覆冰拉索气动特性的数值分析  

Numerical Simulation on Aerodynamic Characteristics of Iced Cable

作　　者：黄贻凤[1] 王晓明[1] 

机构地区：[1]华东交通大学轨道交通学院,南昌市330013

出　　处：《公路》2016年第2期70-72,共3页Highway

基　　金：江西省科技厅科研项目;项目编号20151BAB206058;江西省教育厅科研项目;项目编号GJJ14382;华东交通大学校立科研基金;项目编号14GD04

摘　　要：拉索覆冰后改变了拉索的气动外形,从而有可能导致各种类型的风致振动,最有可能产生驰振振动。采用FLUENT软件分别对设置不同覆冰形式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,拉索在设置不同形式的覆冰后,其阻力系数均减小,升力系数没有明显的变化规律,而升力矩系数随不同的覆冰形式其变化趋势不同;对同样类型的覆冰形式,覆冰尺寸越大,其三分力系数越小;不同覆冰形式对拉索的气动效应影响差异较大。The aerodynamic appearance of the cable will change after being covered by ice,which may result in various types of wind-induced vibration in which galloping oscillation is the most likely one. The numerical wind tunnel tests are carried out on the cables covered by different shapes of ice using FLUENT. Tests aim at calculating the three force coefficients respectively to compare with those of the corresponding smooth cables. The result shows that the drag coefficients of the cables covered by different shapes of ice all become smaller,but the lift coefficients have no obvious variation. At the same time the lift moment coefficients have different variation as the ice shape is different. The larger the ice size is, the smaller the three force coefficients are under the condition of same ice shapes. There is great difference in the effects of aerodynamic characteristic of the cables covered by different shapes of ice.

关 键 词：覆冰拉索 数值模拟 气动特性 分析 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]