模型均在底部间隙率(G/H)为0.150时,尾流区具有较好的风速分布和减风率,防风网的抑尘效果最优。The flow characteristics behind a non-planar porous fence of geometric porosi- ty e--0. 273 and a planar porous fence of geometric porosity e=0. 264 with various bot- tom gaps （G） have been investigated by hot-wire anemometer in a wind tunnel experi- ment. Seven gap ratios G/H=0. 000, 0. 025, 0. 075, 0. 125, 0. 150, 0. 175 and 0. 200 of the non-planar and planar porous fences were tested with the free-stream velocity fixed at 10 m · s-1. The experimental data were analyzed and the wind reduction ratios for different gaps of the porous fence were calculated to estimate the shelter effect of the non-planar and planar porous fences. The results show that the gap ratio G/H=0. 150 gives the best shelter effect among the seven gaps of both the non-planar and planar por- ous fence tested in the experiment, having a better mean velocity and wind reduction ra- tio in a large area behind the porous fence.

关 键 词：非平面型防风网 风洞试验 底部间隙率 减风率 

分 类 号：X513[环境科学与工程—环境工程]