湍流度对覆冰导线气动力特性影响的试验研究  

Experimental Study on Effect of Turbulence Intensity on the Aerodynamic Characteristics of Iced Conductors

作　　者：阎东[1,2] 吕中宾[2] 林巍[3] 楼文娟[4] 

机构地区：[1]国网河南省电力公司电力科学研究院,郑州450052 [2]国网河南省电力公司,郑州450052 [3]浙江大学建筑设计研究院有限公司,杭州310027 [4]浙江大学结构工程研究所,杭州310058

出　　处：《高电压技术》2014年第2期450-457,共8页High Voltage Engineering

基　　金：国家自然科学基金(51178424)~~

摘　　要：为研究风场湍流度对覆冰导线气动特性的影响,对D形和4种不同冰厚的新月形覆冰导线进行了风洞试验。分别在均匀流、5%和13%这3种均匀湍流场中,获得了0～180°攻角范围内单导线和6分裂导线的气动三分力系数,考察了2种不同形状覆冰时导线截面的气动力特性。同时,根据Den Hartog竖向和Nigol扭转舞动机理,讨论了覆冰导线的驰振不稳定攻角范围,为覆冰导线的舞动计算分析提供了有效参考。研究结果表明:湍流会降低新月形覆冰导线的气动稳定性,其中5%的湍流场对弛振稳定性的影响最为不利。然而对D形覆冰导线而言,湍流仅会略微改变气动力系数的幅值,不会影响其随攻角的变化规律;此外,湍流会提高D形覆冰导线的竖向弛振稳定性,而对扭转弛振稳定性几乎没有影响。In order to determine the impact of incoming flow turbulence on the aerodynamic characteristics of iced con- ductors, we investigated aerodynamic force of iced conductors through wind tunnel test, in which a D-shaped conductor and four crescent-shaped ones covered with ice of different thickness were adopted. Aerodynamic coefficients of single and 6-bundled iced transmission line were obtained at wind angles from 0° to 180° in three kinds of airflow, namely uni- form, homogeneous turbulence of 5% and 13% intensity. The patterns of aerodynamic forces on the iced conductors with respect to wind angles of attack were systematically studied. Then, based on the Den Hartog and Nigol＇s mechanisms of instability for vertical and twist directions, respectively, the unstable galloping regions of attack angel was discussed, which could be referred by researches on galloping of iced conductors. The results show that the incoming flow turbu- lence reduces the aerodynamic stability, which turns out to be most severe on the turbulence of crescent iced conductors in 5% turbulence airflow. For D-shaped conductors, turbulent intensity only slightly enhances their vertical aerodynamic stability, while barely influence their twist aerodynamic stability.

关 键 词：覆冰导线 驰振 风洞试验 湍流度 气动力特性 舞动机理 

分 类 号：TM752.5[电气工程—电力系统及自动化] TU311.3[建筑科学—结构工程]