On low drag aerodynamically stable pe-stay-cables and separation control in the critical Reynolds number domain by newly developed lumped surface roughness

斜拉索的风振是现代斜拉桥抗风设计的重点之一。这主要是由于其低阻尼结构特点和基本为圆形的截面。另一方面，它们的多索布置倾向于增加减少斜拉索的风荷载的重要性，斜拉索的风载变得与其桥面的风荷载的量级相同。本研究通过一系列风洞试验，在临界雷诺数域分离控制的思想下，对新研制的低阻力、气动稳定的集总表面粗糙度PE斜拉索进行了研究。得出花纹粗糙度中网点密度及其排列是控制阻力系数特性和临界雷诺数附近流动分离的两个关键因素。

Wind-induced vibrations of the stay-cables are well known as one of important points in the wind resistant design of the recent cable stayd bridge. They are mainly due to their low damping structural characteristics and basically circular cross section. On the other hand their multi-cable arrangement tends to increase importance of reduction of the wind load of the stay-cables, which become to be of same order as of their deck. In this research newly developed low drag and aerodynamically stable PE stay-cables with lumped surface roughness is illustrated under the idea of separation control at the critical Reynolds number domain through a series of wind tunnel investigation. Density of dots in the patterned roughness and its arrangement are concluded to be two key factors to control the drag coefficient characteristics and the flow separation around the critical Reynolds number.