拉索间距及覆冰对双索尾流驰振的影响-《建筑科学与工程学报》

文章信息/Info

Title:: Influence of Double Cable Spacing and Icing on Wake Galloping of Cable

Author(s):: TAN Dong-mei, MAO Shan-ming, LUO Su-zhen, QU Wei-lian, LI Xiao-min, LI Xu-yang; Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology

Keywords:: fan-shaped icing; spacing of cables; wake galloping; aerodynamic coefficient; galloping coefficient

摘要:: 利用FLUENT中的SST模型对不同索距的扇形覆冰双索和无覆冰双索绕流场进行三维数值模拟，得到下游索在0°~90°风攻角下的阻力系数、升力系数以及驰振力系数，进而研究两索之间的距离、风攻角及有无覆冰等条件对双索尾流驰振稳定性的影响。结果表明：覆冰双索三维数值模拟结果与无覆冰双索三维数值模拟结果差异较大；覆冰双索比无覆冰双索更易发生尾流驰振失稳；拉索间距越近，发生尾流驰振的可能性更大，当覆冰拉索间距超过一定范围时，不会发生尾流驰振失稳；双索发生尾流驰振的风攻角范围与拉索之间的距离有关，拉索间距越近，发生尾流驰振失稳的风攻角越小；不同间距双索的绕流场存在很大差异，当拉索间距较近时，类似于单钝体绕流。

Abstract:: The three dimensional numerical simulation of the flow fields of fan-shaped icing double cables and ice free double cables with different cable spacings were carried out by using the SST model in FLUENT. The drag coefficient, lift coefficient and galloping force coefficient of downstream cables at 0°-90° wind attack angle were obtained. Furthermore, the influences of the spacing between two cables, the wind attack angle and the icing condition on the wake galloping stability of the double cables were studied. The results show that the three dimensional numerical simulation results of icing double cables are different from the numerical simulation results of ice free double cables. The icing double cables are more susceptible to wake galloping instability than the ice free double cables. The closer the cable spacing is, the more likely the wake galloping is. When the spacing between icing double cables exceeds a certain range, no wake galloping instability will occur. The range of the wind attack angle between the two cables is related to the spacing between the cables. The closer the cable spacing is, the smaller the wind attack angle is when the wake galloping is unstable. There is a great difference in the flow field around double cables with different spacing. When the cable spacing is close, it is similar to the flow around a single bluff body.