憎水涂层对铝单丝表面覆冰性能的影响

Influence of Hydrophobic Coating on Ice Accretion on Aluminum Conductor

为研究憎水性涂层对铝单丝表面覆冰性能的影响,在低温过冷水条件下,利用实验室导线覆冰模拟系统试验研究了不同憎水性铝单丝表面覆冰的形成过程。研究发现:用普通憎水涂层涂覆铝单丝虽不能抑制表面覆冰的形成和增长,但可以延缓表面覆冰层的形成时间;硬脂酸涂覆制备的超憎水铝单丝表面可以有效抑制表面覆冰的形成和增长。分析表明:普通憎水性表面可以抑制表面附着水滴的湿润和扩散,但表面附着水滴与涂层间的作用力较大,水滴滑行角较大,水滴不易滑落表面;硬脂酸涂覆制备的超憎水铝单丝表面具有特殊的微纳米结构和较小的水滴滑行角,不利于水滴的粘附和冻结。

Ice accretion on high voltage overhead transmission lines causes many serious accidents in power systems. In order to restrain ice accretion on the transmission lines, the ice accretion of different hydrophobic aluminum conductors was investigated under a low temperature condition. It is found that the hydrophobic coating can delay the formation time of a layer of ice on the aluminum conductors, but it can not restrain ice formation and accretion. However, the superhydrophobic coating can largely prevent ice formation and accretion on the aluminum conductor surface. Water droplet can not wet hydrophobic surface easily, which postpone the formation time of a layer of ice on the aluminum conductors. However the adhered water droplet can not slid from the surface easily, which result ice being frozen and ice accretion with a long time of spraying. Water droplet would slide from the superhydrophobic surface easily with small water sliding angle, which prevent ice formation on the aluminum conductor surface.