湍流度对覆冰导线气动力特性影响的试验研究

发布时间：2018-01-15 11:09

本文关键词：湍流度对覆冰导线气动力特性影响的试验研究　出处：《高电压技术》2014年02期 　论文类型：期刊论文

【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。
[Abstract]:In order to study the effect of wind turbulence on the aerodynamic characteristics of ice-coated conductors, wind tunnel tests were carried out on D-shaped and four kinds of crescent ice-coated conductors with different thickness of ice, in which the uniform flow was 5% and 13%, respectively. The aerodynamic force coefficients of single conductors and six split conductors in the angle of attack range of 0 ~ 180 掳are obtained. The aerodynamic characteristics of the cross-sections of two kinds of icy conductors with different shapes are investigated. Based on the vertical and Nigol torsional galloping mechanism of Den Hartog, the range of unstable angle of attack of iced conductor is discussed. The results show that turbulence will reduce the aerodynamic stability of the crescent ice conductor. The turbulence field of 5% has the most adverse effect on the stability of relaxation vibration. However, for the D-shaped ice-coated conductor, the turbulence will only slightly change the amplitude of aerodynamic coefficient, and will not affect the variation of the angle of attack. In addition, turbulence can improve the vertical relaxation stability of D-shaped ice-coated conductors, but have little effect on the torsional relaxation stability.
【作者单位】：国网河南省电力公司电力科学研究院;国网河南省电力公司;浙江大学建筑设计研究院有限公司;浙江大学结构工程研究所;
【基金】：国家自然科学基金(51178424)~~
【分类号】：TM752.5;TU311.3
【正文快照】： 0引言覆冰会造成导线截面气动力特性的改变,并引发导线的大幅舞动,从而进一步造成输电线路相间闪络、金具损坏,甚至导致线路跳闸停电、断线倒塔等恶性事故[1-3]。自20世纪30年代起,很多国外研究学者便开始通过风洞试验及数值模拟研究导线的舞动机理和防治措施[4-5]。由于覆

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