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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。
Cable icing changed the aerodynamic shape of the cable, which may lead to various types of wind-induced vibration, the most likely to produce galloping vibration. The FLUENT software was used to conduct numerical wind tunnel tests on cables with different icing forms. The third-component force coefficients of cables for various conditions were calculated and compared with the smooth cables under the same conditions. The calculation shows that the resistance coefficient of the cable decreases with the different types of icing applied, and the lift coefficient has no obvious change rule, while the variation of the torque coefficient with different icing forms is different. For the same type of icing Form, the larger the icing size, the smaller the third-component force coefficient; the different ice-coating forms have different effects on the aerodynamic effects of the cables.