输电线路覆冰时导线表面形状对碰撞系数的影响

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摘要输电线路覆冰是过冷却水滴与导线碰撞并被捕获的物理过程。在计算其碰撞系数时,通常采用外表面为圆形的简化模型代替实际绞合导线模型,这在一定程度上降低了计算的精确性。以流体力学理论为基础,运用Fluent软件模拟了过冷却水滴与简化模型和实际模型发生碰撞的过程,通过对比分析了导线表面形状对空气速度、水滴速度和轨迹以及碰撞系数的影响。结果表明,相同条件下,与简化模型相比,实际模型导线周围的空气速度更小,水滴速度也更小,绕流现象更加明显,轨迹也更向外部扩张,实际模型的碰撞系数更小。因此,为保证覆冰模型的精确性,应该使用绞合导线的实际模型进行计算。

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	张暕
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关键词 ：输电线路, 覆冰, 碰撞系数, 表面形状

Abstract：Icing on the transmission lines is a physical process in which super-cooled water droplets collide with the conductors and then are trapped.Instead of the real model, the simple one which has a circular section is usually used in the calculation of the collision coefficient, which reduces the accuracy of the calculation.Based on the fluid mechanics, the collision processes between the water droplets and both the real model and the simple model are simulated by the computational fluid dynamics software Fluent and the influences of the conductor surface shape on the velocities of air and droplets, the droplets trajectory, and the collision coefficient are analyzed.The results show firstly that, compared with the simple model, the air velocity of the real model is smaller.Secondly, the real model has a smaller droplets velocity, a more obvious streaming, and a more outward droplets trajectory.Finally, the collision coefficient of the real model is always smaller than that of the simple model.Therefore, the real model should be used in order to ensure the accuracy of the icing model.

Key words： Transmission lines icing collision coefficient surface shape

收稿日期: 2015-05-14 出版日期: 2016-07-15

PACS:

TM726

基金资助:中央高校基本科研业务专项资金(2015XS93)资助项目。

作者简介: 张暕男,1990年生,博士研究生,研究方向为输电线路覆冰及除冰技术。E-mail:keith0808@163.com(通信作者);何青男,1962年生,教授,博士生导师,研究方向为电力设备状态监测与故障诊断。E-mail:hqng@163.com

引用本文:

张暕,何青. 输电线路覆冰时导线表面形状对碰撞系数的影响[J]. 电工技术学报, 2016, 31(13): 209-217. Zhang Jian, He Qing. Influence of Conductor Surface Shape on Collision Coefficient During Transmission Line Icing. Transactions of China Electrotechnical Society, 2016, 31(13): 209-217.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I13/209

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