多孔形风屏障防风性能的足尺模型风洞试验及数值模拟研究

Full-Scale Wind Tunnel Test and Numerical Simulation for Wind-Resistant Performance of Porous Wind Barrier

通过风屏障足尺模型风洞试验测试了多孔形风屏障后方两轨道中心处的平均风速和湍流强度,并提出一种适用于多孔形风屏障的二维等效模拟方法。在保证风屏障整体透风率不变的情况下,建立不同透风率分布的风屏障模型,讨论不同透风率分布对其后方流场特性及风荷载的影响。结果表明:本文提出的二维等效透风率法能较好地模拟多孔形风屏障的防风性能,该方法具有建模简便、计算较快等优点。随着上部障条透风率的增加,屏障阻力系数先增加后减小,力矩系数逐渐减小。不同透风率分布的风屏障对其后方等效风速的影响较为显著。

The mean wind speed and turbulence intensity at the center of two tracks behind the porous wind barrier were measured by full-scale wind tunnel test of wind barrier model,and a two-dimensional equivalent porosity method was proposed to simulate the porous barrier.Under the condition that the overall ventilation rate of the wind barrier remains unchanged,a wind barrier model with different ventilation rate distribution was established,and the influence of different ventilation rate distribution on the flow field characteristics behind the wind barrier and wind load was discussed.The results show that the two-dimensional equivalent porosity method proposed in this paper can better simulate the wind resistance performance of porous wind barrier,and this method has the advantages of simple modeling and fast calculation.With the increase of ventilation rate of the upper strips,the resistance coefficient first increases and then decreases,and the moment coefficient gradually decreases.The wind barrier with different ventilation distribution has a significant effect on the equivalent wind speed behind it.