非平面型防风网尾流区流体特性试验研究

在理论风洞中对具有不同开孔率的平面型与一种非平面型（蝶形）防风网进行了试验研究,利用防风网尾流区内的平均风速分布和减风系数对平面型和非平面型的试验数据进行分析比较,结果表明：①平面型防风网开孔率为0.23~0.32时减风效果良好,非平面型开孔率为0.25~0.35时减风效果较好。②在开孔率、开孔形状及开孔分布相似条件下,平面型防风网减风效果略高于非平面型防风网,但非平面型网片刚度远大于平面型网片,具有较高的工程应用与推广前景。

Experimental Study on the Flow Characteristics of Wake behind Non-planar Porous Fences

Planar and a type of the non-planar porous fences with different porosities have been investigated experimentally in a wind tunnel.About three hundred mean velocity fields for each fence were measured consecutively by hot-wire anemometer.The experimental data were analyzed and wind reduction coefficients for each point were obtained to estimate the shelter effect of por-ous fence models.According to the experiment results: ①the optimum porosity of the planar porous fence is found to be around 0.23~0.32,while the optimum porosity of the non-planar porous fence is found to be around 0.25~0.35;②the shielter effect of the planar windbreak is a little better than the non-planar windbreak under the same conditions of the porosity,the shape and the distribution of the hole.But with the superiority of the stiffness,the non-planar porous fences do have higher engineering application and promotion prospects.