Abstract:

The force and structural stability of new type deflector-porous fence and traditional flat-porous fence with square or circular hole and porosity of 30% for all the three kinds of fences were studied using CFD software Fluent 6.2. The results showed that there was no obvious increase about wind load between deflector-porous fence and tradition ones, and the wind-load increased with increasing wind speed, showing a quadratic growth. The wind-load growth about 20 times when wind speed increased from 3 m·s^-1 to 15 m·s^-1. There was no obvious difference of the ratio of force arm and fixed fence high among different fences and little change with increasing wind velocity. The main reason of the formation of porous fence resistance was the different pressure before and after fence and the development of trailing vortex turbulence.

Key words: deflector-porous fence, numerical simulation, force analysis, structural stability

摘要：

应用CFD模拟软件Fluent 6.2对开孔率30%的新型导流型防风网与传统方孔、圆孔平板网的受力与结构稳定性进行了研究。分析了不同风速下方孔、圆孔、导流型3种不同开孔型式网板受风荷载作用情况。模拟结果表明:导流型防风网受风荷载作用与传统方孔、圆孔网板相比差别不大,且风荷载都是随着风速不断加大,呈现二次方性增长,当风速由3 m·s^-1增加到15 m·s^-1时,风荷载增长约20倍;不同开孔网板的力臂与固定网高之比相差不大,且随来流风速增加变化不大;产生网板阻力的主要原因是网板近壁面的前后压差和网后气流湍动形成的拖曳涡。

关键词: 导流型防风网, 数值模拟, 受力分析, 结构稳定性