带水线的斜拉索气动特性数值分析

Numerical Simulation on Aerodynamic Characteristics of Stayed Cable with Waterline

拉索的风雨激振是振幅最大、危害最严重的一种风致振动。采用FLUENT软件分别对设置不同大小和形状的水线的拉索进行数值风洞试验,计算各种工况拉索的三分力系数,并与同条件下的光面拉索进行对比研究。计算表明:水线对拉索的三分力系数的影响很大,设置水线后三分力系数均明显变小,水线的存在可能导致拉索的不稳定;而水线高度对三分力系数的影响不明显。

Rain-wind-induced vibration of stayed cables is one type of wind-induced vibration with the maximum amplitude and the most serious damage. By using FLUENT software, this study carries out numerical wind tunnel tests on cables with waterline of different sizes,calculates three force coefficients respectively, and then compares results with those of the corresponding smooth cables. Results show that waterline has great influence on the three force coefficients of cables and the three force coefficients all become smaller obviously after setting up waterline. It concludes that the presence of waterline may lead to aerodynamic instability of stayed cables, but the height of the waterline has no obvious influence on three force coefficients.